摘要
针对深厚的富水砂砾潜水含水层中的深基坑降水问题,本文以沈阳某地铁车站深基坑降水工程为依托,采用数值模拟方法,对比分析了富水砂砾地层中无挡水帷幕及不同挡水帷幕深度下深基坑降水至安全水位时的总抽水量、基坑内外水位及降水引起的坑外地表沉降。研究结果表明:挡水帷幕的存在可以很大程度地减少基坑总抽水量及坑外地表沉降;挡水帷幕的深度在一定值时,可以大大减少降水对环境的影响;综合考虑工程对环境的影响与抽水量,得到了最优化的基坑降水方案,即挡水帷幕深为35m、降水井深为32m。
Aiming at the dewatering solution of deep excavation pit in water-rich sand and gravel strata, based on an engineering case of subway station in Shenyang the numerical simulation is adopted to contrast the total discharge, the groundwater level inside and outside the pit, and the settlement outside the pit in different schemes including the scheme without cut-off walls and the schemes with cut-off walls of different depth by meeting the dewatering requirement. The results indicates that the application of cut-off walls will reduce the total discharge and the settlement induced by dewatering in a large scale ; the deeper the cut-off is, the smaller the environmental effect will be; considering the environmental effects and total discharge, the optimal dewatering scheme is the scheme with cut-off walls in the depth of 35m and pumping well in the depth of 32m.
出处
《工程勘察》
2017年第1期34-39,共6页
Geotechnical Investigation & Surveying
基金
国家重点基础研究发展计划(2015CB057806)
关键词
富水砂砾地层
深厚潜水含水层
数值模拟
深基坑降水方案对比
water-rich sand and gravel strata
thick phreatic aquifer
numerical simulation
dewateringscheme comparison of deep excavation pit
