Query：
学者姓名：郑路
Refining：
Year
Type
Indexed by
Source
Complex
Co-
Language
Clean All
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The unevenness of ring faces (or the local gaps due to gaskets) is inevitable during the assembling of lining segments, which could cause the cracking or damage of segments and might endanger the safety of lining structure in severe cases. Based on the shear resistance prototype test of lining segment, the refined numerical simulation for the P2-typed standard segment was established upon the ABAQUS numerical platform. The jacking plates were placed on the top of segment, the gaskets are placed at the bottom of segment, and the right gasket was left empty to form a local gap. The uniform load was gradually applied upon the top of segment through jacking plates. The mechanical responses of the segment with local void condition were analyzed under the gradual action of jacking force. The cracking process and the shearing capacity of segment with uneven ring face condition were well focused on. The simulation results show that the 1st crack appears on the upper part of segment inner surface with 2 mm under the jacking force of 850 kN. When the jacking force increases to 1 120 kN, the vertical displacement of the segment bottom reaches 6 mm. Another two new cracks appear on the segment inner surface, and the 1st crack further expands to the outer surface and develops into the penetrating cracks. The cracking process of the segment is described sequentially as inner surface → upper ring surface → outer surface. Considering the potential risk of leakage of water caused by penetrating cracks, the shear capacity (yield load) of P2-typed standard segment was determined to be approximately 1 120 kN. Comparing the numerical simulation results with the prototype test, the cracking expansion, the distribution pattern and the shearing capacity obtained from both two means were almost consistent, which implies the reliability of numerical simulation. These results can provide reference for the design and construction of shield tunnel. © 2024, Central South University Press. All rights reserved.
Keyword ：
Gaskets Gaskets Numerical models Numerical models Plates (structural components) Plates (structural components) Shearing Shearing Shielding Shielding Simulation platform Simulation platform Tunnel linings Tunnel linings
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Guan, Zhenchang , Yang, Zelong , Ning, Maoquan et al. On the shearing capacity characteristics of lining segment with uneven ring surface condition [J]. | Journal of Railway Science and Engineering , 2024 , 21 (4) : 1533-1543 . |
| MLA | Guan, Zhenchang et al. "On the shearing capacity characteristics of lining segment with uneven ring surface condition" . | Journal of Railway Science and Engineering 21 . 4 (2024) : 1533-1543 . |
| APA | Guan, Zhenchang , Yang, Zelong , Ning, Maoquan , Liu, Hao , Zheng, Lu . On the shearing capacity characteristics of lining segment with uneven ring surface condition . | Journal of Railway Science and Engineering , 2024 , 21 (4) , 1533-1543 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Soil desiccation is a common physical phenomenon, which causes many geotechnical problems to unsaturated clayey soils. In this paper, a proposed model was incorporated into the original Discontinuous Deformation Analysis (DDA) to simulate the full desiccation process of a clayey soil from volume shrinkage to desiccation cracking and then to desiccation curling by focusing on soil suction. In this model, evaporation-induced soil volume shrinkage and suction-induced tensile failure were separately considered, in particular, soil suction was reasonably treated as an equivalent attractive force rather than a strength parameter. Then, a constrained desiccation test was simulated using the extended DDA model, and obtained numerical results were compared with the experimental results. The comparison results show that this model can capture the main features of the full desiccation process of the clayey soil. Moreover, the influences of soil suction and sample thickness on the desiccation cracking and curling were investigated, which agrees with the laboratory observations. This work aims to propose a novel yet simple model to reproduce the key characteristics of the soil's full desiccation process, and the results demonstrate that the extended DDA model can be served as a promising approach to analyzing the full desiccation process of clayey soils.
Keyword ：
Cracking Cracking Curling Curling Extended DDA Extended DDA Full desiccation process Full desiccation process Soil suction Soil suction
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Guo, Longxiao , Chen, Guangqi , Ding, Luqiang et al. Numerical simulation of full desiccation process of clayey soils using an extended DDA model with soil suction consideration [J]. | COMPUTERS AND GEOTECHNICS , 2023 , 153 . |
| MLA | Guo, Longxiao et al. "Numerical simulation of full desiccation process of clayey soils using an extended DDA model with soil suction consideration" . | COMPUTERS AND GEOTECHNICS 153 (2023) . |
| APA | Guo, Longxiao , Chen, Guangqi , Ding, Luqiang , Zheng, Lu , Gao, Jingyao . Numerical simulation of full desiccation process of clayey soils using an extended DDA model with soil suction consideration . | COMPUTERS AND GEOTECHNICS , 2023 , 153 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Joint structure and sudden free-fall are very common in rock avalanches. But their contributions to fragmen-tation and subsequent runout are not clear. Previous studies simplify joints as persistent structural planes with unbonded strength, weakening the contribution of passive disintegration. The rock avalanches are limited to impact after sliding, as rocks crush from a slope to a horizontal plane. This study establishes three-stage slope models and blocks with non-persistent joints to study the fragmentation and spreading under the impact after freefall by the discrete element method (DEM). The results suggest that (1) The spreading distance is determined by the competition between the energy consumed and the high-velocity fragments generated by fragmentation. It is inaccurate to estimate the runout trend only from the fragmentation degree. (2) The joint surface destroys the integrity of blocks and promoted fragmentation. The joint length, distribution form, and angle significantly affect spreading. (3) Free-fall increases the impact velocity and angle of blocks. The contact-damping and strain energy consumption increase significantly. Due to the lack of slope support, the rear fragments do not have a secondary acceleration effect. The momentum transfer between the front and rear fragments is hindered.
