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In previous studies, most of the studies are based on the failure mechanism of the landslide deformable body on tunnel and the safety monitoring and early warning after the completion of the tunnel, while there is less research on tunnel construction. In order to study the comprehensive treatment of the deformable body of the ancient landslide in the giant deep rock bedding better, the treatment of JM tunnel landslide deformable body was selected to carry on the empirical study. After a detailed analysis of the geological characteristics of JM tunnel engineering landslide, the stability analysis of the landslide and the deformation body and the calculation of the thrust value based on the FLAC model were carried out on the basis of the monitoring data. After the construction of the model, the intensity parameters of the slip mass deformation and the sliding zone were obtained from the back analysis. On the basis of the above, the comprehensive treatment scheme for the rear side of the old landslide deformation body was determined, including earthwork cleanup, grading supporting, and the back pressure by abandoning the cleaned earthwork at the leading edge. The study is of great significance to the design of the construction of undercrossing tunnel of landslide under the complicated geological conditions.

The Comprehensive Treatment of the Ancient Landslide Deformable Body in the Giant Deep Rock Bedding based on the FLAC Analysis Model