复杂构造区水库坝址比选与拱坝适应性分析OA

Datianhe Reservoir is located in a complex tectonic zone,where the"歹"-shaped tectonic belt of Qinghai-Xizang-Yunnan-Myanmar-Indonesia and the Three Rivers Tectonic Belt intersect.To ensure engineering safety and economic feasibility,it is necessary to scientifically determine the dam site and dam type.Through regional geological survey,comprehensive engineering geological comparison of dam sections,and detailed exploration of dam sites,this study systematically analyzes fault structures,rock mass structures,slope stability and seepage conditions.Based on topography,lithology,tectonic settings and hydrogeological conditions,the suitability of arch dam and core wall dam schemes is compared.The results show that the lower dam site,which avoids the main fault F1,is recommended in this study;it features a narrow river valley and relatively intact rock mass.The roller-compacted concrete arch dam is superior to the asphalt concrete core wall dam in terms of seepage cutoff length,spillway layout and construction material cost.After targeted foundation treatment,the roller-compacted concrete arch dam scheme can well adapt to the geological conditions of alternating hard and soft rock masses and well-developed steeply dipping structural planes in complex tectonic zones,with sound technical feasibility and economic benefits.