Study On The Stability And Remedical Measures Of Deposit Landslide On The Exit Of Nanyuegou Chasm Tunnel

The deposit landslide on the exit of Nanyuegou chasm slide locates in the crucial section of this tunnel, which influences the completion of the Sankai Super Highway. It is typical for its origin reasons, deformation failure mechanism, and geometry boundary conditions. With investigation into the geologic environment and deformation characters, divide the landslide into upper and lower parts, and the study shows that the shallow layer landslide comes into being as the coming into action of parts of the ancient landslide, because of the excavation of highway side slope in the shallow layer deposit landslide on the upper part of the deep layer ancient landslide.After analyzing stability, draw the conclusion that the shallow layer landslide is in the unstable condition, and the deep layer landslide's stability declines because of the dragging of the evacuation of highway's side slope. In order to control the landslide, synthesis engineering means must be used. Analyze the adaptation of the engineering remedy measure combinations, and these measures have been proved having good anti-slide effects by numerical calculations.In order to solve the problem that the vertical force is larger than the admissible anti-shear force in the slice division plane, use the transmit coefficient method to make corrections. The safety coefficient is taken into consideration for analyzing the sliding face by the piles and transmit-coefficient slice method is introduced when studying the sliding force. The formula deduction and program design are based on the condition when pre-stressed anchor and the anchor cable reach concordance. By using these programs, the structural and internal force of the pre-stressed anchor cable anti-slide pile is calculated and a reasonable pre-stressed value has been gained. The result has been proved by numerical analysis.