悬臂式挡土墙地震主动土压力拟动力分析

地震作用下悬臂式挡土墙主动土压力的计算十分重要。为了分析悬臂式挡土墙在地震荷载作用下主动土压力分布情况,基于滑楔体平衡理论,考虑水平、竖向地震力随时间变化对地震主动土压力的影响,运用拟动力学方法,推导出地震主动土压力、第二临界破裂角的计算公式,并研究挡土墙后填土的内摩擦角和粘聚力、挡土墙与后填土之间的摩擦角和粘聚力、墙体倾角等参数对地震主动土压力系数和临界破裂角的影响。研究结果表明:第二临界破裂角随竖向地震力系数、挡土墙后方填土内摩擦角的增大而增大,随水平地震力系数、挡土墙与后方填土摩擦角的增大而减小;地震主动土压力随水平、竖向地震力系数的增大而增大,随挡土墙后方填土内摩擦角的增大而减小。

Pseudo-dynamic Analysis of Active Earth Pressure of Cantilever Retaining Wall in Earthquake

It is very important to calculate the active earth pressure of cantilever retaining wall under earthquake. To analyze the active earth pressure distribution of cantilever retaining wall under seismic load,by applying the proposed dynamic method and considering the impact of variation of horizontal and vertical earthquake force on seismic active earth pressure, the calculating formulas of the critical Angle of rupture and seismic active earth pressure were deduced,and the influence of parameters on the seismic active earth pressure coefficient and the critical Angle of rupture were also investigated. The results show that the second critical fracture Angle increases with the increase of the vertical seismic force coefficient and decreases with the increase of the horizontal seismic force coefficient. The active earth pressure increases with the increase of horizontal and vertical seismic force coefficients.