地震荷载作用下的挡土墙土压力分析

Analysis of Retaining Wall Earth Pressure under Seismic Role

基于平面滑裂假设,采用静力平衡分析的方法,推导了考虑填土黏聚力、填土坡角及黏性土表面开裂等因素的地震土压力计算公式,利用图解法得到了临界破裂角的解析解,并分析了墙背倾角、填土坡角、填土黏聚力、水平地震系数以及填土开裂对地震土压力的影响.研究表明填土坡角和填土间黏聚力对地震土压力影响显著;地震荷载作用下,主动土压力和被动土压力随水平地震系数的递增分别增大与减小;忽略黏性土表面开裂情况会使得到的主动土压力计算结果偏小.

Based on the planar rupture surfaces hypothesis,the method of static equilibrium analysis was used to deduce the seismic earth pressure formula,which considers a series of factors including filled soil cohesion,fill slope angle,surface cracking of cohesive soil,and the graphic method was used to obtain analytical solution of critical rupture angle,and the effects of grading angle,the angle of fill slope,cohesive force of fill,horizontal seismic coefficient and cracking of soil on seismic earth pressure were analyzed. The results indicated that the angle of fill slope and cohesive force of fill exert a significant influence on seismic earth pressure; under seismic loads,with the increase of horizontal seismic coefficient,active earth pressure increases and passive earth pressure decreases,respectively; if the situation of surface cracking of cohesive soil was not taken into account,the calculation results of active earth pressure are relatively small.