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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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为探究充填物厚度和锚固结构联合作用对节理岩体剪切特性的影响，开展室内剪切试验和离散元数值模拟研究。首先制备类岩石材料节理试件进行室内剪切试验，结果表明，锚固结构在破坏前可显著提高节理岩体试件的峰值剪应力；随着充填物厚度增大，节理岩体试件的峰值剪应力减小，而锚杆的极限剪切位移会增大。建立不同充填物厚度的锚固充填节理数值模型，通过数值模拟进一步分析法向应力与锚固结构对剪切位移、峰值剪应力、法向位移、细观裂纹的影响。宏观结果表明法向应力越小，法向位移越大即剪胀越明显，且加锚试件的法向位移会高于无锚试样。细观结果则显示出试样的总裂纹数量随法向应力的增大而增大，且加锚试样的总裂纹数量明显高于无锚杆试样。
Keyword ：
充填厚度 充填厚度 剪切试验 剪切试验 微观裂纹 微观裂纹 离散元 离散元 锚杆 锚杆
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| GB/T 7714 | 吴学震 , 郑含芳 , 蒋宇静 et al. 锚固充填节理剪切试验与数值模拟研究 [J]. | 工程地质学报 , 2024 , 32 (05) : 1814-1824 . |
| MLA | 吴学震 et al. "锚固充填节理剪切试验与数值模拟研究" . | 工程地质学报 32 . 05 (2024) : 1814-1824 . |
| APA | 吴学震 , 郑含芳 , 蒋宇静 , 关振长 , 缪圆冰 . 锚固充填节理剪切试验与数值模拟研究 . | 工程地质学报 , 2024 , 32 (05) , 1814-1824 . |
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Rock masses are formed through long-term, complex geological processes, and the presence of joints significantly reduces their strength and increases their deformation. Rock bolts effectively enhance the strength and stability of rock masses and are extensively utilized for reinforcement. According to field investigations, a significant portion of the damage to bolted rock masses stems from shear deformation at joint surfaces. Moreover, roughness affects friction and surface contact, thus influencing the shear behavior between rock and rock bolts. This study considers two crucial factors affecting the shear characteristics of bolted rock joints: joint surface roughness and normal stress. Using the Particle Flow Code discrete element numerical method, the Barton standard joint profile lines were input to establish numerical models of both unbolted and bolted rock joints for direct shear tests. Results reveal that the peak shear stress and stiffness of both unbolted and bolted rock joints increase with rising normal stress and joint roughness coefficient. The peak shear stress and stiffness of bolted rock joints are notably higher than those of unbolted ones, with a maximum increase of 17.5%. Crack development in bolted rock joints occurs in stages of rapid, slow, and stable development, whereas no distinct slow development stage is observed in unbolted rock joints. Additionally, micro cracks in both unbolted and bolted rock joints are primarily tensile cracks, originating around the joint surface and extending outward with increasing shear displacement. These findings offer valuable insights into the microscopic shear mechanics of bolted rock joints and provide practical references for engineering design and applications in rock reinforcement projects.
Keyword ：
joint roughness coefficient joint roughness coefficient mining engineering mining engineering numerical simulation numerical simulation rock bolts rock bolts rock joints rock joints
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| GB/T 7714 | Wang, Zhiyong , Liao, Liyun , Guo, Shiyi et al. Numerical investigation of bolted rock joints under varying normal stress and joint roughness coefficient conditions [J]. | FRONTIERS IN EARTH SCIENCE , 2024 , 12 . |
| MLA | Wang, Zhiyong et al. "Numerical investigation of bolted rock joints under varying normal stress and joint roughness coefficient conditions" . | FRONTIERS IN EARTH SCIENCE 12 (2024) . |
| APA | Wang, Zhiyong , Liao, Liyun , Guo, Shiyi , Zheng, Hanfang , Wu, Xuezhen . Numerical investigation of bolted rock joints under varying normal stress and joint roughness coefficient conditions . | FRONTIERS IN EARTH SCIENCE , 2024 , 12 . |
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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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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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Abstract ：
High stress in surrounding rock will lead to serious problems, e.g., rock burst in hard rock and large deformation 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 performing large constant resistance and controllable deformation to effectively control the unpredictable disasters such as large deformation in soft rock and rock burst in hard rock encountered in deep strata. © 2024
Keyword ：
Energy-absorbing cable Energy-absorbing cable Lab test Lab test Load capacity Load capacity Numerical simulation Numerical simulation Ultimate displacement Ultimate displacement
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| GB/T 7714 | Wu, X. , Zhao, M. , Ye, Q. et al. A new deformable cable for rock support in high stress tunnel: Steel pipe shrinkable energy-absorbing cable [J]. | International Journal of Mining Science and Technology , 2024 , 34 (8) : 1083-1093 . |
| MLA | Wu, X. et al. "A new deformable cable for rock support in high stress tunnel: Steel pipe shrinkable energy-absorbing cable" . | International Journal of Mining Science and Technology 34 . 8 (2024) : 1083-1093 . |
| APA | Wu, X. , Zhao, M. , Ye, Q. , Jiang, Y. , Deng, T. , Zheng, H. et al. A new deformable cable for rock support in high stress tunnel: Steel pipe shrinkable energy-absorbing cable . | International Journal of Mining Science and Technology , 2024 , 34 (8) , 1083-1093 . |
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Multilateral horizontal wells (MHW) can enhance gas production by expanding the natural gas hydrate (NGH) decomposition area, but inevitably leading to larger changes in reservoir pressure and rock stresses, causing subsidence or disasters. Therefore, this study established a THMC model that evaluated the production effect and geomechanical response of MHW in Class-I reservoirs with different permeability and proposed a CO2 reinjection repair strategy to achieve subsidence recovery and carbon storage. Results indicate that MHW with vertical branch arrangements performs best in short-term production for low-permeability reservoirs, while the temperature and pressure evolution in high-permeability reservoirs is more drastic than in low-permeability reservoirs, producing many unfavorable factors. Higher capacity also results in larger strata subsidence and stress changes, affecting the reservoir stability and wellbore safety: (i) subsidence occurs mainly in the NGH sediment and the upper zone of the wellbore; (ii) normal stresses around the wellbore increase most significantly in the vertical direction, while shear stresses generally decrease. The repair indicators of subsidence recovery rate, energy recovery rate, and hydrate conversion rate suggest that reinjecting CO2 into depleted NGH reservoirs can improve the mechanical properties of the strata and achieve carbon storage via the hydrate method as well.
