摘要
为了研究地连墙插入第一承压含水层不同深度情况下降水对基坑周边地下水位变化和地表沉降的影响规律,采用MIDAS/GTS数值分析软件,对苏州地铁4号线某车站基坑降水建立了三维有限元分析模型对其进行预测分析。结果表明,坑外水位变化和地表沉降随着地连墙插入第一承压含水层深度的增加,其相应的变化趋势基本一致,即:当地连墙插入第一承压含水层的相对深度小于其厚度的30%时,坑外水位降深和地表沉降变化趋势较为缓慢;当达到其厚度的50%~80%,此时坑外水位降深和地表沉降值以较大的速率减小,且当相对插入深度超过70%时,其相应的变化趋势更加明显;当大于其厚度的80%以上,此时水位变化和地表沉降值以较大的、近似线性的速率减小,至完全隔断承压含水层时,降水对周围环境的影响基本无影响。
To analyze the change of groundwater level and land subsidence outside the foundation pit caused by dewatering under conditions of different inserted depth of disphragram wall in the first confined aquifer,a 3-D finite element analysis model of the deep pit dewatering of one station at Suzhou Metro Line No. 4 is established by using MIDAS / GTS. The result shows that the trends of drawdown and land subsidence are basically consistent with the increase of the inserted depth of disphragram wall in the aquifer,that is,when the inserted depth of the disphragram wall is less than 30% of the thickness of the aquifer,the trends of drawdown and land subsidence are relatively slow;and when it reaches 50% to 80% of the thickness of the aquifer,their trends are in a larger rate,especially when it exceeds the 70% of the thickness of the aquifer,their changes are obvious; and when it is over 80% of the thickness of the aquifer,the corresponding changes of their values decrease in a larger,nearly linear rate,and until the disphragram wall completely cut off the confined aquifer,there is almost no impact on the surrounding environment.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第S1期272-277,共6页
Chinese Journal of Underground Space and Engineering
基金
苏州轨道交通集团有限公司科学基金资助项目(SZGDKY201303)
关键词
基坑
地连墙
降水
环境影响
foundation pit
disphragram wall
dewatering water
environment impact
