Research On Stability Of Soil-Rock Slope Base On Microscopic Mechanism

Soil-rock mixture, as a special kind of geological material, is different fromconventional soil and rock materials. Many scholars have conducted comprehensivestudies on the mechanical properties, seepage characteristics, deformation responsebehavior and failure mechanism of soil-rock mixture and made fruitful achievements.The mesoscopic features of soil-rock mixture, such as material composition and fabriccharacteristics, account for the internal factors that affect the stability of slope.Therefore, studies regarding the material composition and fabric characteristics ofsoil-rock mixture and their influences on slope stability are of great importance andalso considered a frontier subject for geotechnical discipline. So far, studies regardingthe stability analysis of soil-rock mixture slopes have still been involved in amacroscopic and continuous media fashion. Researches regarding the soil-rockmixture slope stability based on its mesoscopic mechanisms are rarely reported. Inview of this, based on taking into account the mesoscopic structure and contactcharacteristics of soil-stone interface, this dissertation presents a non-linearelasto-plastic constitutive model to study the stability of slope. Flowing findings arediscovered.1. By employing multi-techniques, including statistics, geometry and stochasticsimulation methods, the spatial distribution characteristics of soil-rock media withinslope are considered. The mesh generation system for mesoscopic structure ofsoil-rock mixture slope is developed independently. Meanwhile, the code is developedto enable the conversion of meshes to common software. These work paves way forestablishing mesh for mesoscopic simulation of soil-rock mixture slope.2. To properly model the mechanical characteristics and soil-rock mixture, theMohr-Coulomb yield criterion based non-linear elasto-plastic constitutive model isproposed. Afterwards, the presented non-linear elasto-plastic constitutive model isincorporated into finite element codes using complete implicit backward Eulermapping algorithm. A case study is then conducted to prove the correctness of the presented model.3. The above mesh generation system and presented non-linear elasto-plasticconstitutive model are then used to analyze slopes under different degrees of stoneproportion. The soil-rock contact characteristic is considered as well. Further, thesoil-rock mixture slope stability is studied based on mesoscopic mechanism. Theresults show that the slope stability will be better with the increase of stoneproportion.