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学者姓名：吴学震
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Abstract ：
传统劲性水泥土复合桩的内芯多采用预应力混凝土管桩,其仅依靠内外芯的摩擦和黏结来传递荷载.现场调研发现,水泥土桩与管桩界面的胶结力较小,依据规范进行设计时,内界面抗剪强度往往取值很低.针对此种情况,将内芯预应力混凝土管桩替换为钢管桩,探寻其与外芯水泥土桩间界面的抗剪强度,同时又提出将外表面具有螺旋叶片的钢管桩作为新型内芯桩.针对内芯为无肋钢管及螺旋叶片钢管的桩段试样进行了内界面剪切试验,分析了内界面极限剪切力的影响因素并进行了定量数据表征.获得了新型组合桩的内外芯剪切破坏模式及内界面抗剪强度参数的演化规律和计算方法,从而对《劲性复合桩技术规程》(JG/T 023-2007)桩体承载力计算公式中的内界面抗剪强度参数取值进行了修正.
Keyword ：
内界面抗剪强度 内界面抗剪强度 劲性水泥土复合桩 劲性水泥土复合桩 模型试验 模型试验 螺旋叶片 螺旋叶片 规范参数修正 规范参数修正 钢管桩 钢管桩
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| GB/T 7714 | 吴学震 , 夏亚歆 , 李大勇 et al. 新型劲性水泥土组合桩内界面抗剪强度试验研究 [J]. | 岩土力学 , 2025 , 46 (2) : 467-478 . |
| MLA | 吴学震 et al. "新型劲性水泥土组合桩内界面抗剪强度试验研究" . | 岩土力学 46 . 2 (2025) : 467-478 . |
| APA | 吴学震 , 夏亚歆 , 李大勇 , 游先辉 , 单宁康 , 肖贞科 et al. 新型劲性水泥土组合桩内界面抗剪强度试验研究 . | 岩土力学 , 2025 , 46 (2) , 467-478 . |
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Depressurization production causes reservoir deformation to change the physical and mechanical properties, thus affecting the fluid flow and production performance. The mechanical deformation and gas production characteristics of multilayer hydrate reservoir at the first depressurization production site in the Shenhu area need to be further simulated and investigated. In this paper, a multilayer hydrate reservoir model is established based on the real logging data of SHSC-4 well, and the simulation results are compared with the test production results to verify the model validity. The production performance and reservoir stability are evaluated by considering reservoir deformation and gas production behavior, and the CO2 reinjection potential of the multilayer reservoir after production is analyzed by numerical methods. Low production pressure can serve to increase cumulative gas production, but reservoir deformation can also be an unfavorable factor hindering gas production. The negative effects of reservoir deformation caused by depressurization on gas production results need to be considered when numerical methods are used to evaluate reservoir production performance or optimize production design. Percentage contribution of free gas layer (FGL) decreases with the reduction of production pressure, and the gas production from the reservoir is mainly from hydrate-bearing layer (HBL) and three phase layer (TPL). There is a turning point in the production performance of HBL and TPL around 3 MPa. The gas production performance of HBL is better than TPL when the production pressure is lower than 3 MPa, and the percentage contribution of HBL and TPL are about 40% under different initial inherent permeability conditions. Permeability enhancement measures promote the propagation of low pore pressure in the reservoir, which is prone to cause large reservoir deformation. CO2 reinjection leads to reservoir uplift around production well, and stress concentration distribution induced by depressurization production are mitigated. TPL has better CO2 reinjection potential than FGL and HBL, and it accounts for about 50% of the total reinjected gas.
