危岩稳定性定量评价研究

Study on Quantitative Evaluation of Perilous Rock Stability

危岩稳定分析方法很多,基于静力平衡的定量分析方法由于具有成熟的理论基础,给出确定的稳定系数,是目前危岩稳定性评价和防治设计的主要方法,但静力平衡的定量分析方法有其自身的局限性。针对静力平衡定量分析方法存在的问题,在充分考虑危岩特征、静水压力和地震力的基础上,对不同类型,不同主控结构面组合危岩稳定性,研究得出了孤立式、软弱基座式、楔块式、倾倒式、贴坡式和悬挂式等不同类型危岩的稳定系数计算方法,并根据稳定系数对危岩进行分级。利用研究的计算方法对典型危岩稳定性进行了计算与分级,结果表明与实际情况一致。所得成果为危岩稳定性分析提供了理论依据,也为危岩防治设计提供了参考。

There are lots of methods to analyz stability based on static equilibrium, due to its mature theoretical of perilous rock, in which the quantitative analysis basis with the definite stability coefficient offered, is the major method used to evaluate the stability and to design the control scheme at present; however, this method has its limitations yet. This paper, in relation to these limitations and giving full consideration to the rock features, hydrostatic pressure and earthquake force, aimed at the stability of perilous rock in different types and with different control fissure combinations, studied and found out the methods calculating the stability of perilous rock in isolation, soft foundation, wedges, toppling, slope attaching and hanging modes, respectively, and then classified the rocks according to the stability coefficient. By use of these calculating methods, the stability of typical perilous rock was calculated and graded, and the results obtained show the conformance with the acutal situation. The study result offers the important theoretical basis for the stability analysis of perilous rock, and may be referred to in the control design thereof.