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Study on Transport of Groundwater of Jinping Cascade Ⅱ Hydropower Station with Long Diversion Tunnel

ZHANG Ji-un1,REN Xu-hua1,SHU Jia-qing2,SHAN Zhi-gang3(1.College of Water Conservancy & Hydropower Engineering,Hohai University,Nanjing 210098;2.Jiangsu Electric Power Design Institute,Nanjing 211102;3.East China Investigation and Design Institute,Hangzhou 310014)  
Water outburst,which often occurs in the underground construction,is one of the problems at mountainous areas in the southeast of China.Taking the Jinping Cascade II Hydropower Station for example,the paper introduces the equivalent infiltration intensity method to simulate the rainfall infiltration,which is based on the equivalent continuous isotropic medium model.With the basic tool of three dimensional finite element method and the basic theory of groundwater dynamics,the water inflow and cone of depression in the zone,through the whole constructing process of diversion tunnel,are analyzed and studied.Under the influence of tunneling and without any supporting measures to deal with the seepage,the maximum water inflow value reaches about 26m3 per second,and the conical depression influence radius of water cone achieves about 20km.While adopting measures that can be concluded as "water blockage combined with water drainage",the quantity of gushing groundwater is decreasing,and groundwater level can be recovered,meeting the requirements of engineering construction and the surface water environment.
【Fund】: 国家自然科学基金委员会 二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50539090)
【CateGory Index】: TV672.1;TV221.2
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