黔中水利枢纽一期工程区岩溶发育模式及水库防渗研究

Karst development models and reservoir anti-seepage design in a hydro-junction construction site in Qianzhong district

摘要: 黔中水利枢纽一期工程区河流深切割,地层呈典型的、且具普遍性的多层状碳酸盐岩岩组结构。受岩性控制,溶蚀作用一般仅在碳酸盐岩岩层内进行,岩溶顺层发育呈多层状,并由于岩层倾角的原因岩溶在两岸具较大差异。在无特殊条件破坏情况下,层间非碳酸盐岩岩层成为相对隔水层,是水库防渗的良好依托。工程区所遇断层F3为压性断层,未破坏多层状的岩溶系统结构,但层间岩溶塌陷使得多处层间隔水层遭受破坏,岩溶越层发育,对水库防渗极为不利。进一步的分析表明,枢纽坝区可能的大渗漏部位及防渗设计主要在大坝两坝肩附近。

Abstract: The rocks in a hydro-junction construction site in Qianzhong district are carbonate and deep cutted by river,which is very common in this region.Controlled by lithology,the corrosion is going on only in carbonate rocks layer and therefore the karst is multilayer,and the non-carbonate rocks layers are good confining beds,which is very good to anti-seepage.The fault F3 in the dam site is compression fault and has no damage to the multilayer karst system.However,this causes some of the w...