土体应力状态下主动土压力分布研究

Distribution of Active Earth Pressure Based on Soil Stress States

土压力问题一直是支挡结构设计的重要依据之一,经典土压力理论的假设条件会对实际工程的设计造成误差。在经典理论的基础上,分析了墙后土体的应力状态,推导了考虑墙背摩擦情况的侧土压力系数和土压力应力分布计算表达式,通过与Tsagareli砂性土模型试验实测土压力分布对比,说明了本文方法的合理性,并结合算例分别计算了平面破裂面假定和圆弧破裂面假定情况下土压力及其分布。计算结果表明,取库伦搜索真实破裂面的平面假定时,侧土压力系数为常数,土压力与库伦理论结果一致,为线性分布。取最危险圆弧滑动面的曲面假定时,侧土压力系数呈先增大后减小的变化特点,土压力为非线性分布。

Earth pressure is one of the important bases for the retaining structure design,and the reason for the errors in the design calculation of practical engineering is assumptions of classical soil pressure theory.This paper considers the friction of the wall deduced the lateral earth pressure coefficient and earth pressure stress distribution based on soil analysis of states of stresses under the classical theory.Comparison of the measured soil pressure distribution through the Tsagareli sand soil model test,the reasonableness of the method in this paper is explained.Combined with an example,the soil pressure and its distribution under the assumption of plane fracture surface and circular arc fracture surface are calculated respectively.The result indicated that under the assumption of the plane in Coulomb to search the real fracture surface,the lateral earth pressure coefficient is constant and the soil pressure is linear distribution consistent with the results of the Coulomb theory in this paper.The lateral earth pressure coefficient first increases and then decreases under the assumption of the circular dangerous slide surface,and the soil pressure is non-linear distribution.