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学者姓名：郑路
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通过物理试验研究了节理影响下的滚石碰撞破碎规律,并在室内碰撞试验的基础上,采用非连续变形分析(discontinuous deformation analysis,简称DDA)并行计算方法对滚石冲击-碰撞-破碎过程进行数值模拟.主要探讨节理和坡面的夹角β、节理的连通率k和滚石的冲击速度V对滚石破碎特征的影响.采用滚石表面积与初始滚石表面积之比η,作为定量描述滚石破碎程度的量值,η值越大,破碎程度越高.通过研究发现:(1)η随k的增大而增大;在较大速度冲击条件下时,k=0.75时的η值是k=0.25时的1.2倍;(2)k=0.25时,η随β的变化不大,当k=0.50和0.75时,η随β的增加而减小;(3)高速冲击下(6.8～7.4m/s)的η相对于低速条件(3.5～4.5 m/s)的η提升了 1.5倍;(4)随着滚石单节理连通率k从0增大到0.75,能量恢复系数呈现逐渐减小的趋势,其数值降低了 1.6～1.9倍;(5)随着撞击速度的增加,滚石的能量恢复系数随节理夹角β的增加而逐渐增大,最大可达1.6倍.(6)数值模拟与室内碰撞试验得到的破裂特征和破碎程度基本相同,单节理连通率和节理与坡面夹角的扩大影响了应力的传播,改变了试件破裂特征.(7)多节理滚石撞击破碎时,裂缝不沿节理设置轮廓延伸,不与远离岩石中心的节理相交.撞击后的碎片速度略低于撞击前的速度.本研究对揭示滚石原生节理影响下的碰撞破碎具有一定的参考意义.
Keyword ：
原生节理 原生节理 滚石灾害 滚石灾害 物理试验 物理试验 碰撞破碎 碰撞破碎 能量恢复系数 能量恢复系数
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| GB/T 7714 | 郑路 , 陈元睿 , 吴怡涵 et al. 节理影响下的滚石碰撞破碎规律研究 [J]. | 岩土力学 , 2025 , 46 (3) : 729-749 . |
| MLA | 郑路 et al. "节理影响下的滚石碰撞破碎规律研究" . | 岩土力学 46 . 3 (2025) : 729-749 . |
| APA | 郑路 , 陈元睿 , 吴怡涵 , 张学略 , 毕钰璋 . 节理影响下的滚石碰撞破碎规律研究 . | 岩土力学 , 2025 , 46 (3) , 729-749 . |
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The lateral displacement of deep soft soil caused by large-area heap loading is a common issue in engineering practice, which affects the stability of neighboring pile foundations. This study investigates the calculation of thrust force exerted by the flow of soft soil around piles and its impact on pile foundations. The surrounding soft soil is considered a Bingham fluid. An analytical formula for single pile flow drag during the internal slip of deep soft soil is derived based on fluid mechanics theory and the fluid characteristics of the Bingham fluid. The traditional cantilever pile approach is modified by assuming a rectangular distribution of flow drag along the pile body and using the matrix transfer method. The response of a single pile body under field heap loading conditions is then analyzed, and the results are compared with the calculation results of the traditional soil pressure method and field-measured data to validate the proposed calculation method for flow drag around a pile in soft soil. Finally, a parametric study is conducted to analyze the effects of the relative flow velocity and dynamic viscous coefficient of soft soil on flow drag.
Keyword ：
Bingham fluid Bingham fluid Flow drag Flow drag Large-area heap loading Large-area heap loading Pile Pile Soft soil Soft soil
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| GB/T 7714 | Wu, Min , Zheng, Jiayong , Liu, Qijian et al. Calculation method of flow drag around a pile in soft soil considering Bingham fluid properties and analysis of single pile response [J]. | OCEAN ENGINEERING , 2025 , 317 . |
| MLA | Wu, Min et al. "Calculation method of flow drag around a pile in soft soil considering Bingham fluid properties and analysis of single pile response" . | OCEAN ENGINEERING 317 (2025) . |
| APA | Wu, Min , Zheng, Jiayong , Liu, Qijian , Zheng, Lu , Deng, Tao . Calculation method of flow drag around a pile in soft soil considering Bingham fluid properties and analysis of single pile response . | OCEAN ENGINEERING , 2025 , 317 . |
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Sudden freefall is very common in high-velocity and long-runout rockslides. The combination of freefall and joints (a rock mass structure) may cause a high degree of fragmentation of sliding rock mass. However, previous studies often simplified fragmentation of rock mass with initial joints to be caused by impact after sliding, ignoring the contribution of freefall to rockslide fragmentation and spreading. Several multi-stage slope models are created in this study referring to the topographic characteristics of rockslides, including impact after sliding, inter-slope freefall, once-end-slope freefall, and twice-end-slope freefall. The rock masses are simulated by setting different numbers of persistent joints in analog blocks. The joints are described by the unbonded particles. The results suggest that the fragmentation of analog blocks consists of the fracture caused by tensile cracks and the local fragmentation caused by impact. Fragmentation is an effective sink, which shortens the runout distance of the center of the mass. Freefall and initial joints limit the momentum transfer between the front and rear fragments, so the freefall cannot directly promote rockslide spreading. However, freefall and initial joints facilitate the fragmentation of the block, producing a high sphericity of fragments, which are easy to roll and bounce under the disturbance of the freefall. This might be an important reason for the long-runout spreading of rockslides. © The Author(s) 2024.
