阿克坝址工程地质问题与评价

Ake Dam Site Engineering Geological Problems and Evaluation

详细阐述了阿克坝址区的基本地质条件,对坝址区存在的主要工程地质问题——坝基坝肩稳定性、岸坡稳定性、河床渗漏、覆盖层等问题进行了分析与评价。指出:坝址区处于稳定区内,没有发现水平或缓倾角的软弱结构面;坝段属中等切割的高山区,外动力地质现象规模较小,对工程影响不大;基岩属中等—弱透水,坝基、坝肩基岩不存在大的渗漏问题。但坝段覆盖层为砂砾石和砂层,且厚度大,因砂砾石层属强透水带,故应做好防渗处理。

The basic geological conditions of Ake dam site were discussed in detail in the paper,then primary engineering geological problems existing analyzed and evaluated thoroughly including dam foundation,abutments and bank slope stability,riverbed leakage,overburden etc.Pointed out that the dam site is lying in a stable area and there are not aclinic or flat-pitching weak structural planes.The dam region belongs to a medium dissected alpine area with smaller scaled exodynamic geological phenomena and has no major impacts to the dam engineering.Medium to weakly permeable bedrock prevented major percolating in dam foundation and abutment,but the thick and strongly permeable sandy gravel and sand overburden has to get done with water-tight processing.