Study On The Destruction Mechanism Of The Cranny Rock Mass And The Effect Of Reinforcement

There are too many discontinue planes in natural rock mass, such as joints, layer surfaces and faultages. The instability of rock mass is not only related with the intensity of basic component of rock mass (the intact rock block), but also is mainly controlled by those structural faces.Based on the analysis of deformation properties of weak structural planes, the mechanical properties of rock mass influenced by the joints are summarized. The Monto Carlo method is used to simulate the probability structural model of joint and cranny in rock mass, according to this model, the intensity mechanism of joint rock mass is studied. The condition of expansion and destruction ulteriorly of tiny crack in rock mass acted by exterior load is presented. According to the different combination mode of joint and rock bridge, there are different cracking and perforation mode of rock bridge which lead to macro joint. The elastio-plastic incremental theoretical framework of joint is set up, subsequently the equivalent model of joint rock mass is deduced. .Secondly, on the base of deformation and destruction of engineering cranny rock mass, the anchor effect and mechanical mechanism of anchored cable are studied. On the other hand, a new numerical simulation method of anchored cable is presented in this thesis.Finally, the method presented in this thesis is applied to study the stability of Wang Ershan gold mine project, the result is agreeable, which proves the validity and correctness of the finite element method of anchored cable and the mechanical mode of joint rock mass.