链子崖危岩体裂缝生成机制和发展过程的地质力学模拟

GEOMECHANICAL MODELLING ON THE MECHANISM AND DEVELOPING PROCESS OF CRACKING AND DEFORMATION OF LIANZI CLIFF DANGEROUS ROCK BODY

本文介绍了采用地质力学模拟对链子崖危岩体进行的研究，讨论了模拟长江下切和煤层开采的地质力学效应，探讨了危岩体变形趋势和防治对策。模拟试验结果表明，长江下切、岩体卸荷是主要的生成机制，而坡脚煤层开挖则加剧了它的发展。试验揭露了岩体张裂和倾倒趋势，为整治加固设计提供了重要的依据。试验结果还表明，链子崖危岩体所具有的陡缓结构面交切结合的岩体结构起着决定性的控制作用。

In order to design engineering measures for stabiliting the Lianzi Cliff dangerous rockbody to mitigate the geo-disaster, it is really necessary to study the mechanism and developing process of large-scale cracking and deformation, and on this basis, to evaluate its stability. One of the diffective approaches to the study of rock mass deformation is the geomechanical modelling which can demonstrate the nature of the deformation process. The model tests show that the stress releasing during river bed cutting down is the major background of rock mass cracking, but coal mining is responsible for intensifying its cracking and large deformation.The cracking mechanism and toppling-rotation trend were shown by the model experiment.The results of modelling can provide a basis for the engineering design.The rock amss structure,characterised by intersection of steep dipping joints and subhorizontal weak seams,plays an important role in the deformation.