广西大学地铁车站深基坑变形监测数据分析

摘要

The background of this paper is the excavation at Guangxi University Station for Nanning Orbit Transit Line 1.It analyzes the dynamic monitoring data during construction.It summarizes the deformation behavior of diaphragm wall and surrounding surface subsidence.The data shows that the subsidence due to excavation is relatively small and its main influence range is 0 to 2H(H is the excavation depth).The position of the maximum settlement value is at 0.5H to 0.7H away from the diaphragm wall.The influence range of subsidence deformation is extended to 4H away from the edge of excavation.According to the deformation behavior,the subsidence estimation curve and environment protection degree division to excavations in gravel area are obtained.%本文以南宁市地铁1号线试验车站广西大学站基坑工程为背景,通过对基坑工程施工动态监测数据进行分析,总结了广西大学站地铁车站深基坑的连续墙变形及周围地表沉降变形特征.监测数据的分析结果表明:广西大学站基坑开挖引起的地表沉降量值比较小,影响范围主要集中于0～2H(H为基坑开挖深度),产生最大沉降值的位置约为墙后0.5 ～0.7H,沉降变形影响最远延伸至距基坑边缘约为4H处；并可依此变形特征规律给出圆砾层地区基坑地表沉降预估曲线与环境保护等级的划分.