自强水库库区工程地质评价与坝线选址研究

自强水库位于陕南秦巴山地中低山地貌区,水库为镇巴县备用水源地及旅游观光风景区,属小(1型水库。通过对库坝区地质构造、地层岩性、岩溶发育等工程地质条件分析可知,对工程建设及坝线选址有影响的工程地质问题主要为库区内发育逆冲叠瓦小断裂以及岩溶发育可能导致水库渗漏等。库区内无大型活动性断裂构造,构造较为稳定,且库区蓄水范围小,蓄水量不大,不易诱发地震。而拟选坝址位于自强河段,沟谷对称顺直,综合水库坝址区地形地貌、工程地质等条件进行坝线比选,推荐下游坝线为较为理想的坝线位置,可满足工程建设要求。

Study on Engineering Geological Evaluation and Site Selection of Dam Line in Ziqiang Reservoir Area

Ziqiang Reservoir is located in the middle and low mountainous landform area of Qinba Mountain in southern Shaanxi.The reservoir is a reserve water source and tourist scenic spot in Zhenba County.It is a small(1)type reservoir.Through the analysis of engineering geological conditions such as geological structure,stratum lithology and karst development in Kuba area,it is known that the engineering geological problems affecting the construction of the project and the site selection of the dam line are mainly the development of the thrust and small faults and the karst development in the reservoir area.It may cause leakage of the reservoir.There is no large active fault structure in the reservoir area,the structure is relatively stable,and the storage area of the reservoir area is small,the water storage capacity is not large,and it is not easy to induce earthquakes.The proposed dam site is located in the Ziqiang River section,the valley is symmetrical and straight,and the dam line comparison is carried out under the conditions of topography,engineering geology and other conditions of the comprehensive reservoir dam site.It is recommended that the downstream dam line be an ideal dam line position to meet the engineering construction requirements.