The Analysis Of Stability Evaluation And Prevention Measures For The Da Xuan Way Lao Lin Village Landslide In Sichuan Province

Landslide is one of the main geological disasters in the mountainous area highway construction.Sichuan province of xuan highway K6 + 760 m + 460- K6 LaoLin Village landslide appears more obvious deformation signs, xuan in the highway landslide in part through the proposed.Local fill will have a certain influence on the landslide, so the study of highway engineering construction and highway operation safety and security is of great significance.This article through to the LaoLin Village landslide based on field investigation, collecting relevant data, the characteristics and formation mechanism of the landslide to carry out the system of the study, by the method of qualitative analysis of landslide stability and embankment filling after the landslide failure mode and stability, at the same time, adopt the method of quantitative calculation under the natural condition, storm conditions of landslide stability and local stability, using GEO- STUDIO numerical analysis software to the natural condition and the embankment filling conditions of the landslide under the condition of stress and strain change and rainstorm under seepage field numerical simulation analysis.Based on the above research, in view of the landslide stability and deformation characteristics put forward concrete prevention measures, for the prevention and control of engineering design, gain the understanding and the main achievements:(1) LaoLin Village landslide is in the red bed sand mudstone formation of large flat bedding landslide, old plane tongue shape on the whole, the average thickness of 12 m, about 230 x 104 m3, the sliding body is given priority to with piece of gravel soils, the slide for the silty clay, slide bed for Jurassic middle SAN tin groove group mottled sandstone and shale, hydromica sliding surfaces appear linear, landslide formation mechanism for the slope influenced by the structure and function of slope unloading, at the same time, the mudstone in slope soft interlayer is cut in front in the process of the incised valley erosion wear, soften, with unfavorable geotechnical structure combination of bad geological foundation, to "slip, cracking failure mode" sliding along the weak layer deforming toward surface damage.(2) Landslide as a whole does not appear obvious deformation phenomenon, show the partition after the formation of landslide deformation characteristics of the deformation zone(1 #, 2 # deformation area).Landslide under natural state as a whole and the deformation of 1 #, 2 # deformation area is in stable condition, rainfall conditions landslide in stable state, the whole deformation area 1 #, 2 # deformation zone in the unstable state.(3) After the front of landslide seepaged, deformation zone 1 #, 2 # deformation area is not affected by seepage, stability status to change, the landslide is in stable condition, whole fill section and the following is in unstable state, under the condition of rainfall landslide in stable state, the whole embankment and the following is not a stable state.(4) For LaoLin Village landslide characteristic and fill landslide stability condition, after studied the prevention and control measures, according to the characteristics of the landslide, by adopting the combination of surface drainage + anti-slide retaining governance plan, set up outside the landslide trailing edge water drainage ditches, landslides on both sides of the drain, the filling embankment leading edge set the anti-slide pile.