Measurement of Seepage Parameters and Optimization of Seepage Control Plan for the Foundation Pit of Fenghuangjing Pump Station in Yangtze-to-Huaihe Water Diversion Project
The dewatering problem in the excavation process of the foundation pit is important and complicated.This paper takes the Fenghuangjing Pump Station reconstruction in Yangtze-to-Huaihe Water Diversion,systematically analyzes the seepage problem in foundation pit dewatering through field tests and numerical simulation.Based on on-site pumping test data,the hydrogeological parameters of main aquifer in foundation pit are obtained,and a three-dimensional seepage model for the project area is constructed.The optimization research of the foundation pit dewatering plan before and after the closure of cut-offwall during construction period is carried out,and the layout forms of cut-offwall and dewatering wells is finally determined.The results show that the permeability coefficient of main aquifer in project area is 1.5×10-2 cm/s,the drainage volume of foundation pit before the closure of cut-offwall is 14 532 m3/d.While after the closure of cut-offwall,with the seepage control scheme of cut-offwall and dewatering wells,the drainage volume is 9 299 m3/d,primarily coming from the precipitation outside the wall.The analytical solution and the calculation results from the three-dimensional seepage model are well consistent,indicating the high credibility of the calculation results.This study provides insight and example for optimizing the dewatering plan design of foundation pits in sluice station.
Yangtze-to-Huaihe Water Diversion Projectpumping testseepage controlnumerical model
万方数据
维普