Keyword ：
Depressurization production Depressurization production Gas production Gas production Natural gas hydrate Natural gas hydrate Numerical investigation Numerical investigation Reservoir deformation Reservoir deformation
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| GB/T 7714 | Ma, Xianzhuang , Luan, Hengjie , Jiang, Yujing et al. Numerical investigation on hydrate reservoir deformation induced by depressurization production and analysis of CO2 reinjection potential [J]. | GEOENERGY SCIENCE AND ENGINEERING , 2025 , 247 . |
| MLA | Ma, Xianzhuang et al. "Numerical investigation on hydrate reservoir deformation induced by depressurization production and analysis of CO2 reinjection potential" . | GEOENERGY SCIENCE AND ENGINEERING 247 (2025) . |
| APA | Ma, Xianzhuang , Luan, Hengjie , Jiang, Yujing , Yan, Peng , Wu, Xuezhen , Wang, Changsheng et al. Numerical investigation on hydrate reservoir deformation induced by depressurization production and analysis of CO2 reinjection potential . | GEOENERGY SCIENCE AND ENGINEERING , 2025 , 247 . |
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Understanding brittle failure and accurately assessing brittleness, especially in rocks, are crucial for engineering failure analysis. This study proposes a novel method for evaluating rock brittleness by considering the evolution of the energy difference before and after the peak between ideal elastic-brittle materials and real rock materials. The performance of the proposed brittleness index is validated through uniaxial, conventional triaxial, and true triaxial ejection tests. Observations from true triaxial ejection tests reveal an inverse relationship between the novel brittleness index value and rock brittleness, with lower index values corresponding to higher brittleness and greater ejection kinetic energy. A strong positive correlation is evident between rock brittleness and its ejection kinetic energy. Furthermore, the proposed index demonstrates heightened sensitivity to rock brittleness variations compared to existing indices, as shown by comparative analysis across diverse stress states and rock types. Notably, in conventional triaxial compression tests, the novel brittleness index exhibits superior regularity and consistency in capturing the decrease in rock brittleness with increasing confining pressure. This research contributes valuable insights for the analysis and evaluation of brittle failure processes in rocks.
Keyword ：
Brittleness evaluation Brittleness evaluation Energy evolution Energy evolution Ideal elastic-brittle Ideal elastic-brittle Kinetic energy Kinetic energy Rock ejection Rock ejection True triaxial True triaxial
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| GB/T 7714 | Chen, Guoqing , Zhang, Yan , Xu, Qiang et al. A novel brittle evaluation method considering the difference in energy evolution during rock failure process [J]. | ENGINEERING FAILURE ANALYSIS , 2025 , 170 . |
| MLA | Chen, Guoqing et al. "A novel brittle evaluation method considering the difference in energy evolution during rock failure process" . | ENGINEERING FAILURE ANALYSIS 170 (2025) . |
| APA | Chen, Guoqing , Zhang, Yan , Xu, Qiang , Wu, Xuezhen , Meng, Kai , Fan, Hongzhuo . A novel brittle evaluation method considering the difference in energy evolution during rock failure process . | ENGINEERING FAILURE ANALYSIS , 2025 , 170 . |
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To investigate the mechanical behaviour and failure mechanism of flawed rock masses under biaxial stress conditions, a series of biaxial compression experiments are conducted on red sandstone specimens containing combined flaws of the circular hole and perforated symmetric fissure combined with acoustic emission (AE) technology in this work. The results show a close association between the stress-strain curve morphology and confining stress, both the biaxial compression strength and elastic modulus exhibit an upward trend with increasing fissure angle and confining stress. The maximum AE energy and cumulative AE energy both increase with higher confining stress. The crack types in the specimens are identified by analyzing the average frequency/rise time/amplitude value distribution, revealing a gradual decrease in the percentage of tensile cracks with increasing fissure angle. An AE localization algorithm based on the least absolute value method is applied to pinpoint AE events during biaxial compression, and AE events distribution is analyzed through the kernel density estimation. The crack extension behaviour is described based on the movement of the maximum kernel density points, which initially exhibits a progression from both ends of the specimen toward the central region and subsequently from the central fissure tip toward the two ends.
Keyword ：
acoustic emission acoustic emission biaxial compression test biaxial compression test confining stress confining stress flawed rock masses flawed rock masses
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| GB/T 7714 | Liu, Tingfang , Wang, Gang , Wang, Changsheng et al. Experimental study on mechanical and acoustic emission characteristics of red sandstone containing combined flaws of hole-fissure under biaxial compression [J]. | CANADIAN GEOTECHNICAL JOURNAL , 2025 , 62 . |
| MLA | Liu, Tingfang et al. "Experimental study on mechanical and acoustic emission characteristics of red sandstone containing combined flaws of hole-fissure under biaxial compression" . | CANADIAN GEOTECHNICAL JOURNAL 62 (2025) . |
| APA | Liu, Tingfang , Wang, Gang , Wang, Changsheng , Wu, Xuezhen , Chen, Junhao , Zhang, Houquan et al. Experimental study on mechanical and acoustic emission characteristics of red sandstone containing combined flaws of hole-fissure under biaxial compression . | CANADIAN GEOTECHNICAL JOURNAL , 2025 , 62 . |
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The rock bolt–grout interface (BGI) represents the weakest link in anchorage systems. Under cyclic loading, continuous slip and closure at the interface lead to degradation of its load-bearing capacity and fatigue damage. To investigate the fatigue shear behavior of the BGI, laboratory shear tests were conducted to provide a basis for calibrating the mechanical parameters in simulations. Subsequently, a series of numerical simulations of cyclic shear on the BGI were performed. The number of cracks increased in a stepwise manner over time, initially concentrated on the left side of the BGI and then gradually extending to the right, ultimately resulting in through-cracks. High frequency, high amplitude, and high stress levels accelerated crack extension, weakening the bonding strength at the BGI. The introduction of irreversible strain for a quantitative analysis of the fatigue process revealed that increases in frequency, amplitude, and maximum shear stress levels significantly accelerated damage accumulation and shortened fatigue life. Additionally, the direct shear test with an amplitude of 0 revealed creep characteristics, with initial shear displacement increasing steadily before accelerating due to damage accumulation. Fitting analysis indicated that increases in frequency, amplitude, and maximum shear stress level significantly raised the initial shear displacement and accelerated its growth rate. © The Author(s) under exclusive licence to OWZ 2025.
