安达坝址工程地质条件的初步研究

A Pilot Study on Gamda Dam Site Engineering Geological Condition

通过对地处青藏高原腹地,南水北调西线工程杜柯河安达坝址区工程地质条件的初步调查与研究,对坝区稳定、岸坡稳定、坝基稳定、坝基渗漏和河床覆盖层等主要工程地质问题进行了分析,并作出了阶段性结论:①坝段处于稳定区,坝段内水质较好,未发现水平或缓倾角的软弱结构面,可以满足混凝土面板堆石坝的建坝要求;②受F1、F2断层的影响,右岸岸坡稳定条件好于左岸;③坝基可能存在沿背斜核部、左坝肩断层破碎带集中渗漏问题及绕坝渗漏问题。

Through a pilot investigation and study on Do Qu River Gamda dam site(a part of west route project of south-to-north water diversion) engineering geological condition,the dam is located on hinterland of the Qinghai-Tibet Plateau.Ana-lyzed main engineering geological problems such as dam area,bank slope,dam foundation stability,dam foundation leakage and riverbed covering,then worked out preliminary conclusion: ①dam site is located on a stable region,water quality is rather good,no horizontal or gently dipping weak structural plane has been found,can meet the requirement of a rock-fill dam covered by concrete plates;②as influencing from faults F1 and F2,stability of the right bank slope is better than the left bank;③dam foundation may exist piping and abutment leakages along the anticline core and left abutment shattered fault zone.