| Our country western deep valley area development a lot of deep accumulation landside Its gestation complicated geological conditions, slope structure is loose, in the river erosion, rainfall, earthquake action effect easily induced deformation. However, the deformation mechanism and the key factors of the resurrection deformation under different terrain conditions, geological structure and influence factors are often different, and there are big differences. This paper in Lixian County Xishan village landslide as the main object of study, through data collection, field survey, exploration, test and indoor numerical simulation analysis method combining of the revival deformation mechanism and stability, this paper studied the extracting the revival and deformation are key inducing factors. The purpose is to provide basic research for the establishment of this kind of landslide deformation and revival of identification index system. The main results of this research are as follows:(1) Xishan village landslide is located in Lixian County Tonghua Township, Zagunao River left, belongs to the alpine terrain to.There are only a few faults in the region, and only one fault passes, that is, the stone fault. Seen in the region is mainly grey rock and Silurian phyllite of Maoxian group, according to the drilling revealed, terrane changes greatly. And its upper deposit is mainly the collapse slope product and ice water accumulation. The main accumulation of the debris and gravel soil, the average thickness of about 55 m, belonging to the deep accumulation of landslides. Landslide plane form is a chair shaped, the profile of a ladder, on the terrain is mainly "steep-slow-steep" form.(2) Refer to the relevant literature and data collection, understanding of the county area of regional geological environment survey, combined with field survey, summed up the Xishan village landslide engineering geological characteristics and landslide body matter partitioning and zoning characteristics of deformation, combined with the monitoring data. The landslide deformation mechanism of the engineering geological analysis, induction is creep cracking deformation, the deformation mode of development performance for step by step back.(3) The weight of the landslide was 18.3KN/m3 and the average permeability coefficient was 1~2m/d by the large severe, osmotic test and the mechanical property test. The measured landslide in the natural state, the shear strength is C=24.25, diameter =36.92, shear strength was C=14.2 saturated, Phi =30.55. It can be seen that the internal friction angle of the sliding body is greatly affected by the increase of the moisture content, and the internal friction angle of the sliding body is reduced, while the internal friction angle is less affected, and the internal friction angle is reduced by about 6.(4) According to the seismic intensity, through access to information from the 50 years beyond the probabilities of 63%, 10% and 2% of the peak earthquake acceleration respectively(0.04 g,0.15 g,0.5g) and by the calendar year in the area of statistics of rainfall data, Lixian County, Tonghua Xiang area for nearly five years, the average hourly rainfall, combined with literature review, select the relevant formula of calculating rainfall return period, return period for 10 years, 20 years, 50 years, 100 years of rainfall intensity, respectively(35.4mm/h,41.3mm/h, 48.7mm/h 54.5mm/h). And of the landslide were analyzed, obtained Xishan village landslide deformation situation in these conditions, obtained by calculation, numerical simulation of deformation region and on the spot investigation and monitoring data are basically consistent and with the increase of seismic peak acceleration and intensity of rainfall, landslide deformation is also increasing.(5) According to the field investigation and monitoring data to extract the landslide disaster causing factors, which slope structure, topography and geomorphology for landslide deformation is the basic conditions, and rainfall, earthquake landslide resurrection critical deformation disaster causing factor. Based on the conclusion of rainfall, earthquake in key caused by influence of the landslide disaster factor two-dimensional numerical calculation, and quantitative analysis of earthquake and rainfall on landslide stability, get Xishan village landslide disaster factors and the critical value of earthquake and rainfall key in. The results show that the landslide body does not deform under the action of the key factor, and the acceleration deformation will occur under the influence of the earthquake acceleration and rainfall intensity. |
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