Keyword ：
Bolt–grout interface Bolt–grout interface Cyclic loading Cyclic loading Damage mechanisms Damage mechanisms Numerical simulation Numerical simulation Shear characteristics Shear characteristics
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| GB/T 7714 | Zhang, S. , Jiang, Y. , Zheng, H. et al. Shear characteristics and damage mechanisms of the bolt–grout interface under cyclic shear loading [J]. | Computational Particle Mechanics , 2025 . |
| MLA | Zhang, S. et al. "Shear characteristics and damage mechanisms of the bolt–grout interface under cyclic shear loading" . | Computational Particle Mechanics (2025) . |
| APA | Zhang, S. , Jiang, Y. , Zheng, H. , Wu, X. , Chen, H. . Shear characteristics and damage mechanisms of the bolt–grout interface under cyclic shear loading . | Computational Particle Mechanics , 2025 . |
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The logging results from the Shenhu Sea show that the P-T conditions of NGH deposits are below the CO2 hydrate phase equilibrium curve. The burial depth difference between the CO2 hydrate stable zone and NGH deposits is usually above 100 m, which differs from the laboratory scale. Thus, whether CO2 hydrate caps can provide pore sealing and reinforcement of natural gas hydrate (NGH) overburden at the engineering scale is unknown. Based on this, we aimed to perfect research on the CO2 hydrate cap, including its formation process, effects on NGH exploitation, geomechanical response, and comprehensive benefit evaluation, by establishing a THMC model based on Site W17. Results indicate that (i) CO2 can form hydrates in the overburden layer with a conversion rate of about 28%, preventing the upward escape of residual liquid CO2 due to density difference. (ii) CO2 injection and CO2 hydrate cap formation can increase the decomposition driving force during depressurization to enhance production, but it fails to inhibit water invasion from the upper part of the NGH deposit due to the excessive depth difference. (iii) The CO2 hydrate cap causes strata uplift, thereby mitigating strata subsidence during depressurization production, especially for the cases of horizontal wells, where the subsidence is reduced by about 103.4%. (iv) Injecting too much CO2 may not benefit gas production, where part of the free gas will convert into NGH due to pressure rise. The optimal injection rate in this study is 40,000 m3/d. (v) Indicators like CO2 hydrate conversion rate, gas-water ratio, and maximum strata displacement show that horizontal well systems with CO2 hydrate caps are more beneficial than vertical well systems, and multi-branched well systems are more beneficial than single-direction well systems. These key findings may differ from the laboratory scale, which can provide a reference for applying CO2 hydrate caps in actual NGH exploitation. © 2024 Elsevier Ltd
Keyword ：
Horizontal wells Horizontal wells Hydrates Hydrates Injection (oil wells) Injection (oil wells) Natural gas well logging Natural gas well logging Natural gas well production Natural gas well production Natural gas wells Natural gas wells Petroleum reservoir evaluation Petroleum reservoir evaluation
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| GB/T 7714 | Ye, Hongyu , Yao, Yuanxin , Chen, Daoyi et al. How shallow CO2 hydrate cap affects depressurization production in deeper natural gas hydrate reservoirs: An example at Site W17, South China Sea [J]. | Journal of Cleaner Production , 2024 , 478 . |
| MLA | Ye, Hongyu et al. "How shallow CO2 hydrate cap affects depressurization production in deeper natural gas hydrate reservoirs: An example at Site W17, South China Sea" . | Journal of Cleaner Production 478 (2024) . |
| APA | Ye, Hongyu , Yao, Yuanxin , Chen, Daoyi , Chen, Jingyu , Wu, Xuezhen , Li, Dayong et al. How shallow CO2 hydrate cap affects depressurization production in deeper natural gas hydrate reservoirs: An example at Site W17, South China Sea . | Journal of Cleaner Production , 2024 , 478 . |
