平动模式下刚性挡墙的地震非极限土压力

Seismic Non-Limit Earth Pressure Acting on the Rigid Retaining Wall under the Translation Movement Conditions

传统的地震土压力理论主要研究了地震荷载下挡土墙位移达到极限状态时的土压力,但挡墙能否达到极限位移状态常常与位移模式有关。为更好地反映实际工程情况,需要研究地震非极限土压力理论。针对平动位移模式的挡土墙,考虑摩擦角随挡墙位移的变化,基于水平层单元法,建立了地震非极限主动土压力分布的改进拟动力法,并推导了地震主动土压力合力和合力作用点的计算表达式。将计算所得地震土压力分布结果和前人模型试验的实测数据进行对比,计算的土压力分布曲线与实测分布曲线较吻合,验证了所提方法的合理性。研究成果对发展非极限土压力理论和指导边坡工程的抗震设计有一定参考价值。

The traditional seismic earth pressure theory mainly studies the earth pressure when the displacement of the retaining wall reaches the limit state under seismic loading conditions.However,whether the retaining wall can reach the limit displacement state or not is often related to the displacement mode.In order to better reflect the actual engineering situation,it is necessary to study the theory of seismic non-limit earth pressures.Based on the horizontal layer element method,the improved pseudo-dynamic method of seismic non-limit active earth pressure distribution for the retaining wall under the translational displacement mode is established,which considers the variations of friction angles with the displacement of retaining walls.The analytical expressions of the resultant force and the action point of seismic active earth pressure are also proposed.The results of the seismic earth pressure distribution predicted by this method are compared with the measured data of previous model test results.The calculated earth pressure distribution curve is in good agreement with the measured distribution,which verifies the rationality of the proposed method.The research results have certain reference value for developing the theory of non-limit earth pressure and guiding the seismic design of slope engineering.