摘要
复杂城市环境条件下深大基坑工程降排水所引发的地面沉降问题日益突出,针对地面沉降的控制措施已引起普遍关注。本文采用考虑饱和土流固耦合的有限元方法建立深基坑工程的二维分析模型,模拟深基坑施工的降水开挖过程,研究深厚承压含水层中止水帷幕深度和坑外地下水回灌等措施对地面沉降的影响规律。结果表明,加深止水帷幕和加大回灌量均可以有效地减小基坑外的水位变化,控制降水开挖引发的坑外地面沉降。止水帷幕深度超过抽水井深度10 m时,止水帷幕的控制作用最优;回灌量至少达到抽水量1/5,回灌才会对地面沉降有较明显的影响。
As environmental impact induced by deep excavation and drainage in complex urban condition gets increasing attention, ground surface settlement controlling has been a hot study area. This paper mainly focused on impacts caused by various sealing curtain depth in the confined aquifer and groundwater recharge outside the excavation. To analysis the overall excavation process, a two dimensional numerical model which took fluid-solid coupling mechanics into consideration was adopted in this paper. The numerical calculation indicated that a deeper sealing curtain and a larger groundwater recharge volume would result in an effective controlling for ground surface settlement. To be specific, a 10 m-sealing curtain and a recharge quantity which equaled 20% of the pump-out would minimize the environmental impact.
出处
《山东农业大学学报（自然科学版）》
CSCD
2016年第5期760-764,共5页
Journal of Shandong Agricultural University：Natural Science Edition
基金
国家自然基金项目(41372282)
关键词
降水开挖
地面沉降
控制措施
Rainfall and excavation
ground settlement
control measures