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In geotechnical engineering, activities such as landslides, rockfalls, blasting, and excavation often subject jointed rock masses to dynamic shear loads, impacting project stability. With continuous innovation of anchoring support technology, the appearance of energy-absorbing bolts has provided more options for rock support. This study selected fully-grouted bolts and energy-absorbing bolts, considering the roughness of natural rock joints. Indoor shear tests were conducted on bolted specimens at varying shear velocities. A comprehensive analysis was conducted on the failure morphology of joint surfaces and the fracture characteristics of bolts. Subsequently, the shear performance of both bolt types was quantitatively assessed through absorbed shear energy. At the interface between fully-grouted bolts and joint surfaces, stress concentration phenomena were observed. In contrast, energy-absorbing bolts exhibited significant necking phenomena. Under external forces, the bolt body detached from the grout, enabling it to accommodate large deformations of the rock mass and absorb energy. The results indicate that energy-absorbing bolts demonstrate better adaptability and energy absorption capacity under high-velocity shearing, while fully-grouted bolts exhibit higher peak shear stresses. Based on the experimental findings, for projects requiring consideration of dynamic shear loads and energy absorption capabilities, energy-absorbing bolts may be more suitable, providing additional safety assurance. Conversely, fully-grouted bolts may be more appropriate for applications with higher requirements for shear resistance, such as structural support under general static loads. © 2024
Keyword ：
Energy-absorbing bolt Energy-absorbing bolt Fully-grouted bolt Fully-grouted bolt Rock joints Rock joints Shear energy Shear energy Shear velocity Shear velocity
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| GB/T 7714 | Zheng, H. , Wu, X. , Jiang, Y. et al. Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts [J]. | International Journal of Rock Mechanics and Mining Sciences , 2024 , 183 . |
| MLA | Zheng, H. et al. "Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts" . | International Journal of Rock Mechanics and Mining Sciences 183 (2024) . |
| APA | Zheng, H. , Wu, X. , Jiang, Y. , Wang, G. , Li, B. . Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts . | International Journal of Rock Mechanics and Mining Sciences , 2024 , 183 . |
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Sediment compression during submarine hydrate depressurization production causes changes in physical and mechanical characteristics, which in turn affects production results. In this paper, based on geological conditions of SHSC-4 well in Shenhu area, a theoretical model considering sediment compression effects is established by COMSOL, and the effects on the evolution of reservoir physical and mechanical characteristics within 60 days during depressurization production is simulated. The results show that model dimension effects can be ignored when the size l >= 100 m within 60 days. The effects of sediment compression on the physical characteristics of the reservoir are mainly realized by affecting the evolution of porosity, and the porosity reduction leads to permeability reduction. The larger the sediment compression coefficient, the higher the pore pressure in the reservoir. Sediment compression hinders the propagation of low pore pressure and heat transfer in the reservoir, which is unfavorable for hydrate decomposition favorable to hydrate reformation. A larger or smaller sediment compression coefficient selected in the simulation can lead to under- or over-estimate of reservoir gas production, so choosing an appropriate sediment compression coefficient when considering sediment compression is necessary for rational assessment of reservoir production behavior. In the production test site, when the production pressure is higher than 3 MPa, the pore pressure gradient is the key factor to promote gas production from the reservoir. When the production pressure is lower than 3 MPa, the sediment compression is the key factor to impede gas production from the reservoir.
