Design Theory And Numerical Simulation Research Of Treatment Technique With Reinforced Embankment For Karst Area

The distribution of karst is wide, and geological environment is complex and changeable. The collapse disaster of karst area increases frequently and usually is sudden, causes huge of loss and serious harm. Expressway often encountering karst development area, the subgrade damage caused by karst collapse occurred from time to time. It is a great of challenges to effectively treat and reduce harm.This paper lays the geo-synthetics reinforced body in the embankment to prevent the sudden collapse, thereby reducing the losses caused by karst collapse. The geo-synthetics reinforced body above collapse is divided into overhead, transition and anchor segment, and analyzed its force and force characteristics of each part. The realistic elastic-plastic models is used to simulate anchor section, guided elastic-plastic answers of anchor section by the basic equations and establish calculating process of the pull-out of endpoint in anchor section and the length of the transmission combined with the boundary conditions. The analysis results of the elastic-plastic model and the plastic model is compared through specific projects examples, and obtained error analysis of two models, then explore the impact of the different width of overhead section, the different reinforcement stiffness, the different height of the over soil, the different interface friction angle and other factors on the calculation errors of pull-out of the endpoint in the overhead section, and analysis the relationship between the length of force transfer during anchor section and the height of the over soil.It progresses numerical simulation for the situation of geo-synthetics reinforced body treating subgrade containing cave by discrete element, and simulates the deformation process caused by different design parameter. Then compares the analysis results with theory calculation analysis, because taking the surrounding soil of the reinforcement into account in the model is limited, so there are some errors between the two results. But the trend between the two results remained the same. It validates the correctness of theory calculation results.