数值模拟技术在基坑降水中的应用  

APPLICATION OF NUMERICAL MODELING TO DEWATERING DESIGN FOR FOUNDATION PIT

作　　者：孙蓉琳[1] 梁杏[1] 张晓伦[1] 陈树林[2] 

机构地区：[1]中国地质大学工程学院,武汉430074 [2]冶金工业部武汉勘察研究院,武汉430080

出　　处：《岩石力学与工程学报》2003年第z1期2333-2337,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：基坑降水设计常采用大井法计算基坑排水总量,再根据单井出水量,计算排水井的数目和间距,简单易行。但是当水文地质条件复杂,不能引用影响半径时,就不符合裘布依井流公式的适用条件,也就不能再用大井法计算排水量;同时,对于施工复杂的特大型深基坑工程,仅简单地进行均匀布井或非均匀布井,不能预测降水的非稳定过程,且并不一定能保证降水的效果。应用数值模拟技术探讨了解决这些问题的办法,并以长江下游某大桥锚碇区基坑降水工程为例,建立三维渗流数值模型,计算了基坑降水的排水总量,提出了基坑外降水井的最优布设方案。该方案用于指导工程施工,取得了比较理想的效果.The total water displacement is obtained through the generalized large well method in the dewatering design for foundation pits,and then the number of wells and space between wells are calculated based on the out-let of single pumping well.The generalized large well method is not applicable when the influence radius doesn't exit and the complicated hydrogeological condition is not fit to the condition of Dupuit well-flow formula. At the same time,simple dewatering design based on uniform or uneven distribution of pumping wells for the complexed deep foundation pit may not always assure the effect of dewatering.Numerical modeling techology is suggested to solve the problem.A model of concrete anchor area is built up for a bridge on the lower reach of Yangtze River.The total water displacement is calculated and the collation project of the pumping wells in the dewatering outside of foundation pit is presented.The scheme is successfully used to instruct construction and an ideal effect is gotten.

关 键 词：土力学 基坑降水 大井法 影响半径 深基坑 数值模拟 

分 类 号：TU46+3[建筑科学—结构工程]