岩土力学2025，Vol.46Issue(2)：640-652,13.DOI:10.16285/j.rsm.2024.0397
RBT模式下刚性挡墙非极限主动土压力的离散元模拟及理论研究
Discrete element simulation and theoretical study on non-limit active earth pressure of rigid retaining wall under RBT mode
摘要
Abstract
This study investigates the distribution of non-limit active earth pressure in sand under the rotation around the base and translation coupling(RBT)mode of rigid retaining wall.Three groups of position parameter of rotation center(n=0.5,1.0,and 5.0)are selected for discrete element simulation study.The results indicate that the active earth pressure in RBT mode exhibits both concave distribution characteristics of the rotation around base(RB)mode and linear distribution characteristics of the translational(T)mode in rigid retaining walls.During failure,the wall-soil friction angle usually reaches its limit value before the internal friction angle.The slip surface behind the wall forms a curve,with a noticeable principal stress deflection at the soil slip surface.Based on the numerical simulation results,the relationship between the equivalent internal friction angle of the interlayer and the position parameter of rotation center n is derived using the middle symmetrical arc arch.The force equilibrium equation for the curved trapezoidal differential unit is established using the horizontal layer analysis method,and the numerical solution for non-limit active earth pressure in RBT mode is obtained using the finite difference method.Parameter analysis shows that displacement,internal friction angle and n significantly affect the active earth pressure.Comparison of numerical simulations and model tests verifies the rationality and reliability of the theory presented in this paper.The findings provide a valuable reference for calculating earth pressure in rigid retaining walls.关键词
RBT模式/非极限主动土压力/离散元法/土拱效应/层间等效内摩擦角/水平层分析法Key words
RBT mode/non-ultimate active earth pressure/discrete element method/soil arching effect/equivalent internal friction angle of interlayer/horizontal layer analysis method分类
建筑与水利引用本文复制引用
姚嘉楠,徐长节,迟民良,王艳萍,习跃来,王伟锋,冯国辉,孙佳政..RBT模式下刚性挡墙非极限主动土压力的离散元模拟及理论研究[J].岩土力学,2025,46(2):640-652,13.基金项目
国家自然科学基金(No.52238009) （No.52238009）
国家自然科学基金-高铁联合基金(No.U1934208) （No.U1934208）
江西省自然科学基金-揭榜挂帅资助项目(No.20223BBG71018). This work was supported by the National Natural Science Foundation of China(52238009),the National Natural Science Foundation of China-High-Speed Rail Joint Fund(U1934208)and the Natural Science Foundation of Jiangxi Province-Unveiling the Leader Funding Project(20223BBG71018). （No.20223BBG71018）
