基于变形的主动土压力转变分析及数值计算研究  

Numerical Analysis of Active Earth Pressure Conversion Based on Deformation

作　　者：王旭东 WANG Xudong(Gansu Institute of Urban Planning and Design Co.Ltd.,Lanzhou 730070)

机构地区：[1]甘肃省城乡规划设计研究院有限公司,兰州730070

出　　处：《土工基础》2023年第1期64-67,73,共5页Soil Engineering and Foundation

摘　　要：基坑侧土压力的计算是基坑设计的关键,以极限状态和土压力直线分布为特征的朗肯、库仑土压力理论,虽然简单实用,但与实际的基坑力学特性分布不相符。考虑土体的变形、土体与支挡结构的变形,利用数值计算的方法,研究不同的基坑深度、不同的基坑顶部水平位移的情况下,坑侧土压力的分布特性,以及它的发展趋势与转变特点,进而总结出侧土压力的转变与塑性屈服的关系,最后给出了剩余下滑力的公式及剩余下滑力系数。研究得出了一些有益的结论,对类似工程有借鉴意义。The estimation of the lateral soil pressure on the side of foundation excavation is the key to the deep excavation support design and has drawn a wide attention by academia and partitioners in the field. Although the Rankine and Coulomb soil pressure theories, which are characterized by the limit state and the linear distribution of soil pressure, are simple and practical, they are not consistent with the actual distribution of deep excavation mechanical properties. In this paper, considering the deformation of the soil and the deformation of the soil and the supporting structure, using the numerical methods, under the condition of different excavation depth and different top horizontal displacement in the excavation supporting structures, the distribution characteristics of lateral soil pressure, its development trend and transformation characteristics are extensively studied in this paper. The relationship between the lateral soil pressure transformation and the plastic yield is summarized. At last, the formula of the residual sliding force and the coefficient of the residual sliding force are proposed.

关 键 词：侧土压力 剩余下滑力 塑性屈服 数值计算 

分 类 号：TU432[建筑科学—岩土工程]