摘要
对杭州市地铁建国路站深基坑工程进行检测,分析了深基坑工程墙体水平位移、支撑轴力、地表沉降、建筑物沉降、坑外地下水位等监测数据。研究结果表明:墙体的水平位移往往会被土质所影响,开挖越深,对墙体水平位移的影响越大,在一定程度上反映局部土质好坏情况;在架设或拆除支撑过程中,应加强对支撑轴力变化的监测,要防止支撑轴力的突然增大或减小现象,这样会对基坑的稳定性产生重要影响;地表沉降值随开挖深度增加而增大,沉降曲线与围护挡墙位移形式有关,多呈抛物线形或盆形分布;建筑物沉降值随着与基坑边距离的增加而减小;坑外地下水位的变化可反映围护结构的止水效果。
Jianguo of Hangzhou metro station deep foundation pit engineering,analyzes the deep foundation pit engineering wall horizontal displacement,strut axial forces,surface settlement,settlement of buildings,such as pit under the field level monitoring data.Research results show that the wall horizontal displacement tend to be affected by soil,digging deeper,the greater the influence of horizontal displacement of wall body,to a certain extent,reflects the local soil quality;In the process of erection or dismantling support,should strengthen the monitoring of supporting axial force changes,to prevent the sudden increase or decrease of strut axial forces,which can have an important influence on the stability of foundation pit;The surface subsidence value increases with the increase of excavation depth,settlement curve is associated with retaining wall displacement form,more show parabolic or basin shape distribution;Building subsidence value decreases with the increase of distance as foundation pit edge;Pit field under the change of water level can reflect the effect of water stop of the retaining structure.
引文
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