土钉支护工程施工中的环境变形监测

Environment deformation monitoring for deep pit retained by soil nailing structure

以采用无砂混凝土小桩和土钉分段支护的基坑工程为背景,具体介绍坑壁测斜、邻域内结构物沉降监测方法及成果,并对成果进行分析,认为基坑降水和CFG桩施工对基坑底面以上的粉土层扰动最大,邻域内结构物的沉降与其基础埋深和距离基坑的远近直接相关,当基础埋深浅位于基坑降水影响范围内时,结构物受基坑施工影响较为明显。

Based on the deformation monitoring on case pit retained by composite soil nailing and non-aggregate mini-pile technology, the following conclusions are drawn: the fine layer under the level of pit bottom is the most sensitive soil to ground water lowering and construction of CFG piles; the settlement of civil structures in the adjacent area is significantly affected by the depth and distance from the pit. When the foundation is near enough to the pit, the settlement may be large.