滑塌式危岩体稳定性影响因素敏感性分析

Sensitivity Analysis on Influential Factors of Slip-Collapse Unstable Rock Mass Stability

汶川地震灾区重大地质灾害应急治理工作正在进行,危岩体作为其中的工作重点之一,受到相当程度的重视,而稳定性分析是灾害治理的重要指标。该文以滑塌式危岩体有孔隙水压力作用为前提条件,分析不同地震震级、不同坡高、不同坡角、不同结构面倾角、不同的结构面物理力学参数条件下的危岩体的安全系数,分析这些因素对危岩体稳定的影响。分析表明,在危岩体后缘有拉张裂隙且考虑裂隙水压力条件下,危岩体稳定性的影响因素敏感性由大到小的顺序为坡高、内摩擦角、坡角、结构面倾角、地震、内聚力。研究结果对正在进行的汶川地震灾区地质灾害应急勘察设计工作具有一定的现实意义。

The emergency treatment projects of the major geological hazards induced by Wenchuan earthquake are in progress,the unstable rock mass as one of the priorities,get by a considerable degree of attention,and its stability analysis is important index of hazards treatment.In this paper,based on the conditions of the fissure water pressure on the slip-collapse unstable rock mass,the stability has been studied under the conditions of different earthquake magnitudes,different slope height,different slope angle,different dip,and different safety coefficients in different physical and mechanical parameters of structure surface.The analysis results show that the decreasing order of the sensitivity factors of influential stability is slope height,angle of internal friction, slope angle,dip,earthquake,cohesion.The results have a certain practical significance for the geological hazards emergency investigation and design induced by Wenchuan earthquake.