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岩质陡坡后退演化是一个复杂的地质力学过程及动力地貌过程,也是山区危岩、崩塌灾害的形成机制,符合岩质边坡链式演化规律。针对单一危岩块,将危岩主控结构面类比为Ⅰ型裂纹,引入广义Kelvin蠕变模型,建立了考虑危岩蠕变效应的危岩断裂应力强度因子计算方法;针对缓倾角岩质陡坡,运用工程力学方法建立了陡坡上各危岩块所受荷载的计算方法;联合危岩主控结构面蠕变断裂应力强度因子和岩石断裂韧度,建立了危岩块崩落判据。实例分析表明,建立的岩质陡坡后退力学分析方法与实际情况基本一致。
Backward evolution of rocky steep slope is a complex geomechanical process and dynamic geomorphological process, and is also the formation mechanism of dangerous rock and collapse hazard in mountainous area, which accords with the chain evolution law of rock slope. Aiming at a single dangerous rock block, the dominant structural plane of the dangerous rock is compared to the type Ⅰ crack. By introducing the generalized Kelvin creep model, a method for calculating the stress intensity factor of the rock under the dangerous creep effect is established. , The method of engineering mechanics was used to establish the calculation method of the loads on the dangerous rock blocks on the steep slopes. According to the creep rupture stress intensity factor and the rock fracture toughness of the main control surface, the criterion of rock collapse was established. The case study shows that the established method of back-rock mechanical analysis of steep slope is basically consistent with the actual situation.