Keyword ：
Landslides Landslides Rock bursts Rock bursts Rock mechanics Rock mechanics Rocks Rocks
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| GB/T 7714 | Zhu, Zhiyuan , Wu, Yihan , Bi, Yuzhang et al. Contribution of freefall and rock mass structure to post-fragmentation spreading of rockslides [J]. | Bulletin of Engineering Geology and the Environment , 2024 , 83 (8) . |
| MLA | Zhu, Zhiyuan et al. "Contribution of freefall and rock mass structure to post-fragmentation spreading of rockslides" . | Bulletin of Engineering Geology and the Environment 83 . 8 (2024) . |
| APA | Zhu, Zhiyuan , Wu, Yihan , Bi, Yuzhang , Zheng, Lu , Chen, Fei , Wu, Wei et al. Contribution of freefall and rock mass structure to post-fragmentation spreading of rockslides . | Bulletin of Engineering Geology and the Environment , 2024 , 83 (8) . |
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The baffle effectively slowed down debris flow velocity, reduced its kinetic energy, and significantly shortened the distance of debris flow movement. Consequently, they are widely used for protection against natural hazards such as landslides and mudslides. This study, based on the three-dimensional DEM (Discrete Element Method), investigated the impact of different baffle positions on debris flow protection. Debris flow velocity and kinetic energy variations were studied through single-factor experiments. Suitable baffle positions were preliminarily selected by analyzing the influence of the first-row baffle position on the impact force and accumulation mass of debris flow. Subsequently, based on the selected baffle positions and four factors influencing the effectiveness of baffle protection (baffle position (P), baffle height (h), row spacing (Sr), and angle of transit area (α)), an orthogonal design was employed to further explore the optimal arrangement of baffles. The research results indicate that the use of a baffle structure could effectively slow down the motion velocity of debris flows and dissipate their energy. When the baffle is placed in the transit area, the impact force on the first-row baffle is greater than that when the baffle is placed in the deposition area. Similarly, when the baffle is placed in the transit area, the obstruction effect on debris flow mass is also greater than that when the baffle is placed in the deposition area. Through orthogonal experimental range analysis, when the impact on the first row of baffles is used as the evaluation criterion, the importance of each influencing factor is ranked as α > P > Sr > h. When the mass of debris flow behind the baffle is regarded as the evaluation criterion, the rank is changed to P > α > Sr > h. The experimental simulation results show that the optimal baffle arrangement is: P5, Sr=16, α=35°, h=9. © Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
Keyword ：
Baffle Baffle Debris flow Debris flow Discrete element Discrete element Protective effect Protective effect
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| GB/T 7714 | Sun, X. , Chen, M. , Bi, Y. et al. Protective effects of baffles with different positions, row spacings, heights on debris flow impact [J]. | Journal of Mountain Science , 2024 , 21 (7) : 2352-2367 . |
| MLA | Sun, X. et al. "Protective effects of baffles with different positions, row spacings, heights on debris flow impact" . | Journal of Mountain Science 21 . 7 (2024) : 2352-2367 . |
| APA | Sun, X. , Chen, M. , Bi, Y. , Zheng, L. , Che, C. , Xu, A. et al. Protective effects of baffles with different positions, row spacings, heights on debris flow impact . | Journal of Mountain Science , 2024 , 21 (7) , 2352-2367 . |
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Abstract ：
The baffle effectively slowed down debris flow velocity, reduced its kinetic energy, and significantly shortened the distance of debris flow movement. Consequently, they are widely used for protection against natural hazards such as landslides and mudslides. This study, based on the three-dimensional DEM (Discrete Element Method), investigated the impact of different baffle positions on debris flow protection. Debris flow velocity and kinetic energy variations were studied through single-factor experiments. Suitable baffle positions were preliminarily selected by analyzing the influence of the first-row baffle position on the impact force and accumulation mass of debris flow. Subsequently, based on the selected baffle positions and four factors influencing the effectiveness of baffle protection (baffle position (P), baffle height (h), row spacing (Sr), and angle of transit area (alpha)), an orthogonal design was employed to further explore the optimal arrangement of baffles. The research results indicate that the use of a baffle structure could effectively slow down the motion velocity of debris flows and dissipate their energy. When the baffle is placed in the transit area, the impact force on the first-row baffle is greater than that when the baffle is placed in the deposition area. Similarly, when the baffle is placed in the transit area, the obstruction effect on debris flow mass is also greater than that when the baffle is placed in the deposition area. Through orthogonal experimental range analysis, when the impact on the first row of baffles is used as the evaluation criterion, the importance of each influencing factor is ranked as alpha > P > Sr > h. When the mass of debris flow behind the baffle is regarded as the evaluation criterion, the rank is changed to P > alpha > Sr > h. The experimental simulation results show that the optimal baffle arrangement is: P5, Sr=16, alpha=35 degrees, h=9.
