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学者姓名：吴学震
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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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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.
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, Sunhao , Jiang, Yujing , Zheng, Hanfang et al. Shear characteristics and damage mechanisms of the bolt-grout interface under cyclic shear loading [J]. | COMPUTATIONAL PARTICLE MECHANICS , 2025 . |
| MLA | Zhang, Sunhao et al. "Shear characteristics and damage mechanisms of the bolt-grout interface under cyclic shear loading" . | COMPUTATIONAL PARTICLE MECHANICS (2025) . |
| APA | Zhang, Sunhao , Jiang, Yujing , Zheng, Hanfang , Wu, Xuezhen , Chen, Hongbin . Shear characteristics and damage mechanisms of the bolt-grout interface under cyclic shear loading . | COMPUTATIONAL PARTICLE MECHANICS , 2025 . |
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This study investigates the fracture behaviors and crack propagation characteristics of granite under cyclic loading and unloading. Semi-circular bending (SCB) specimens were subjected to three-point bending tests integrated with acoustic emission (AE) monitoring, 3D scanning, and digital image correlation (DIC) technologies. The experimental protocols included static loading, tiered constant amplitude (TCA) cyclic loading, and variable amplitude (VA) cyclic loading. The results show that cyclic loading significantly influences fracture toughness by modifying the internal microstructure of granite. During cyclic loading and unloading, microcracks repeatedly open and close, leading to a denser microstructure and increased stiffness. 3D scanning analysis revealed that cyclic loading produces rougher and more tortuous fracture surfaces and trajectories as compared to static loading. AE activity under VA cyclic loading indicated the generation of numerous microcracks and the formation of a larger microcrack zone with lower energy release, whereas TCA cyclic loading was characterized by lower-frequency AE signals. This suggests that incomplete unloading and shorter loading durations in TCA conditions deteriorate the intergranular interlocking capacity of mineral grains, promoting intergranular crack formation. DIC analysis demonstrated that VA cyclic loading facilitates microcrack development, resulting in increased microcrack extension lengths and a larger fracture process zone (FPZ) at peak load. Furthermore, the higher ratio of normalized crack mouth opening displacement (CMOD), normalized crack tip opening displacement (CTOD), and displacement jumps during the cyclic loading and unloading process of TCA conditions indicate greater plastic deformation and cumulative damage. This work enhances the understanding of how cyclic load affects rock fracture characteristics and elucidates the mechanisms underlying fatigue failure in granite, providing valuable insights for the design and assessment of rock engineering structures subjected to cyclic stresses. © The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2025.
Keyword ：
Acoustic emission Acoustic emission Crack propagation Crack propagation Cyclic loading and unloading Cyclic loading and unloading Digital image correlation Digital image correlation Fracture surface topography Fracture surface topography
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| GB/T 7714 | Lin, Z. , Xue, F. , Wu, X. et al. Experimental Investigation on Fracture Behaviors and Crack Propagation Characteristics of Granite Under Cyclic Loading and Unloading [J]. | Rock Mechanics and Rock Engineering , 2025 . |
| MLA | Lin, Z. et al. "Experimental Investigation on Fracture Behaviors and Crack Propagation Characteristics of Granite Under Cyclic Loading and Unloading" . | Rock Mechanics and Rock Engineering (2025) . |
| APA | Lin, Z. , Xue, F. , Wu, X. , Zhou, X. . Experimental Investigation on Fracture Behaviors and Crack Propagation Characteristics of Granite Under Cyclic Loading and Unloading . | Rock Mechanics and Rock Engineering , 2025 . |
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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 inner core of traditional stiffened deep mixed piles is typically a prestressed concrete cylinder, relying solely on friction and bonding between the inner and outer cores to transmit load. Field investigations reveal that the bonding force between the soil-cement pile and the tubular pile interface is minimal. When the design is carried out according to specifications, the shear strength of the inner interface is often significantly low. To address this issue, the inner core prestressed concrete cylinder is replaced with a steel pipe pile, and the shear strength of the interfece between the inner core prestressed concrete pipe pile and the outer core cement-soil pile is investigated. Additionally, a steel pipe pile with spiral blades on its outer surface is proposed as a new type of inner core pile. Shear tests on the internal interface were conducted on pile section samples with inner cores of non-ribbed steel pipes and spiral blade steel pipes. The factors influencing the ultimate shear force of the internal interfece were analyzed, and the quantitative data were characterized. The shear failure mode of the inner and outer cores of the new composite pile, along with the evolution law and calculation method of the shear strength parameters of the inner interface, were determined. The shear strength parameters of the inner interfece in the bearing capacity calculation formula of the pile, as specified in the Technical specification for strength composite piles (JG/T 023—2007), were modified. © 2025 Biodiversity Research Center Academia Sinica. All rights reserved.
