西南某电站坝区岩体质量分级与评价

Classification and Evaluation of Rock-Mass Quality in Damsite of a South-Western Hydroelectric Station

根据坝区工程地质条件，分析了影响地区岩体质量的控制因素，即岩石性质、岩体结构及其赋存条件三方面，并具体用岩石单轴饱和抗压强度Ｒ、岩体结构系数Ｔ、岩体完整性系统Ｋｖ和岩体透水性系数Ｗｋ表征，提出了反映坝区地质条件的总体质量指数Ｚ（Ｚ—ＲＴＫｖＷｋ）分级系统，将坝区岩体共分五大级Ａ亚级，据分级结果将坝肩可利用岩体范围进行了研究及判别。

Analysis shows that controlling factors affecting rock-mass engineering geological quality of damsite are rock's property, rock-mass structure, and their existing condition.They are expressed as rock uniaxial compressive strength R, coefficients T, Kv,op of rock-mass structure, integrity and perviousness. We put forward that index Z of rock-mass quality classification (Z=R T Kv ωk) and classify the rockmass into 5 degrees and 8 secondary degrees. According to these cassification results, we determine the range of rock-mass near dam abutment at different levels.