高富水砂层地铁竖井动态降水优化及固结变形预测  

Dynamic Optimization of Pumping and Consolidation Deformation Prediction of Vertical Shafts of Metro Works in the High Water-Rich Sand Layer

作　　者：陈仕阔[1] 杨天鸿[1] 王航[2] 刘洪磊[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中煤国际工程集团沈阳设计研究院,辽宁沈阳110015

出　　处：《东北大学学报（自然科学版）》2011年第9期1328-1331,共4页Journal of Northeastern University(Natural Science)

基　　金：东北大学优秀博士论文培育基金资助项目(N100601003;N090601003);东北大学创新团队建设项目(N090101001);国家重点基础研究发展规划项目(2007CB209405);国家自然科学基金重点资助项目(51034001);国家自然科学基金资助项目(10872046);教育部高等学校博士学科点专项科研基金新教师项目(200801450003)

摘　　要：针对沈阳地区高富水砂层的水文地质特征,采用多物理场耦合分析软件Comsol Multiphysics,基于Boit固结理论,考虑砂土体的线弹性变形特征,建立了精细描述井群抽水引起地面变形动态过程的三维渗流-应力耦合模型.通过水位拟合以及位移反分析进行参数反演分析优化降水系统,并采用地表变形指标来综合预测降水引起的地面建筑物以及地下管线的变形.对比发现:该模型稳定性好,抽水77d后水位达到动态平衡;地表变形满足施工安全性要求,通过井距、井数优化,抽水井流量优化,节约成本,能得到良好经济效益与社会效益,具有工程实用价值.Aiming at the hydrogeology characteristics of high water-rich sand layer in Shenyang,making use of the analysis software of Comsol Multiphysics,and taking into account the linear elastic deformation nature of sandy soil,a three-dimensional seepage-stress coupled model was established on the basis of the Biot＇s consolidation theory.It describes the dynamic process of the ground deformation due to dewatering by multi-port pumping wells.The numbers,distance and pumping capacity of the wells are optimized by the inverse analysis of parameters through water fitting and displacement back analysis.Furthermore,the deformation of the building and underground pipes caused by the dewatering can be forecasted with the settlement,incline,curvature and horizontal displacement.It is shown that this model is stable and the water level can get dynamic equilibrium by pumping for 77 days.The ground deformation satisfies the requirement of the construction safety.It has good practical,economic and social benefits by the way of optimizing the distance,numbers and the pumping flow of the wells.

关 键 词：高富水砂层 降水动态优化 固结变形 流固耦合 变形预测 

分 类 号：TU375.4[建筑科学—结构工程]