天开水库渗漏计算及防渗研究

Study on leakage calculation and seepage prevention of Tainkai Reservoir

以天开水库工程的实际工况为研究平台,对库区渗漏量进行分析计算,结合在'7.21'的21 d时间段内的实际观测数据,得出整个库区渗漏量为110.1万m^3,利用公式算出库区岩溶通道渗漏量为79.08万m^3、古河道渗漏为17.63万m^3、主坝坝基渗漏为0.64万m^3,岩溶区总渗漏量为97.35万m^3。经分析认为库水经古河道和岩溶通道的总渗漏量约占整个库区渗漏量的88.4%。对比局部水平防渗、整体水平防渗、垂直防渗三种防渗处理方案,提出局部水平防渗作为最优防渗方案。

In accordance with the actual operation condition of Tiankai Reservoir,the leakage amount of the reservoir area is analyzed and calculated herein,and then it is obtained that the leakage amount of the whole reservoir area is 1 101 000 m^3 in combination with the observed data within 21 days during the'July 21'Rainstorm.By means of the relevant formula,it is calculated that the leakage from karst passage in the reservoir area is 790 800 m^3,the leakage from ancient river channel is 176 300 m^3,the leakage from the foundation of the main dam is 6 400 m^3 and the total leakage of karst area is 973 500 m^3.Through the relevant analysis,it is considered that the total leakage from both ancient river channel and karst passage is about 88.4%of that of the whole reservoir area.Comparing with the three seepage prevention schemes,i.e.the partial horizontal seepage prevention,the overall horizontal seepage prevention and vertical seepage prevention,it is proposed that the partial horizontal seepage prevention is the best seepage control scheme.