Keyword ：
DEM DEM Fragmentation Fragmentation Free-fall Free-fall Joint structure Joint structure Rock avalanche Rock avalanche
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zhu, Zhiyuan , Wu, Yihan , Zheng, Lu et al. Contributions of joint structure and free-fall to the fragmentation of rock avalanche: Insights from 3D discrete element analyses [J]. | COMPUTERS AND GEOTECHNICS , 2023 , 160 . |
| MLA | Zhu, Zhiyuan et al. "Contributions of joint structure and free-fall to the fragmentation of rock avalanche: Insights from 3D discrete element analyses" . | COMPUTERS AND GEOTECHNICS 160 (2023) . |
| APA | Zhu, Zhiyuan , Wu, Yihan , Zheng, Lu , Chen, Fei , Wu, Wei , Zhang, Hong et al. Contributions of joint structure and free-fall to the fragmentation of rock avalanche: Insights from 3D discrete element analyses . | COMPUTERS AND GEOTECHNICS , 2023 , 160 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Earthquake-induced strong near-fault ground motion is typically accompanied by large-velocity pulse-like component, which causes serious damage to slopes and buildings. Although not all near-fault ground motions contain a pulse-like component, it is important to consider this factor in regional earthquake-induced landslide susceptibility assessment. In the present study, we considered the probability of the observed pulse-like ground motion at each site (PP) in the region of an earthquake as one of the conditioning factors for landslide susceptibility assessment. A subset of the area affected by the 1994 Mw6.7 Northridge earthquake in California was examined. To explore and verify the effects of PP on landslide susceptibility assessment, seven models were established, consisting of six identical influencing factors (elevation, slope gradient, aspect, distance to drainage, distance to roads, and geology) and one or two factors characterizing the intensity of the earthquake (distance to fault, peak ground acceleration, peak ground velocity, and PP) in logistic regression analysis. The results showed that the model considering PP performed better in susceptibility assessment, with an area under the receiver operating characteristic curve value of 0.956. Based on the results of relative importance analysis, the contribution of the PP value to earthquake-induced landslide susceptibility was ranked fourth after the slope gradient, elevation, and lithology. The prediction performance of the model considering the pulse-like effect was better than that reported previously. A logistic regression model that considers the pulse-like effect can be applied in disaster prevention, mitigation, and construction planning in near-fault areas.
Keyword ：
1994 Northridge earthquake 1994 Northridge earthquake Earthquake Earthquake Landslides Landslides Logistic regression Logistic regression Pulse-like ground motion Pulse-like ground motion Susceptibility assessment Susceptibility assessment
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Liu, Jing , Fu, Hai-ying , Zhang, Ying-bin et al. Effects of the probability of pulse-like ground motions on landslide susceptibility assessment in near-fault areas [J]. | JOURNAL OF MOUNTAIN SCIENCE , 2023 , 20 (1) : 31-48 . |
| MLA | Liu, Jing et al. "Effects of the probability of pulse-like ground motions on landslide susceptibility assessment in near-fault areas" . | JOURNAL OF MOUNTAIN SCIENCE 20 . 1 (2023) : 31-48 . |
| APA | Liu, Jing , Fu, Hai-ying , Zhang, Ying-bin , Xu, Pei-yi , Hao, Run-dan , Yu, Hai-hong et al. Effects of the probability of pulse-like ground motions on landslide susceptibility assessment in near-fault areas . | JOURNAL OF MOUNTAIN SCIENCE , 2023 , 20 (1) , 31-48 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Inspired by the geomorphologic phenomenon of step-pool bed configuration, analogous dissipation structures are set in drainage channels to mitigate granular flow hazards. The sensible design of artificial step-pool systems remains an important and open issue. The discrete element method was utilized in this study to investigate the flow characteristics of viscous granular flow in an artificial step-pool system, and an optimization was proposed. First, a numerical model of the granular flow-structure interaction was given and validated. The influence of design parameters on the velocity reduction ratio P and peak impact force F-max was then investigated. Finally, a new step-pool system was presented and evaluated. The results reveal that: (1) P decreases linearly as the slope i increases. The relative layout spacing omega enhances P, but reduces the efficiency of velocity control per unit length structure; (2) the increase in omega stabilizes the distribution of F-max on 2# to 5# baffles. There exists a "peak effect'' of the average peak impact force F-a with the variation of the impact angle beta and the relative baffle height psi (when beta = 75 degrees or psi = 0.27, the F-a reaches a maximum); (3) the optimized structure can control the phenomenon of granular jump while having good guiding performance and more stable impact characteristics. The energy dissipation rate E of optimized structure reaches 91%, an increase of nearly 24% over the original structure.