Keyword ：
Concrete pipe Concrete pipe Cylinders (shapes) Cylinders (shapes) Fracture mechanics Fracture mechanics Pile drivers Pile drivers Pile driving Pile driving Prestressed concrete Prestressed concrete Shear strength Shear strength Soil cement Soil cement Soil testing Soil testing Structural dynamics Structural dynamics
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| GB/T 7714 | Wu, Xue-Zhen , Xia, Ya-Xin , Li, Da-Yong et al. Experiment on shear strength of inner interface of a new type stiffened deep mixed pile [J]. | Rock and Soil Mechanics , 2025 , 46 (2) : 467-478 . |
| MLA | Wu, Xue-Zhen et al. "Experiment on shear strength of inner interface of a new type stiffened deep mixed pile" . | Rock and Soil Mechanics 46 . 2 (2025) : 467-478 . |
| APA | Wu, Xue-Zhen , Xia, Ya-Xin , Li, Da-Yong , You, Xian-Hui , Shan, Ning-Kkang , Xiao, Zhen-Ke et al. Experiment on shear strength of inner interface of a new type stiffened deep mixed pile . | Rock and Soil Mechanics , 2025 , 46 (2) , 467-478 . |
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Thermal stimulation via injecting hot water can assist depressurization in natural gas hydrate (NGH) exploitation. However, whether depressurization coupled with the thermal stimulation (DP + TS) model can enhance gas production in muddy silt NGH reservoirs is still debated. In this study, we aimed to perfect research on the DP + TS model by proposing a hydro-lock effect that can delay pressure propagation and hinder heat and mass transfer in NGH reservoirs. In addition, we established a THMC model to simulate NGH reservoirs located at Site W17 to investigate the production enhancement of the DP + TS model in the initial state and the hydraulic fracturing state. Results indicate that (i) injecting water into reservoirs may cause pressure-holding, NGH reformation, and permeability damage, making the DP + TS model fail to enhance gas recovery and produce additional water. (ii) Hydraulic fracturing enhances permeability, maintaining higher hot water injection rates, easing hydro-lock, and promoting efficient heat and mass transfer. (iii) The DP + TS model can only enhance production when the permeability of the fractured area exceeds a certain value, but its energy efficiency is still lower than that of pure depressurization. These key findings can fill knowledge gaps in the DP + TS model and provide guidance in future NGH exploitation.
Keyword ：
Fracturing Fracturing Hydro-lock effect Hydro-lock effect Muddy silt Muddy silt Natural gas hydrate Natural gas hydrate Thermal stimulation Thermal stimulation
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| GB/T 7714 | Ye, Hongyu , Chen, Jingyu , Yao, Yuanxin et al. Gas recovery from low-permeability muddy silt gas hydrate reservoirs by depressurization coupled with hot water injection: Impact of hydro-lock effect [J]. | ENERGY , 2025 , 316 . |
| MLA | Ye, Hongyu et al. "Gas recovery from low-permeability muddy silt gas hydrate reservoirs by depressurization coupled with hot water injection: Impact of hydro-lock effect" . | ENERGY 316 (2025) . |
| APA | Ye, Hongyu , Chen, Jingyu , Yao, Yuanxin , Chen, Daoyi , Wu, Xuezhen , Li, Dayong et al. Gas recovery from low-permeability muddy silt gas hydrate reservoirs by depressurization coupled with hot water injection: Impact of hydro-lock effect . | ENERGY , 2025 , 316 . |
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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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Jointed rock masses are often subjected to complex cyclic shear loads, which may originate from factors such as earthquakes, mining activities, or traffic. Rock bolts are widely used to enhance the stability of jointed rock masses, and the mechanical behavior and failure characteristics of different types of rock bolts under shear conditions can significantly impact the shear resistance and overall stability of the rock structure. This study analyzed the cyclic shear performance of two types of rock bolts under varying normal stress conditions. The results showed that an increase in normal stress significantly enhanced the peak shear stress and shear resistance of the specimens by compacting the contact interface and increasing friction. However, at higher normal stresses, the contact interface between the rock bolt and the rock mass experienced greater stress concentration, which could lead to early bolt failure. Although fully-grouted rock bolts exhibited strong mechanical interlock and high initial shear strength, they were more prone to brittle fracture due to localized stress concentration, increasing the risk of instability. In contrast, energy-absorbing rock bolts, through mechanisms of plastic deformation and energy absorption, effectively alleviated shear stress concentration and demonstrated better toughness and ductility. As normal stress increased, energy-absorbing rock bolts, with enhanced friction and a larger range of shear displacement, absorbed energy more effectively, resulting in a significant increase in shear energy-far surpassing that of fully grouted bolts, which relied primarily on mechanical interlock. Additionally, with repeated loading cycles, the shear stiffness of energy-absorbing rock bolts showed more gradual and stable degradation compared to fully grouted bolts.
