龙口水利枢纽主要工程地质问题

The Main Engineering Geological Problems of Longkou Water Control Project

库区渗漏、坝基深层滑移和承压水“顶托”影响是龙口水利枢纽存在的主要工程地质问题。库区渗漏为岩溶裂隙-散流形式,渗漏量3～6m3/s,基本不影响水库效益。坝基软弱夹层发育,在对夹层详细分类基础上,对坝基深层滑移边界条件进行了分析,提出了软弱夹层抗剪强度指标建议值。河床坝基存在两层承压水,依据含水层水文地质特征,对其工程影响进行分析,提出了合理可行的工程处理建议。

The main engineering problems existed in Longkou Water Control Project is the seepage in reservoir area, the slip in deep layers at dam foundation and the “jacking” of confined water. The seepage in reservoir area is the karst fissure in the scattering type and the seepage quantity is 3~6m3/s and it basically does not influence the benefit of the reservoir. The soft interbedded layer in dam foundation is well developed, therefore, on the basis of sorting the interbedded layer in detail, the analyze is done for the boundary condition of deep layer slip at dam foundation and put forward the proposed value for the shear strength index of soft interbedded layer. There are two layers of confined water existed at dam foundation on riverbed. According to the hydrogeological nature of water-bearing bed, the analyze is done for the influence of the project and the reasonable and feasible proposal for treating the project is put forward.