| This paper systematically analyzes the environmental and geological conditions and the characteristics and formation mechanism of landslide disasters in Xin County,Xinyang through the methods of engineering geological exploration and engineering geology analysis.The limited equilibrium method is used to calculate the stability of the slope in this area,which is then discussed and analyzed deeply so as to put forward a reasonable supporting scheme.The finite difference software FLAC3 D is used to simulate the typical landslide profile in this area and evaluate its overall stability as well as its supportive and preventive effects under different conditions.In this paper,the 2-2 section of slope is selected for design and analysis.The analysis of the stability of the landslide body by using the limited equilibrium method shows that the safety factors of landslide body under natural conditions and heavy rainfall condition are 1.26 and 1.03 respectively.The landslide body is under the state of metastability.The stability analysis of the landslide body is carried out with the strength reduction method of finite difference software Flac3 D.The safety coefficient of the landslide body calculated under natural conditions and heavy rain conditions are respectively 1.25 and 1.04,which are verified with the limit equilibrium method.Under the support of the anti-slide piles in design,the safety coefficients of landslide body under natural conditions and heavy rain conditions are 1.32 and1.11 respectively.The landslide body is in a stable state,which shows that the anti-slide pile support effect is obvious.Under natural conditions,the maximum displacement of landslide body distributes in the upper part of the landslide,which is located in the upper part of the top of the landslide zone.The concrete manifestation is that the upper part of the landslide body shows the movement form of the sliding landslide,and the displacement decreases from the upper part of the landslide to the lower part of the sliding body.The sliding body of the middle and lower part of the displacement changes have faults,showing traction landslide movement form.The slide body displacement distribution showed obvious segmentation,greatly affected by the surface morphology of the larger slope.There is a clear difference between the slide zone and the part of the monitoring point of the landslide bed.The slope changes with the slide zone,and the displacement of the slide zone and its upper slide part is more obvious,while the displacement of the slide part below the slide zone is close to zero.The variation of horizontal and vertical displacement of foundation pit is consistent with the change of overall displacement.The increment of shear stress in the slope mainly occurs in the landslide zone.In the natural state,the scope of the shear zone is mainly distributed in the upper and lower sections of the landslide.The increment of shear stress in the middle of the landslide zone is zero.Under the action of heavy rainfall,the upper and lower sections of the slippery belt have a run-through trend,and the stability of the landslide body is obviously reduced.The double-row anti-slide piles arranged in the middle and middle and lower parts of the landslide body are superior to the natural state and the single-row anti-slide piles in supporting effect,Single-row anti-slide pile can achieve effective support for the stability of landslide.In the comparison of different supporting positions,it is found that the double-row piles in the middle are relatively small in deformation and increased in shear stress compared with the double-row piles in the middle and lower parts.In terms of overall stability,the middle-lower double-row piles are slightly better than the central double-row piles.This study aims to provide suggestions for the research of the landslide disaster management in this area. |
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