格兰德水库坝址工程地质条件评价

Evaluation of Engineering Geological Conditions in the Dam Area of Grand Reservoir

通过对厄瓜多尔格兰德水库坝址地形地质条件、坝基覆盖层、坝基岩土体变形、坝基抗滑稳定、坝基及坝肩渗漏、坝基土液化等主要工程地质问题进行分析与评价,认为坝基覆盖层软弱且存在地震液化问题,需进行加固处理;两岸山坡覆盖层具分散性和中等透水性需作清基处理;两岸坝肩、坝基及岩体表层呈中等透水性需进行防渗处理。

Based on the analysis and study of engineering geological conditions of the dam site in Ecuador Grand reser-voir,the major engineering geological problems are analyzed and evaluated,such as the dam site topographic and geolog-ical conditions,dam foundation covering layer,dam foundation rock and soil deformation,anti slide stability of dam foun-dation,dam foundation and abutment leakage,dam foundation soil liquefaction,etc.Results show：the covering layer of the dam foundation is week,and has a problem of seismic liquefaction,it should be reinforced;the covering layer of both hillsides have dispersty and medium permeablitty,it must be cleared;medium permeability exist on dam foundation,both abutments and the surface of the rock,that need anti-seepage treatment.