基坑开挖对周边环境影响的试验研究

Experimental Research on Surrounding Environmental Impact Owing to The Foundation Pit's Excavation

通过基坑开挖的变形测量实例,观测到基坑开挖时坡后土体的沉降和水平位移具有相关性,可以由实测的土体水平位移推算坡后不同深度土层的沉降量,并分别从土体沉降量和沉降曲线的斜率两种特性来确定基坑开挖在坡后土体中产生形变的范围。在判断影响范围时,单纯以建筑物距基坑距离与基坑深度的比值b/H来确定不够准确,应同时考虑基础埋深和沉降分布曲线的形状。

Based on a foundation pit deformation survey example,it is observed that settlement and horizontal displacement of soil body behind the slope have correlation each other,so the settlement on vary depth of soil body of the slope can be calculated by the horizontal displacement of the soil in the slope from field test.In order to confirming the settlement area owing to the foundation pit＇s excavation,we can analyze it through soil body＇s settlement values and settlement curve＇s slope.Confirming the influence area only based on the ratio between distance from the pit and depth of the pit（b/H）is not veracious,the foundation＇s embedment depth and figure of settlement distributing curve should be considered together.