Study On Mechanism Of Deformation And Stability Of Da Han Landslide In Yu Xiang Expressway

The stability of landslides has long been and still is an important problem, which needing research in the geotechnical field. The problem of landslide stability is involved the security of many engineering projects in various sectors. As natural geological hazard, it is affected by many uncertain factors, include environment and geology conditions. In the nature, slope is always in the stability condition. But when it effect by the storm or human activity, it will slide. In order to protect people’s lives and their properties, before slope begin to slide, it’s need to adopt an effective reinforcement measure, to prevent more develop.The Paper do research on stability appraisal of landslide under Complicated geology conditions, and put forward an effective treatment. The main work of this paper contain:The paper introduced now domestic and international in slope stability research, consolidate punish level and develop tendency, put forward the importance and necessity of slope stability mechanism research.Do the research on the geology condition, hydrology condition, landslide characteristic, landslide cause. The result show that landslide produced on the interface of rock which belong to pull type landslide. The Dahan landslide was duo to the rainfall and the artificial excavation, which were induced the first deformation of the slope toe and resulted the tension fissure in the back of slope. Massive Surface water infiltrated along the crack, causing the unit weight increase of sliding body.And the shear strength of sliding zone soils were reduced by karst water supply, leading to the formation of the traction type multistage landslide failure, if not control, may continue to develop back.The paper do qualitative and quantitative research on landslide stability. Depending on Dahan landslide, do research on stability analysis and comprehensive treating. The paper applied the coefficient transmits method to do research on stability analysis, calculating results show that the landslide is stabilization in nature, it will slide by rainstorm or artificial activity.Using Slope/W and Seep/W software for numerical simulation of the landslide, the slope stability was analysed before and after the state of excavation, the simulation results show that:the natural slope was stable before the state of excavation; under the influence of human engineering and rainfall conditions, the excavated slope became instability with the creep slip. At the same time the landslide stress, displacement deformation were conducted to be analysed. The results were basically consistent with the actual landslide, indicating that artificial excavation and torrential rain were the main causes of landslide.Through calculation and simulation show that the governance programs can effectively control the deformation of the landslide, and be a good effect treatment for the stability of the slope.By the stability analysis, considering all the design specifications, proposed a suit of the control programs. It turns out that it is important of the slope stability of the construction.