西藏湘河水利枢纽大坝防渗措施研究

Study of dam anti-seepage measures for Xianghe Water Control Project in Tibet

利用GMS软件对西藏湘河水利枢纽大坝进行渗流分析,大坝单宽渗漏量在0+200和0+500处分别为0.88、0.70 m2/d,水库渗漏量为径流量的0.009%。由于河床覆盖层较厚,随着防渗墙深度的缩短,单宽流量增大、下游侧水位和出逸高度升高,防渗墙深度对坝基渗漏起着重要作用,施工过程中应严格控制防渗墙施工质量。

Seepage analysis was conducted with GMS software for the main dam of Xianghe Water Control Project in Tibet.The seepage per unit width at pile No.0+200 and 0+500 are 0.7 m2/d and 0.88 m2/d respectively.The leakage of the reservoir is 0.009%of the runoff.Due to the thick overburden layer on the riverbed,with the decrease of the depth of cutoff wall,the unit-width discharge increases,downstream water level rises and the escape height increas⁃es.The depth of cutoff wall plays an important role in dam foundation leakage.The construction quality of the cutoff wall shall be strictly controlled during the construction process.