折线形墙背土压力计算的扫描搜索法原理与应用  

Principle and Application of Scan⁃Search Method for Calculation of Earth Pressure at Back of Polygonal Retaining Wall

作　　者：李炼 郭海强[1] 徐骏[1] 李安洪[1] LI Lian;GUO Haiqiang;XU Jun;LI Anhong(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道建筑》2021年第4期84-88,共5页Railway Engineering

基　　金：中铁二院工程集团有限责任公司科技研究计划(KYY2019143(19-21);KYY2018075(18-20))。

摘　　要：为简化传统公式法求解折线形墙背土压力的繁琐过程,在库仑土压力理论的基础上,基于第二破裂面法和力多边形法,提出用于快速求解折线形墙背土压力的扫描搜索法。首先,分别通过上墙和下墙踵点建立坐标系,并将地面线按照一定间距分割;其次,以该点到地面线的连线为假定破裂面,根据推导的库仑土压力计算通式求解每一假定破裂面的土压力大小和作用点位置;最后,经搜索获取最大土压力。与传统库仑公式法相比,扫描搜索法计算简便、结果精确、适用范围广,可快速准确地计算各种工况条件、复杂坡面及荷载的墙背土压力。In order to simplify the complicated process of traditional formula method,a scan-search method is proposed to quickly solve the earth pressure behind the polygonal retaining wall,which was based on the Coulomb earth pressure theory and the second fracture surface method and the force polygon method.Firstly,the coordinate system was established through the upper and lower wall heel points,and the ground line was divided according to a certain distance.Secondly,taking the line from the point to the ground line as the assumed rupture surface,the magnitude of earth pressure and the position of acting point on each assumed rupture surface were calculated according to the general formula of Coulomb earth pressure.Finally,the maximum earth pressure is obtained by searching.Compared with the traditional Coulomb formula method,the scan-search method has the advantages of simple calculation,accurate results and wide application range.It can further quickly and accurately calculate the earth pressure at the back of the wall under various working conditions,complex slopes and loads.

关 键 词：扫描搜索法 折线形墙 理论计算 土压力 库仑理论 库仑公式法 

分 类 号：TU432[建筑科学—岩土工程]