Mechanics Characteristic Analysis And Application Of Slope Considering Anisotropic Of Jointed Rock Mass

Large numbers of joints with different scales usually distribute complexly in slope rock mass. The joints lead to the mechanical property of rock mass anisotropic. Therefore it would be relatively larger deviations from the actual if the anisotropic property were ignored. For extremely complicated rock mass structure, in practice, the main factors that have great effect on rock mass deformation and failure are taken into account of to research its macroscopic mechanics characteristics by some scientific method.In order to investigate the influence law of mechanics characteristics of slope caused by joint distribution, the jointed rock mass was equivalent to anisotropic elastic-plastic solid based on the equivalent continuum model. Then the anisotropic seepage-stress coupling model was established. What's more, mechanical characteristics of slope considering anisotropic of jointed rock mass were researched by numerical simulation. Also an application example was analysed using the method. The main research works and conclusions are summed up as followed.1. Engineering rock mass quality classification, determination of rock mass parameters and numerical modeling of rock mass were summarized in this paper. And then main problems of the present engineering application of the above were analysed. Also the research ideas and research contents of the paper were determined.2. Based on the assumption that there is a superiority direction in jointed rock mass the seepage-stress coupling model of anisotropic rock mass was established under plane strain condition. Moreover a numerical method for mechanics characteristics of slope was put forward based on FEA software COMSOL. And then the distribution of stress field, displacement field and seepage field of slope considering anisotropic of jointed rock mass were analysed by numerical simulation. Therefore the damage failure regularity of slope was researched according to the isotropic Mohr-Coulomb and maximum tensile stress failure criterion. The results show that mechanics characteristics of slope are controlled by the superiority direction. And the anisotropic property can not be ignored in mechanics behaviors of jointed rock masses.3.Taking the case of the south wall of Fushun west open pit, parameters of engineering rock mass were determined using jointed network model of rock mass on the basis of experimental results of rock mechanics in lab, field test of structural plane and field permeability test. Besides REV scale effect of rock mass was considered. Then the anisotropic numerical model of E1200 profile of Fushun west open pit was established. Furthermore it was compared with the traditional isotropic model by numerical simulation. The results show that the water table solved by using anisotropic model is closer with the actual. And the damage evolution of slope accords to the actual too. However results solved by using isotropic model are lager difference with the actual. In another word the anisotropic model has a good prospect of engineering application.4. Mechanics characteristics of 3D slope were researched preliminary. So that the 3D transverse isotropic model of layer rock mass slope was established by taking an open pit slope as research background. And then the slope damage zone in different rock formations angle was simulated based on the 3D Hoffman anisotropic failure criterion introduced in the paper. The results show that damage failure occurs more easily of the dip layered rock masses, but it will occur more hardly of the anti-dip layered rock slope which may have some small range damage but is overall stability.