Keyword ：
Discrete element method Discrete element method Drainage channel optimization Drainage channel optimization Energy dissipation Energy dissipation Granular flow hazards Granular flow hazards Step-pool system Step-pool system
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Bi, Yu-zhang , Li, Meng-jie , Wang, Dong-po et al. A numerical study of viscous granular flow in artificial step-pool systems: flow characteristics and structure optimization [J]. | ACTA GEOTECHNICA , 2023 , 18 (12) : 6275-6295 . |
| MLA | Bi, Yu-zhang et al. "A numerical study of viscous granular flow in artificial step-pool systems: flow characteristics and structure optimization" . | ACTA GEOTECHNICA 18 . 12 (2023) : 6275-6295 . |
| APA | Bi, Yu-zhang , Li, Meng-jie , Wang, Dong-po , Zheng, Lu , Yan, Shuai-xing , He, Si-ming . A numerical study of viscous granular flow in artificial step-pool systems: flow characteristics and structure optimization . | ACTA GEOTECHNICA , 2023 , 18 (12) , 6275-6295 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
由于混凝土桩基在工程中的广泛应用，其无损检测成为一个被广泛关注的课题。而传统的信号处理方式，如傅立叶变换、小波变换等，在处理非线性非稳态信号时存在着一定的不足。本文采用最新的希尔伯特-黄变换(HHT)方法对一个存在不良状况的混凝土桩和一个完整桩的测桩信号作了分析。并且利用边际谱对不同的不良状况引起的频率分布变化进行了探讨，比较了利用HHT方法对桩身不良状况进行定位的准确性，并进一步得出了当机械波通过不同种类的不良状况时，所得信号在HHT边际谱上所表现出的差异性。
Keyword ：
Concrete Piles Concrete Piles HHT HHT Marginal Spectrum Marginal Spectrum Nondestructive Examination Nondestructive Examination 混凝土桩基检测 混凝土桩基检测 边际谱 边际谱
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 黄弈茗 , 郑路 , 薛尚铃 et al. 基于HHT方法的混凝土桩无损检测 [J]. | 土木工程 , 2023 , 12 (12) : 1455-1466 . |
| MLA | 黄弈茗 et al. "基于HHT方法的混凝土桩无损检测" . | 土木工程 12 . 12 (2023) : 1455-1466 . |
| APA | 黄弈茗 , 郑路 , 薛尚铃 , 刘立平 . 基于HHT方法的混凝土桩无损检测 . | 土木工程 , 2023 , 12 (12) , 1455-1466 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
本实用新型涉及一种适用于连接曲面构件的紧固件，包括至少两个曲面构件，两个曲面构件之间经紧固件结构固定，紧固件结构包括设置在曲面构件的凹面内的异形螺母，异形螺母靠近曲面构件凹面的一侧设有与其相适配的弧形面，定位件由曲面构件的凸面依次穿过曲面构件、异形螺母延伸至曲面构件的凹面。本实用新型结构简单，设计合理，有利于螺母与被连接曲面构件的弧度相适应，使两个曲面构件紧密贴合，增大紧固件与被连接件之间的接触面积，大幅度减少应力集中现象，增加两个曲面构件之间的压紧力。
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 邓涛 , 郑路 , 郑锋锺 et al. 一种适用于连接曲面构件的紧固件 : CN202222698529.8[P]. | 2022-10-13 00:00:00 . |
| MLA | 邓涛 et al. "一种适用于连接曲面构件的紧固件" : CN202222698529.8. | 2022-10-13 00:00:00 . |
| APA | 邓涛 , 郑路 , 郑锋锺 , 许杰 , 郑嘉勇 , 赖鹏安 . 一种适用于连接曲面构件的紧固件 : CN202222698529.8. | 2022-10-13 00:00:00 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Export
| Results： |
Selected to |
| Format： |