Keyword ：
CO 2 reinjection CO 2 reinjection Multilateral horizontal well Multilateral horizontal well Natural gas hydrate Natural gas hydrate Reservoir repair Reservoir repair Reservoir subsidence Reservoir subsidence THMC model THMC model
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| GB/T 7714 | Ye, Hongyu , Chen, Daoyi , Yao, Yuanxin et al. Exploration of production capacity-geomechanical evaluation and CO 2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells [J]. | ENERGY , 2024 , 296 . |
| MLA | Ye, Hongyu et al. "Exploration of production capacity-geomechanical evaluation and CO 2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells" . | ENERGY 296 (2024) . |
| APA | Ye, Hongyu , Chen, Daoyi , Yao, Yuanxin , Wu, Xuezhen , Li, Dayong , Zi, Mucong . Exploration of production capacity-geomechanical evaluation and CO 2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells . | ENERGY , 2024 , 296 . |
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Available studies indicate that a multi-branch vertical well (MVW) may be the most appropriate well type for natural gas hydrate (NGH) exploitation, and the effect of branch parameters on gas production has been extensively explored. However, there is still a lack of systematic research and organization on how reservoir properties like reservoir types, porosity, and thickness affect gas production indexes. Consequently, we established Class 1-3 reservoir models and designed a series of cases to analyze the effect of reservoir properties on the exploitation with MVW. Results indicate that (i) MVW may be suitable for short-term production in Class 1 and Class 2 reservoirs and long-term production in the Class 3 reservoir, and the main well of MVW accounts for about 19% of gas production. (ii) It is preferable to locate the branches as close to the top of the reservoir as possible while maintaining reasonable spacing to capture the dissociated gas escaping from the lower reservoir. In addition, in Class 1 reservoirs, branches below the main well can capture free gas in the mixed layer. (iii) Reservoir parameters, including saturation, porosity, permeability, and thickness, make a significant difference in gas production, which provides an essential basis for further research by correlation analysis and polynomial fitting.
Keyword ：
Class 1-3 Class 1-3 Depressurization Depressurization Multi-branch vertical well Multi-branch vertical well Natural gas hydrate Natural gas hydrate Reservoir properties Reservoir properties
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| GB/T 7714 | Ye, Hongyu , Chen, Daoyi , Wu, Xuezhen et al. Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China [J]. | GAS SCIENCE AND ENGINEERING , 2024 , 122 . |
| MLA | Ye, Hongyu et al. "Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China" . | GAS SCIENCE AND ENGINEERING 122 (2024) . |
| APA | Ye, Hongyu , Chen, Daoyi , Wu, Xuezhen , Li, Dayong , Yu, Yisong , Zi, Mucong . Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China . | GAS SCIENCE AND ENGINEERING , 2024 , 122 . |
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Abstract ：
深部岩体非线性大变形特性引发的岩爆灾害一直是岩土工程的世界性难题，严重制约了工程建设的施工进度和工程安全，加强对岩爆防治措施的深入研究刻不容缓。基于钢管挤压变形原理，提出了一种新型的缩管式恒阻大变形锚杆，该种锚杆可在容许较大的变形量的同时提供较高的恒阻力。在前期研究的基础上，通过落锤冲击试验探索了缩管式恒阻大变形锚杆的抗冲击性能。试验结果表明：在整个冲击过程中，缩管式恒阻大变形锚杆的工作阻力稳定在150～180 kN范围内，恒阻特性显著；缩管式恒阻大变形锚杆吸收能量大、效率高，单次可吸收冲击能量53 kJ；在冲击过程中，试件压缩率仅减小了0.54%～1.43%，变形情况较为稳定。缩管式恒阻大变形锚杆具有良好的抗冲击特能，可为地下工程建设过程中岩爆灾害的治理提供有力的技术支撑。
Keyword ：
岩爆 岩爆 恒阻力 恒阻力 抗冲击特性 抗冲击特性 缩管式恒阻大变形锚杆 缩管式恒阻大变形锚杆 落锤冲击试验 落锤冲击试验
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| GB/T 7714 | 赵明珠 , 吴学震 , 叶青 et al. 缩管式恒阻大变形锚杆抗冲击特性及其治理岩爆潜力研究 [J]. | 岩土力学 , 2024 , (11) . |
| MLA | 赵明珠 et al. "缩管式恒阻大变形锚杆抗冲击特性及其治理岩爆潜力研究" . | 岩土力学 11 (2024) . |
| APA | 赵明珠 , 吴学震 , 叶青 , 王刚 , 蒋宇静 , 邓涛 . 缩管式恒阻大变形锚杆抗冲击特性及其治理岩爆潜力研究 . | 岩土力学 , 2024 , (11) . |
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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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