Keyword ：
Baffle Baffle Debris flow Debris flow Discrete element Discrete element Protective effect Protective effect
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| GB/T 7714 | Sun, Xinpo , Chen, Min , Bi, Yuzhang et al. Protective effects of baffles with different positions, row spacings, heights on debris flow impact [J]. | JOURNAL OF MOUNTAIN SCIENCE , 2024 , 21 (7) : 2352-2367 . |
| MLA | Sun, Xinpo et al. "Protective effects of baffles with different positions, row spacings, heights on debris flow impact" . | JOURNAL OF MOUNTAIN SCIENCE 21 . 7 (2024) : 2352-2367 . |
| APA | Sun, Xinpo , Chen, Min , Bi, Yuzhang , Zheng, Lu , Che, Chi , Xu, Ao et al. Protective effects of baffles with different positions, row spacings, heights on debris flow impact . | JOURNAL OF MOUNTAIN SCIENCE , 2024 , 21 (7) , 2352-2367 . |
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在衬砌管片拼装过程中难免出现环端面不平整(或环缝间垫片局部脱空)的情形，进而在顶推力作用下管片容易产生局部开裂破损，严重时甚至危及衬砌结构安全。鉴于此，以衬砌管片抗剪原型试验为基础，在ABAQUS数值分析平台上建立P2型标准块管片的精细化模型，管片上部设置千斤顶靴板，底部设置垫片并使右侧垫片脱空。在靴板上逐级施加均布荷载，以分析局部脱空情况下衬砌管片在逐级顶推力作用下的力学响应，探讨环端面不平整条件下衬砌管片的裂缝发展过程及抗剪承载特性。数值模拟结果表明：顶推力加载至850 kN，管片脱空端竖向位移达到2 mm，管片内弧面上部出现第1道裂缝，内置钢筋仍处于弹性阶段；加载至1 120 kN，脱空端竖向位移达到6 mm，内弧面上出现2道新裂缝，同时第1道裂缝进一步扩展形成内外贯穿性裂缝，即管片裂缝发展过程大致为内弧面→上环端面→外弧面，且裂缝附近上层纵向钢筋达到屈服强度；考虑到内外贯穿裂缝给衬砌管片带来较大渗漏水隐患，认为P2型标准块管片的抗剪承载力(即屈服荷载)约为1 120 kN。将数值模拟结果与原型试验结果进行对比，二者所得管片裂缝分布与扩展规律大致一致，抗剪承载力基本相符，验证了数值模拟结果的可靠性。研究成果可为盾构隧道的衬砌设计与掘进施工提供参考依据。
Keyword ：
原型试验 原型试验 数值模拟 数值模拟 环端面不平整 环端面不平整 盾构隧道 盾构隧道 管片抗剪承载特性 管片抗剪承载特性
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| GB/T 7714 | 关振长 , 杨泽龙 , 宁茂权 et al. 环端面不平整条件下衬砌管片抗剪承载特性研究 [J]. | 铁道科学与工程学报 , 2024 , 21 (04) : 1533-1543 . |
| MLA | 关振长 et al. "环端面不平整条件下衬砌管片抗剪承载特性研究" . | 铁道科学与工程学报 21 . 04 (2024) : 1533-1543 . |
| APA | 关振长 , 杨泽龙 , 宁茂权 , 刘浩 , 郑路 . 环端面不平整条件下衬砌管片抗剪承载特性研究 . | 铁道科学与工程学报 , 2024 , 21 (04) , 1533-1543 . |
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Abstract ：
The baffle effectively slowed down debris flow velocity,reduced its kinetic energy,and significantly shortened the distance of debris flow movement.Consequently,they are widely used for protection against natural hazards such as landslides and mudslides.This study,based on the three-dimensional DEM(Discrete Element Method),investigated the impact of different baffle positions on debris flow protection.Debris flow velocity and kinetic energy variations were studied through single-factor experiments.Suitable baffle positions were preliminarily selected by analyzing the influence of the first-row baffle position on the impact force and accumulation mass of debris flow.Subsequently,based on the selected baffle positions and four factors influencing the effectiveness of baffle protection(baffle position(P),baffle height(h),row spacing(Sr),and angle of transit area(α)),an orthogonal design was employed to further explore the optimal arrangement of baffles.The research results indicate that the use of a baffle structure could effectively slow down the motion velocity of debris flows and dissipate their energy.When the baffle is placed in the transit area,the impact force on the first-row baffle is greater than that when the baffle is placed in the deposition area.Similarly,when the baffle is placed in the transit area,the obstruction effect on debris flow mass is also greater than that when the baffle is placed in the deposition area.Through orthogonal experimental range analysis,when the impact on the first row of baffles is used as the evaluation criterion,the importance of each influencing factor is ranked as α＞P＞Sr＞h.When the mass of debris flow behind the baffle is regarded as the evaluation criterion,the rank is changed to P＞α＞Sr＞h.The experimental simulation results show that the optimal baffle arrangement is:P5,Sr=16,α=35°,h=9.
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| GB/T 7714 | SUN Xinpo , CHEN Min , BI Yuzhang et al. Protective effects of baffles with different positions,row spacings,heights on debris flow impact [J]. | 山地科学学报（英文） , 2024 , 21 (7) : 2352-2367 . |
| MLA | SUN Xinpo et al. "Protective effects of baffles with different positions,row spacings,heights on debris flow impact" . | 山地科学学报（英文） 21 . 7 (2024) : 2352-2367 . |
