灰岩地区类砌体型危岩座滑过程中突然断裂的能量解

Energy Solution for Sudden Fracture of Quasi-masonry Unstable Rock Block in Limestone Area During Sliding

野外地质调查发现灰岩地区危岩崩塌呈现与砂岩地区危岩崩塌特征不同,破坏时解体现象明显,所形成的崩塌灾害往往具有群发性,并可能产生显著的气垫效应,灰岩地区危岩的"类砌体型结构"特征是导致上述现象的主要原因。本文在构建类砌体型危岩座滑解体模型基础上,采用断裂力学分析方法和能量守恒原理建立了类砌体型危岩系统能量方程,提出了危岩体解体与否的判据,从能量角度诠释了类砌体危岩座滑过程中突发性断裂特征,并预测了望霞W2#危岩体发生解体时的座滑偏转角度为34°。本文研究成果可为评估灰岩地区危岩稳定性提供科学依据,理论和实践意义重大。

Field geological investigation shows that the unstable rock block collapse in limestone area is different from that of sandstone area. When disintegration occurs, the disintegration phenomenon is obvious, and the collapse disaster often features large areas of damage and may yield a significant air cushion effect. The rock mass structure of unstable rock block in limestone area is the main cause of the above phenomenon. In this paper, the energy equation of a type of unstable rock block system was established based on the fracture model of a type of masonry unstable rock block. The fracture mechanics method and the energy conservation principle were adopted, the criterion of disintegration or failure of rock mass was put forward, and the sudden fracture in the course of sliding of rock block was explained from the angle of energy, and the deflection angle of W2 was predicted to be 34°. The research results of this paper provide a scientific basis for scientific assessment of the stability of unstable rock block, which has great theoretical and practical significance.