| Our country is a mountainous country, the country is also widespread landslides,statistics show that China has a new and old landslide approximately300,000, of whichapproximately15,000disastrous. In recent decades, human engineering activities morefrequent, more and more large-scale, slope stability problems encountered more and moreprominent, especially in rail and road construction. Due to the complex geology, terrainconditions encountered a lot of landslide problems, to the construction of safe productionposes a serious threat and harm, casualties and property losses caused by landslides isshocking,So before construction is necessary to correct the stability of landslide preventionprogram evaluation and research analysis.This paper by HongChun town LaoJie landslide as the research object, summarizes thegeological environment background of landslide area, the qualitative analysis LaoJie landslideformation reasons, on the basis of the quantitative evaluation of the stability of the landslide,and carries on the numerical simulation and management scheme design, briefly describes itsconclusion are as follows:(1) LaoJie landslide is located in the HongChun town，Ziyang, long300m, width70~115m, main slide body thickness0.5~30.0m, an average thickness of14.0m, the main slipdirection153°, slippery body size of about3.0×105m3, mainly for residual soil and bedrock,consisting of four landslides, complex geological structure, is a medium-sized eluvial layercomposite cutting and chipping rock landslide.(2) Rainfall is the main external factor of the landslide formed after rainfall surface waterdirectly into the ground or through cracks in the trailing edge of the landslide landslideinfiltration, less runoff, flowing directly from the slide surface; presence of rainfall led toweak interlayer effect on the stability of the landslide is large, while the people in the toe ofthe slope stability of the excavation also have a huge impact. (3) Using the limit equilibrium method for stability analysis of landslide is: in the dryconditions of stability coefficients ranged between1.12to1.15, in a steady state; stabilityfactor in the heavy rain saturated conditions ranged from0.84to0.98condition, deformationand sliding in the state.The remaining decline in landslide natural saturation force of about1050kN/m, the remaining decline in state power in the storm about1190kN/m. Thecalculation results agree with wild macro judgement conclusion, shows that the landslideunder the condition of drying conditions in a stable state, under the condition of the heavyrain saturated condition in deformation and sliding condition, require reinforcement.(4) LaoJie landslide in HongChun town were obtained by numerical simulation usingGeo-Slope software:landslide stability is better under the natural state, the overall basicstability, landslide under the condition of the condition of rain saturated condition overallinstability probability.(5) LaoJie landslide in HongChun town governance program optimization, raisedprimarily for anti-slide pile retaining+slope vivo and in vitro drainage optimization program,experience count landslide stability meet the design criteria,experience count, after Landslidestability to meet the《landslide control engineering design and construction technologynorms》claim. |
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