黄家沟水库坝址区工程地质条件分析与坝型优选

Analysis of Engineering Geological Conditions of Dam Foundation and Dam Type Optimal Selection in Huang Jia-gou Reservoir

针对黄家沟水库建坝河段存在河床覆盖层较厚、坝基岩体节理裂隙发育等可能影响建坝成库的不利地质问题。结合建坝河段优选结果,从地形地貌、地层岩性、地质构造、防渗处理等方面,对上、下坝址的地质条件进行详细论证分析,优选地形地质坝型适宜性好、建筑物布置紧凑、技术经济性较优的上坝址混凝土面板堆石坝方案。工程地质条件评价论证为水库枢纽布置及建筑物结构体型优化提供了翔实的地质评价结论和支撑数据,确保设计方案具有较高工程匹配性和技术经济性。

Aiming at the adverse geological problems that may affect the reservoir formation of Huang Jiagou reservoir, such asthick riverbed overburden and joint fissure development in the dam foundationrock mass, combined with the dam construction river section optimization results, theupper and lower dam sites′geological conditions have been detail demonstrated and analyzed from the aspects of topographic features, formation lithology, geological structure and anti-seepage treatments.And the design scheme of concrete face rock-fill dam at the upper dam site with good suitability of topographic and geological dam type, compact building layout and excellent comprehensive investment has been proposed. The evaluation and demonstration of engineering geological conditions can provide detailed geological analysis conclusions and supporting data for the reservoir hub layout and the building structure optimization, so as to ensure the design scheme has high engineering matching and technical economy.