Stability Appraisal And Prevention Research Of Tian Ta Cun Landslide In Huang-yan Freeway

The development of China’s highway construction is more and more rapid, it is faced with problems of analysis and control the landslide stability more and more. In particular, the construction of highways in complex geological conditions mountainous are more prone to landslide disasters.The National Highway paper Baotou to Maoming line Huangling to Yan’an, Shaanxi border expansion Tower Village Tian highway landslide as the background, using of engineering geology, structural mechanics and Numerical simulation methods for engineering geological conditions of landslides were analyzed,on the basis of proposed sound engineering control measures for the landslide and its similar landslide provide a reference in the future.The main results as follows:Combined with the landslide geological environmental background and the basic characteristics and deformation characteristics basic characteristics of landslide, it is concluded that the groundwater is barrier in the upper layers of soil and water leaches of clay layer in the rainfall,.It is not easy to form soft sliding surface, it is difficult to traction slide for upper loess strata along the interface of stone and earth occurred.The results of qualitative analysis is that the landslide is in a stable state regardless of the status in the natural course or a saturated condition, and with unbalanced transfer coefficient method for the four main sectional landslide is calculated that when no excavation regardless of natural or saturation safety factor greater than 1.20, after excavation whether natural or saturated after excavation safety factor of less than 1.00.It is simulated by numerical simulation that the landslide of the no excavation state indicates that there is a risk slider sliding along the sliding surface is small. It is simulated by numerical simulation that the landslide of the excavation state indicates that that the landslide stability excavation will have a very big impact, especially in the role of water fell body along the slip surface is a moving downward trendAccording to the usual landslide treatment engineering principles and engineering measures, landslide engineering geological condition and the results of evaluation of the stability were analysed and researched Systematically, the design theory and calculation method of the anti slide pile are proposed.According to the treatment scheme of the anti slide pile, it is established geological model by FLAC3 D software in comprehensive control measures and consider the role of water is water saturated state established geological model and it is simulated the stable state of the landslide,it is evaluated for control measures of the existing landslide.