| APA | SUN Xinpo , CHEN Min , BI Yuzhang , ZHENG Lu , CHE Chi , XU Ao et al. Protective effects of baffles with different positions,row spacings,heights on debris flow impact . | 山地科学学报（英文） , 2024 , 21 (7) , 2352-2367 . |
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When applying the three-dimensional discontinuous deformation analysis (3D-DDA) method to simulate the dynamic response of rock mass in an earthquake, appropriate artificial boundaries and input methods should be considered. In this study, the 3D-DDA method was modified by introducing the viscoelastic artificial boundary and the seismic motion input method based on the wave field decomposition method and with the consideration of the lateral free-field wave. Subsequently, the correctness of the boundary and the input method was verified through numerical examples. The results of the numerical examples were almost consistent with the theoretical solution. The introduced viscoelastic artificial boundary and seismic motion input method improved the applicability of the 3D-DDA method and can be further applied to simulate actual engineering cases. Viscoelastic artificial boundary is applied and validated in 3D-DDA.The differences between viscoelastic boundary and existing boundaries are compared.Modified 3D-DDA can consider wave field decomposition and lateral free-field wave for seismic motion input.Feasibility of modified 3D-DDA to study the dynamic response of rock mass in an earthquake is studied.
Keyword ：
Artificial boundary Artificial boundary Seismic motion input methods Seismic motion input methods Three-dimensional discontinuous deformation analysis method Three-dimensional discontinuous deformation analysis method Viscoelastic boundary Viscoelastic boundary
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| GB/T 7714 | Lin, Si-huang , Deng, Tao , Zheng, Lu et al. Implementation of Viscoelastic Artificial Boundary and Seismic Motion Input Method in Three-Dimensional Discontinuous Deformation Analysis Method [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2024 , 57 (7) : 4995-5015 . |
| MLA | Lin, Si-huang et al. "Implementation of Viscoelastic Artificial Boundary and Seismic Motion Input Method in Three-Dimensional Discontinuous Deformation Analysis Method" . | ROCK MECHANICS AND ROCK ENGINEERING 57 . 7 (2024) : 4995-5015 . |
| APA | Lin, Si-huang , Deng, Tao , Zheng, Lu , Zhang, Hong , Wu, Wei , Fu, Xiao-dong et al. Implementation of Viscoelastic Artificial Boundary and Seismic Motion Input Method in Three-Dimensional Discontinuous Deformation Analysis Method . | ROCK MECHANICS AND ROCK ENGINEERING , 2024 , 57 (7) , 4995-5015 . |
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Sudden freefall is very common in high-velocity and long-runout rockslides. The combination of freefall and joints (a rock mass structure) may cause a high degree of fragmentation of sliding rock mass. However, previous studies often simplified fragmentation of rock mass with initial joints to be caused by impact after sliding, ignoring the contribution of freefall to rockslide fragmentation and spreading. Several multi-stage slope models are created in this study referring to the topographic characteristics of rockslides, including impact after sliding, inter-slope freefall, once-end-slope freefall, and twice-end-slope freefall. The rock masses are simulated by setting different numbers of persistent joints in analog blocks. The joints are described by the unbonded particles. The results suggest that the fragmentation of analog blocks consists of the fracture caused by tensile cracks and the local fragmentation caused by impact. Fragmentation is an effective sink, which shortens the runout distance of the center of the mass. Freefall and initial joints limit the momentum transfer between the front and rear fragments, so the freefall cannot directly promote rockslide spreading. However, freefall and initial joints facilitate the fragmentation of the block, producing a high sphericity of fragments, which are easy to roll and bounce under the disturbance of the freefall. This might be an important reason for the long-runout spreading of rockslides.
