Selection and optimization of the control plan for precipitation characteristic landslide

The purpose is to prevent the occurrence of precipitation characteristic landslide disasters. A precipitation characteristic landslide is selected as the research object, and the prevention and control of precipitation characteristic landslide disasters are studied. First, the stability of the precipitation characteristic landslide is analyzed, and the research methods are introduced, mainly including the transfer coefficient method and Finite Element Strength Reduction Method (FESRM). Second, based on the research methods, Midas Geotechnical and Tunnel Analysis System software is used to establish a two-dimensional model for controlling the precipitation characteristic landslide under natural conditions. Finally, an anti-sliding control plan is made: The slope in the front section of the landslide is lowered, and the anti-sliding device is installed in its rear section. The results show that the stability coefficient of the slope in the front obtained by the transfer coefficient method is 1.085 and that obtained by FESRM is 1.080. The difference ratio between the two values is 0.5%. After deceleration in the front part of the precipitation characteristic landslide is done, the stability coefficient is 1.021, which is 2.8% lower than before. When the horizontal component of residual thrust is taken as 1,360 kN/m after the anti-sliding is conducted, the active earth pressure is 887 kN/m, and the horizontal component of residual thrust is greater than that of active earth pressure. The thrust value of the anti-sliding device is designed as 1,360 kN/m, and the residual thrust curve in the designed conditions is above the curve in the check working condition, this proves that the designed condition is safe. The internal forces of the anti-sliding device are as follows: the maximum bending moment is 20,123.24 kN/m, the maximum shear force is 4,881.01 kN, the maximum lateral stress is -718.44 kPa, and the anchorage depth is 859 kPa > 718.44 kPa. This shows that the depth calculation is qualified. The stability coefficient of the cross-section after the control of the anti-sliding device is 1.15, which is improved to a certain extent, but it is less than the theoretical value of 1.20 and needs to be optimized. The control plan is optimized by adding an anchor cable to the anti-sliding device. The control plan designed in this study has a good effect on controlling landslides.