岩土力学2024，Vol.45Issue(7)：2011-2023,13.DOI:10.16285/j.rsm.2023.1330
地震作用下桩板墙-锚索组合支护基覆型边坡的动力响应特性
Dynamic response characteristics of bedrock and overburden layer slope supported by a combination of pile-sheet wall-anchor cables under earthquake action
摘要
Abstract
The direction of inertial force under seismic conditions has a significant impact on the equilibrium state of combined structures,soil,and rock masses.To gain a deep understanding of the interaction characteristics between the pile-plate wall combined support structure and the bedrock and overburden layer slope,a series of large-scale shaking table model tests on the slope reinforced by combined structures under sinusoidal wave load were conducted,using a high steep slope at the tunnel portal in the southwestern region as a prototype.The analysis of the time-history characteristics of the pile-soil and the geogrid-anchor cable-slope under the direction of inertial force was considered.The results indicate:(1)Under the action of inertial force,the lattice anchor cable-soil interaction and pile-soil interaction show an approximate time-history consistency law,but the phase difference between the peak value of the inertial force of the slope reinforcement structure along the elevation cannot be ignored.(2)The interaction between the structure and the slope soil depends on the relative inertial motion,and the pile-bedrock interaction is determined by the deformation state of the cantilever section.(3)The inertial force reaches the peak value of the free surface,the dynamic soil pressure reaches the peak value,the pile-soil displacement difference reaches the positive peak value,the pile body shows an active failure state of camber,and the stress on the front side of the anchoring section increases due to camber,so the design using Coulomb active earth pressure should be revised based on the pile-soil conditions.(4)Under sinusoidal wave conditions,the inertial force and deformation of the slope are crucial factors affecting the force distribution characteristics of the combined retaining structure along the elevation.The design of the combined structure needs to focus on the stress concentration area at the foot of the slope and the inertial force amplification area at the top of the slope.This research can provide theoretical support for the seismic reinforcement design of combined structures.关键词
高陡边坡/桩板墙/锚索/振动台试验/相互作用/时程特性/相位Key words
high steep slope/pile-plate wall/anchor/shaking table test/interaction/time-history characteristics/phase分类
建筑与水利引用本文复制引用
何梓雷,蒋关鲁,冯海洲,潘申鑫,何晓龙,李杰..地震作用下桩板墙-锚索组合支护基覆型边坡的动力响应特性[J].岩土力学,2024,45(7):2011-2023,13.基金项目
国家重点研发计划"政府间国际科技创新合作"重点专项(No.2022YFE0104600) （No.2022YFE0104600）
国家自然科学基金资助项目(No.52378463) （No.52378463）
中铁十八局集团科研项目(No.2019H010504).This work was supported by the National Key Research and Development Program of China"Intergovernmental International Science and Technology Innovation Cooperation"(2022YFE0104600),the National Natural Science Foundation of China(52378463)and the Research Project of China Railway 18th Bureau Group Corporation Limited(2019H010504). （No.2019H010504）
