Study On Excavation Stability And Reinforcement Of Underdip Soft Rock Slope

The bedding rock slope is that kind of slope,of which the inclination direction is correspondent to rock stratum’s inclination direction,and the slope structure type often encountered in the construction.Slope inclination is less than or equal to the slope of the forward slope due to its easy slip characteristics(especially the rock slope is less than the slope angle),has carried out a lot of research.From the limit equilibrium theory,the bedding slope is stable when the dip angle is greater than the slope angle,but in recent years,some such steeply inclined bedding soft rock slope in the excavation process there is instability phenomenon,so this article relies on typical underdip slope along the slope in Chongqing to reveal its deformation mechanism and stability of the state.In this paper,the steep dip angle soft rock along the north and south recirculation channel of Chongqing West Station is taken as the research background.Based on the analysis of field investigation and survey data,combined with deformation monitoring,this paper analyzes the deformation characteristics and failure modes of slope,and uses the numerical value of the slope of the slope.Simulation method,the deformation characteristics and stability state of the slope under excavation and rainfall conditions are studied,and the key points of slope reinforcement are put forward.At the same time,the design reinforcement scheme is verified and optimized.The main research work and achievements are as follows:(1)The characteristics of slope geological structure and its deformation and failure characteristics are clarified.Based on the detailed investigation of the slope excavation in the present excavation stage,the lithology,rock structure characteristics and hydrogeological conditions of rock and soil in different areas of slope are determined,and the local collapse characteristics of slope And the analysis of slope monitoring data,the failure mode of slope is described.(2)According to the engineering geological conditions and excavation scheme,the two-dimensional geologic model of 6 # slope is established.The excavation process is simulated from the original surface to the present stage without reinforcement.The stability of the slope during the whole excavation is evaluated,and the potential sliding surface of the excavation process is identified.At the same time,the influence of rainfall on the stability of the final excavation slope is simulated and analyzed.For further stability analysis and reinforcement of the case design to provide the basis.(3)Combining the local collapse characteristics of the slope,the main points of the slope reinforcement are summarized,and the simulation of the design reinforcement scheme is carried out.When the stability coefficient is 1.35,1.50,the stability of the slope is analyzed from three aspects: the displacement of the slope,the axial force of the anchor(cable)and its yield state,the bending moment of the pile and the grid.The influence of the rainfall on the stability of the slope is analyzed.The design reinforcement program is checked.(4)Based on the analysis of slope deformation and stress characteristics,combined with the results of on-site investigation of slope damage,the key parts of the grading slope are put forward,and the reinforcement effect of key part is simulated and analyzed.Contrast,optimize the design.