Study On Development Characteristics And Control Countermeasures Of A Large Scale Landslide In Pingchang

Landslide is a kind of serious global natural disasters.with the rapid development of economy and the expansion of engineering construction scale,the landslide induced by human engineering activities also presents an increasing trend.Research on typical large-scale landslide,through identifying landslide range,nature and sliding surface buried depth of engineering geological conditions,analysis and evaluation of its stability,and then to study reasonable preventive measures,to provide technical support for local economic construction,especially for similar landslide prevention and control,has important practical significance.Which will destroy the whole balance of the slope,and cause whole or local deformation and failure of the excavated slope.The longitudinal length of the landslide is about 240 m,the transverse width is about 560 m,the area is about 0.13 square km,the mean thickness of sliding body is 18 m,and the total square volume is about 2,419,200 cubic meters,which belongs to the large-scale in the middle landslide.According to the landform and deformation degree,the landslide is divided into two parts: strong and weak deformation zone,which directly threatens the engineering construction and normal operation of the industrial park 3,4,5 in the industrial zone of the leading edge(at the foot of artificial cutting slope),the threat of more than 1000 people,and the direct economic loss of about 50 million yuan.On the basis of existing investigation data,combined with field investigation,through the analysis of regional engineering geological environment conditions,and detailed engineering geological investigation,the landslide range,sliding body thickness,slippery zone characteristics,deformation damage degree,damage object and development trend are found,and the genetic mechanism of landslide body is analyzed.The physical and mechanical parameters of the sliding body and soil are obtained by the test,and the stability of the landslide is calculated by the limit equilibrium method.The calculation results show that the stability coefficient of the landslide under natural conditions is 1.117 ~ 1.313,and the stability coefficient is 1.012 ~ 1.083,the main sliding part of the strong deformation zone produces the whole landslide under the rainstorm conditions,its stability is the lowest,the deformation of 1-1',2-2' and 10-10' section is weak,and the division line with strong and weak deformation areas is basically consistent with the qualitative analysis.According to the stability analysis and evaluation results,the control measures of the landslide are compared and studied,and the comprehensive control measures of " anti-slide pile wall + anti-slide retaining wall + intercepting ditch + lattice slope protection" are proposed,which can play a reference role for similar engineering landslide in the future.