Numerical simulation analysis of dewatering and recharge process of deep foundation pits
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摘要: 武汉地区部分超深基坑基底已揭穿承压含水层,地下水势必对基坑开挖造成影响,必须对地下水进行有效控制。以武汉市妇女儿童医疗保健中心综合业务楼深基坑降水工程为例,对深基坑降水与回灌过程进行三维数值模拟,分析探讨了模拟的可行性及准确性,并研究了不同回灌方法的回灌效果、回灌对坑外水位变化及地面沉降的影响。结果表明：回灌对提高坑外水位有明显作用,且回灌量越大,水位恢复越多。采用坑外回灌可控制降水引起的地面沉降,且回灌量越多,能控制的沉降量也越大。Abstract: Part of the ultra-deep foundation pits have debunked confined aquifer in Wuhan area, and thegroundwater is bound to affect the excavation. So the groundwater should be effectively controlled. Taking the dewatering of deep foundation pit of Integrated Services Building of Wuhan Women and Children Health Care Center as an example the dewatering and recharge process are simulated by using Visual Modflow. The feasibility and accuracy of simulations are analyzed, and the effcienly of different recharge methods and the impact of recharge on changes in water level and ground settlement outside the deep foundation pit are studied. The results show that the recharge plays a significant role in improving water outside the deep foundation pit, and the greater the amount of recharge, the more the water level recovery. The settlement outside the deep foundation pit can be reduced by recharge, and the more the recharge amount, the more the controlled settlement.
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Keywords:
- deep foundation pit /
- dewatering /
- recharge /
- numerical simulation
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