新疆青河县阿和塔斯水库坝基工程地质问题研究

Research on Engineering Geological Problems of Ahetas Reservoir Dam Foundation in Qinghe County

新疆青河县阿和塔斯水库校核洪水位1 423.34m,总库容939×10^(4)m^(3);设计洪水位1 422.36m;正常蓄水位1 421m,相应的库容532×10^(4)m^(3);工程等别为Ⅳ等小(1)型工程。主要地层为奥陶系哈巴河群上亚群(O_(2-3)^(hbc))黑云紫苏斜长片麻岩。针对新疆青河县阿和塔斯水库坝基的特点,分析坝基黑云紫苏斜长片麻岩岩石(体)的矿物组成、风化特征、渗透性、物理力学性质等,并对其进行坝基岩土体工程地质分类,探讨边坡稳定、坝基渗透、绕坝渗漏等工程地质问题,得出该岩体建坝的可行性。

The check flood level of Ahetas Reservoir in Qinghe County is 1423.34m,with a total storage capacity of 939×10^(4)m^(3).The design flood level is 1422.36m.The normal water level is 1421m,and the corresponding storage capacity is 532×10^(4)m^(3).The engineering grade is Ⅳ small(1)type.The main formation is biotite-basalt plagioclase gneiss of the Upper Subgroup of Habahe Group of Ordovician(O_(2-3)^(hbc)).According to the characteristics of the dam foundation of Ahetas Reservoir in Qinghe County,the mineral composition,weathering characteristics,permeability,physical and mechanical properties of biotite-violet plagioclase gneiss rock in the dam foundation are analyzed,and the engineering geological classification of dam foundation rock mass is carried out.The engineering geological problems such as stability of the slope,seepage of the dam foundation and seepage around the dam are discussed,and the feasibility of dam construction of the rock mass is obtained.