Keyword ：
Cyclic shear Cyclic shear Energy-absorbing bolt Energy-absorbing bolt Fully-grouted bolt Fully-grouted bolt Normal stress Normal stress Shear stiffness Shear stiffness
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| GB/T 7714 | Zheng, Hanfang , Jiang, Yujing , Zhang, Sunhao et al. Comparative study of shear performance of fully-grouted and energy-absorbing bolts under varying normal stress during cyclic shear tests [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2025 , 84 (4) . |
| MLA | Zheng, Hanfang et al. "Comparative study of shear performance of fully-grouted and energy-absorbing bolts under varying normal stress during cyclic shear tests" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 84 . 4 (2025) . |
| APA | Zheng, Hanfang , Jiang, Yujing , Zhang, Sunhao , Wu, Xuezhen , Chen, Hongbin . Comparative study of shear performance of fully-grouted and energy-absorbing bolts under varying normal stress during cyclic shear tests . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2025 , 84 (4) . |
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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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In underground engineering, faults significantly influence the excavation stability, yet the interactive effects of fault structure and stress state on rockburst and failure mechanisms remain poorly understood. This study constructs sandstone specimens with prefabricated straight, serrated, and wavy faults, aiming to clarify how these structures govern surrounding rock mechanics under biaxial and true triaxial compression. By employing synchronized acoustic emission (AE) and digital image correlation (DIC) monitoring, the study characterizes damage evolutions and energy dissipation processes. It is revealed that fault structure and stress state synergistically dictate failure behaviors; concretely, under biaxial stress, straight faults mitigate rockburst by inhibiting the coalescence of opening-orientated tensile cracks, whereas serrated/wavy faults induce complex crack networks that facilitate gradual energy dissipation, reducing abrupt strain release. In contrast, true triaxial compression enhances shear failure mechanism, intensifying rockburst severity and shifting failure from unilateral particle ejection (biaxial) to bilateral, high-frequency debris ejection associated with extensive local instability zones formed by crack coalescence. Acousto-optical data further show that biaxial compression generates tensile-dominated failure, while true triaxial compression shifts the RA-AF distribution towards higher RA values, signaling a transition to shear-enhanced mechanisms. These results highlight the critical roles of fault-stress interactions in controlling energy dissipation and crack development, providing important insights into fault-related instability mechanisms around the excavations under high in-situ stresses. © 2025
Keyword ：
Brittle fracture Brittle fracture Cracks Cracks Ductile fracture Ductile fracture Fracture mechanics Fracture mechanics Image correlation Image correlation Insertion losses Insertion losses Stress analysis Stress analysis Trenching Trenching
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| GB/T 7714 | Zhou, Yi-Jie , Chen, Jia-Yue , Zhang, Ting et al. Highly-stressed excavation instability nearby the fault: An experimental study [J]. | Engineering Fracture Mechanics , 2025 , 324 . |
| MLA | Zhou, Yi-Jie et al. "Highly-stressed excavation instability nearby the fault: An experimental study" . | Engineering Fracture Mechanics 324 (2025) . |
| APA | Zhou, Yi-Jie , Chen, Jia-Yue , Zhang, Ting , Cao, Guan-Sen , Wen, Wen-Fu , Wu, Xue-Zhen et al. Highly-stressed excavation instability nearby the fault: An experimental study . | Engineering Fracture Mechanics , 2025 , 324 . |
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