摘要
深基坑降水引起的地面沉降已成为现代城市建设的主要灾害之一,其对城市市政建设规划、交通及人们的正常生活产生了极大的影响。该文根据基坑降水引起的地面沉降基本原理,定性论述了对地面沉降影响较大的4个主要人为因子。然后借助ProcessingModflow定量模拟出4个影响因子分别作用时基坑周围地面沉降变化值,并利用数理统计分析软件SPSS中主成分因子分析模块获得各个因子的权重值,进而建立深基坑降水引起的地面沉降影响因子权重体系。据建立的权重体系可知,止水帷幕及回灌措施对控制地面沉降起着决定性作用,基坑设计水位降深和井点管埋置深度也是影响地面沉降不可忽视的因子。
The ground subsidence caused by dewatering of deep foundation pit has become one of the main di- sasters in the construction of modem city, it has great influences on the municipal construction and planning, transportation and normal life of people. According to the basic principles of ground subsidence caused by foundation pit dewatering, the four major artificial factors are obtained on ground subsidence qualitatively. Then the ground subsidence values of foundation pit under the respective action of 4 influencing factors with the help of Processing Modflow are simulated quantitatively, and using the component-factor analysis module of statisti- cal analysis software SPSS, the weighting values of various factors are obtained, the weighting system of influ- encing factors of ground subsidence caused by dewatering in deep foundation pit is established. According to the weighting system, the waterproof curtain and measures of backfill have played decisive role in ground sub- sidence, and the drawdown of water level in the design of foundation pit and buried depth of well point pipe are also unneglectable factors which influenced ground subsidence.
出处
《勘察科学技术》
2012年第6期16-20,共5页
Site Investigation Science and Technology
