Study On In-situ Shearing Testing Of Weak Joint Plane And Stability Of Consequent Rock Slope

The consequent rock slope is the stratified rock slope which has the same direction dominant joint plane with the slant of the slope. The deformation and failure mechanism of the consequent rock slope are mainly effected by the feature of the dominant joint plane. Based on the in-situ shearing testing of the weak joint plane, the deformation, failure mechanism and stability of the conseqent rock slope are studied by the mechanical analysis and numerical simulation in this thesis. Firstly, the in-situ shearing testing of the weak joint plane is carried out at the typical testing points combined with indoor simulation shear testing and empirical values. The reliable shearing strength parameters of the weak joint plane are obtained by the general comparison research. Secondly, based on the past achievement, the stability analysis of the consequent rock slope is carried out by the mechanical methods with the two typical failure models—sliding failure and flexural failure. The influence of the pressure of hydrostatic water and earthquake load is also considered in this thesis. Finally, the excavation deformation of the consequent rock cutting slope is simulated by ANSYS with the elasto-plastic finite element theory and strength-reduction theory according to the engineering practise. The deformation, the failure mechanism and the evolution process of the consequent rock cutting slope are analyzed under the gravity action. The influence of the yield criterion and flow criterion is considered and the conversion coefficients between the results from different yield criterions are calculated in the analysis. The influence of the cohesive strength, friction angle of the weak joint plane and the inclination of the rock slope on the stability is studied. The research is applied to analyse the mechanism of the consequent rock cutting slope and evolution process of failure. Some reasonable suggestions are put forward to make the design and treatment work of these slopes safer, more reliable and more economic.