危岩体稳定性快速评价方法研究

Study on Rapid Evaluation Method for Stability of Dangerous Rock Mass

针对危岩体稳定性快速评价问题,选取代表性强、现场易于收集危岩体主控结构面倾角、基座情况、地形坡度、凹腔状态、岩体结构和卸荷松弛状态等6个基本因素作为快速评价指标,在评价指标相互作用定性分析的基础上,采用关系矩阵法半定量地研究了指标之间相互作用对危岩体稳定性影响的权重和指标重要性程度,根据评价指标重要程度和权重大小,建立了定量的危岩体稳定性快速评价方法,提出危岩体稳定性快速评价的危岩体不稳定指数(UMII)方法。据此,对锦屏二级水电站闸址左岸高边坡危岩体稳定性进行了快速评价。

For rapid evaluation of stability of dangerous rock mass,six basic factors,including control fissure inclination,pedestal conditions,terrain slope,cavity state,rock structure and unloading relaxation state,which are typical and easy to be collected on site,were taken as the indexes.Depending on the qualitative analysis of interaction of the evaluation indexes,relationship matrix method was used to study semi-quantitatively the weight of index interaction effect on stability of dangerous rock mass and the importance of index;and then according to the importance and weight of the index,the method quantitatively evaluating stability of dangerous rock mass rapidly was established,and the instability index method(UMII)for dangerous rock mass was proposed.The stability of dangerous rock mass at the high slope on left bank of the lock site of Jinping Secondary Hydropower Station was hereby evaluated.