Keyword ：
Depressurization production Depressurization production Natural gas hydrate Natural gas hydrate Numerical simulation Numerical simulation Physical and mechanical characteristics Physical and mechanical characteristics Sediment compression effects Sediment compression effects
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| GB/T 7714 | Jiang, Yujing , Ma, Xianzhuang , Luan, Hengjie et al. Numerical simulation on natural gas hydrate depressurization production considering sediment compression effects [J]. | ENERGY , 2024 , 301 . |
| MLA | Jiang, Yujing et al. "Numerical simulation on natural gas hydrate depressurization production considering sediment compression effects" . | ENERGY 301 (2024) . |
| APA | Jiang, Yujing , Ma, Xianzhuang , Luan, Hengjie , Wu, Xuezhen , Wang, Changsheng , Shan, Qinglin et al. Numerical simulation on natural gas hydrate depressurization production considering sediment compression effects . | ENERGY , 2024 , 301 . |
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In geotechnical engineering, activities such as landslides, rockfalls, blasting, and excavation often subject jointed rock masses to dynamic shear loads, impacting project stability. With continuous innovation of anchoring support technology, the appearance of energy-absorbing bolts has provided more options for rock support. This study selected fully-grouted bolts and energy-absorbing bolts, considering the roughness of natural rock joints. Indoor shear tests were conducted on bolted specimens at varying shear velocities. A comprehensive analysis was conducted on the failure morphology of joint surfaces and the fracture characteristics of bolts. Subsequently, the shear performance of both bolt types was quantitatively assessed through absorbed shear energy. At the interface between fully-grouted bolts and joint surfaces, stress concentration phenomena were observed. In contrast, energy-absorbing bolts exhibited significant necking phenomena. Under external forces, the bolt body detached from the grout, enabling it to accommodate large deformations of the rock mass and absorb energy. The results indicate that energy-absorbing bolts demonstrate better adaptability and energy absorption capacity under highvelocity shearing, while fully-grouted bolts exhibit higher peak shear stresses. Based on the experimental findings, for projects requiring consideration of dynamic shear loads and energy absorption capabilities, energyabsorbing bolts may be more suitable, providing additional safety assurance. Conversely, fully-grouted bolts may be more appropriate for applications with higher requirements for shear resistance, such as structural support under general static loads.
Keyword ：
Energy-absorbing bolt Energy-absorbing bolt Fully-grouted bolt Fully-grouted bolt Rock joints Rock joints Shear energy Shear energy Shear velocity Shear velocity
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| GB/T 7714 | Zheng, Hanfang , Wu, Xuezhen , Jiang, Yujing et al. Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2024 , 183 . |
| MLA | Zheng, Hanfang et al. "Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 183 (2024) . |
| APA | Zheng, Hanfang , Wu, Xuezhen , Jiang, Yujing , Wang, Gang , Li, Bo . Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2024 , 183 . |
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High stress in surrounding rock will lead to serious problems,e.g.,rock burst in hard rock and large defor-mation in soft rock.The applied support system under high in-situ stress conditions should be able to carry high load and also accommodate large deformation without experiencing severe damage.In this paper,a specially designed energy-absorbing component for rock bolt and cable that can solve the above problems was proposed.The energy-absorbing component can provide support resistance by plastic deformation of the metal including constraint annulus and compression pipe.For practical engineering,two forms were proposed.One was installed in the surrounding rock by reaming,and the other was installed directly outside the surrounding rock.During the dilation of the surrounding rock,the relative displacement of constraint annulus and compression pipe occurs,resulting in deformation resistance.Deformation resistance is transmitted to the rock bolt or cable,providing support resistance.The lab test and numerical simulation showed that the energy-absorbing component can perfectly achieve the large deformation effect,the deformation amount is as high as 694 mm,and the bearing capacity is stable at 367 kN.The field application tests were carried out in the mining roadway of Xinjulong coal mine,and the results showed that the new type of cable can ensure itself not to break under the condition of large deformation of the surrounding rock.The energy-absorbing component has the superiorities of perform-ing large constant resistance and controllable deformation to effectively control the unpredictable disas-ters such as large deformation in soft rock and rock burst in hard rock encountered in deep strata.
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| GB/T 7714 | Xuezhen Wu , Mingzhu Zhao , Qing Ye et al. A new deformable cable for rock support in high stress tunnel:Steel pipe shrinkable energy-absorbing cable [J]. | 矿业科学技术学报（英文版） , 2024 , 34 (8) : 1083-1093 . |
| MLA | Xuezhen Wu et al. "A new deformable cable for rock support in high stress tunnel:Steel pipe shrinkable energy-absorbing cable" . | 矿业科学技术学报（英文版） 34 . 8 (2024) : 1083-1093 . |
| APA | Xuezhen Wu , Mingzhu Zhao , Qing Ye , Yujing Jiang , Tao Deng , Hanfang Zheng et al. A new deformable cable for rock support in high stress tunnel:Steel pipe shrinkable energy-absorbing cable . | 矿业科学技术学报（英文版） , 2024 , 34 (8) , 1083-1093 . |
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