摘要
基于济南西客站站前广场基坑工程地质、水文地质条件,要求基坑降水避免对邻近京沪高铁路基产生不利影响,采用高压摆喷止水帷幕、基坑管井降水、坑外回灌等降水设计方案。设计无止水帷幕和5种不同深度的止水帷幕等6种工况,采用有限差分软件对基坑降水全过程进行渗流模拟,得到不同工况的降水漏斗曲线。通过降水影响范围、及坑外最大降深,对止水帷幕优化分析,设计止水帷幕深24 m。工程实践证明本基坑降水方案设计是合理的,可以为周边基坑降水方案设计提供参考。
In order to avoid the detrimental effect of foundation dewatering on the nearby Beijing-Shanghai ex- press railway the engineering geology and hydrogeology conditions of the foundation are considered and comprehensive design of dewatering scheme is adopted. Methods of dewatering include high pressure pendulum gush waterproof curtain, casing well precipitation, well injection, and so on. Non-waterproof curtain and five kinds of different waterproof curtains are designed and finite difference software is used to simulate the seepage during the whole process of dewatering. Also, the precipitation funnel curves of different designs have been gained. Optimization is finished ac- cording to precipitation influenced range and the largest drawdown value outside foundation pits, and the conclusion is that the depth of waterproof curtain should be 24 meters. Engineering practice shows that the dewatering project of the foundation pit is reasonable and can provide reference to design of dewatering schemes for the nearby foundation pits.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第5期1161-1165,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(50820135907
50909056)
关键词
基坑
降水方案设计
止水帷幕
渗流模拟
foundation pit
design of dewatering scheme
waterproof curtain
seepage simulation
