【摘要】 为了对富水软土地层地铁隧道开挖引起的地层固结进行定量研究,考虑流固耦合效应和施工力学效应的综合作用,应用FLAC3D对降水、动态降水和非降水3种工法进行数值模拟的对比研究,分别得到了地表沉降和地层固结沉降曲面。研究结果表明,3种工法引起的地表沉降量分别为:非降水法29mm、动态降水法60mm和降水法116mm,它们的比值大致为1∶2∶4,地层固结沉降量占各自的整个地表沉降量的比率分别为:非降水法27%;动态降水法50%;降水法79%。显然,非降水法是在富水软土地层地铁隧道施工中控制地层固结沉降最有效的方法。计算结果与现场实测资料进行比较,两者十分接近。研究成果已成功地应用于深圳地铁工程中。更多还原

【Abstract】 A quantitative research is conducted on the strata consolidation caused by metro tunneling in saturated soft clay strata in an effort to select the best construction method.When the integrated effects of fluid-solid coupling and tunneling mechanics are taken into account,FLAC3D is applied to conduct the numerical simulation of pumping,dynamic pumping and non-pumping construction methods so as to respectively obtain the curved surfaces of both ground surface subsidence and strata consolidation subsidence,which largely approximate to the data by spot measuring.The research results reveal that the amount of ground surface subsidence caused by pumping,dynamic pumping and non-pumping construction methods is respectively 29 mm,60 mm and 116 mm with a ratio of 1∶2∶4 and that the percentage of strata consolidation subsidence vs.whole ground surface subsidence in the three methods is respectively 27%,50% and 79%.Apparently,the non-pumping construction method is the most effective method of controlling strata consolidation subsidence induced by metro tunneling in saturated soft clay strata.The research results have been successfully applied in the construction of Shenzhen metro.更多还原