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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。
Emergency management of major geological disasters in the disaster areas hit by Wenchuan Earthquake is under way. As one of the focuses of work, the dangerous rock masses have received considerable attention, and stability analysis is an important indicator of disaster management. In this paper, the pore water pressure of the rock mass is taken as the prerequisite to analyze the rock mass under different earthquake magnitude, different slope height, different slope angle, different structural face inclination and different physical and mechanical parameters of structural plane Safety factor, analyze the impact of these factors on the stability of dangerous rock mass. The analysis shows that under the condition that the rear edge of the dangerous rock body has tension cracks and considering the pressure of fissure water, the sensitivity of the factors affecting the stability of the dangerous rock mass is in the order of slope height, internal friction angle, slope angle, structural plane Inclination, earthquake, cohesion. The research results have certain practical significance for the ongoing investigation and design of geological disasters in the disaster areas hit by Wenchuan earthquake.