Keyword ：
Fragmentation Fragmentation Freefall Freefall Joint Joint Rockslide Rockslide Spreading DEM Spreading DEM
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| GB/T 7714 | Zhu, Zhiyuan , Wu, Yihan , Bi, Yuzhang et al. Contribution of freefall and rock mass structure to post-fragmentation spreading of rockslides [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2024 , 83 (8) . |
| MLA | Zhu, Zhiyuan et al. "Contribution of freefall and rock mass structure to post-fragmentation spreading of rockslides" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 83 . 8 (2024) . |
| APA | Zhu, Zhiyuan , Wu, Yihan , Bi, Yuzhang , Zheng, Lu , Chen, Fei , Wu, Wei et al. Contribution of freefall and rock mass structure to post-fragmentation spreading of rockslides . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2024 , 83 (8) . |
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Shield misalignment is a common problem in shield tunnels, which seriously affects the safety and durability of tunnels. However, at present, there is a lack of research on the influence of shield misalignment on the shear capacity of the circumferential joint structure, and the failure mechanism of the circumferential joint structure before and after reinforcement is not clear. Therefore, this paper simulates the influence of misalignment on the performance mechanism of segmented circumferential connection and the effect of channel reinforcement on the ABAQUS platform. The simulation results are compared with the full-scale test results, and the results show that the shear failure process of the circumferential joint can be divided into three stages under the condition of no reinforcement. In the first stage, the vertical load increases, but the misalignment between the shield tunneling sections is very small. In the second stage, the load almost does not increase, but the degree of misalignment increases. In the third stage, the load-displacement relationship is nonlinear, indicating that the bending bolt has been sheared. Under the condition of unreinforced, the bolt will form two plastic hinges when it fails. After reinforcing the channel, the removal of the bolt forms only one plastic hinge. After channel steel reinforcement, the boundary area between the channel steel web and the steel plate first reaches the ultimate tensile strength of the steel plate, and the failure mode becomes channel steel reinforcement failure. Under the same shear load, the misalignment of the circumferential joint reinforced with channel steel is reduced. In this paper, the misalignment relationship of shear load and the yield of the bending bolt obtained through numerical calculation is consistent with the conclusion of the full-scale test. However, the circumferential connection misalignment obtained via numerical calculation is relatively small. The yield position of the bending bolt is also in good agreement with the test results, and the bolt strain obtained through the test is relatively small.
Keyword ：
channel reinforcement channel reinforcement circumferential joints circumferential joints full-scale test full-scale test misalignment misalignment shield tunneling segments shield tunneling segments
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| GB/T 7714 | Su, Hang , Deng, Tao , Yang, Zengquan et al. Characterization of Shear Damage and Channel Reinforcement of Circumferential Joints between Shield Tunneling Segments Based on Numerical Simulation [J]. | BUILDINGS , 2024 , 14 (2) . |
| MLA | Su, Hang et al. "Characterization of Shear Damage and Channel Reinforcement of Circumferential Joints between Shield Tunneling Segments Based on Numerical Simulation" . | BUILDINGS 14 . 2 (2024) . |
| APA | Su, Hang , Deng, Tao , Yang, Zengquan , Qin, Jianpeng , Zheng, Lu . Characterization of Shear Damage and Channel Reinforcement of Circumferential Joints between Shield Tunneling Segments Based on Numerical Simulation . | BUILDINGS , 2024 , 14 (2) . |
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