土岩二元地层中地下连续墙成槽变形的研究及应用

Research and application on deformation of diaphragm wall trench in dual-structure strata

本文以土岩二元地层基坑工程为背景建立数值模型,研究地下连续墙在上部土体和下部岩体成槽开挖过程中槽壁周边土体的变形规律;比较分析成槽施工过程中的监测数据和计算数值,验证计算分析的合理性。研究结果表明,随着地连墙开挖深度的增大,周边土体的水平位移和地表沉降均增大,且水平位移增幅大于地表沉降位移增幅,其中最大水平位移的位置随着开挖深度的增加逐渐向下移动。

Based on a foundation pit engineering in dual-structure strata,this paper established a numerical model to study the deformation rules of soil surrounding the diaphragm wall during the excavation process of the dual-structure strata(the overlaying soil and the underlaying rock).The rationality of the numerical simulation was verified by the comparison of the monitoring data with the calculated result in the process of trench construction.The results show that the horizontal displacement and surface settlement of the surrounding soil increase with the increase of the excavation depth of the diaphragm wall.Moreover,the increase of horizontal displacement is greater than that of surface settlement,and the position of maximum horizontal displacement gradually moves downward with the increase of excavation depth.