Sichuan Ningnan Baishui River High Traction Type Landslide Deformation And Failure Mechanism And Its Hazard Chain

Liangshan Prefecture, Sichuan Province, by the geological structure, river cutting, and other factors, the terrain is larger, the terrain slope, many of the "V" type of alpine valleys. Affected by the terrain, the region has a small climate characteristics, short duration of concentrated heavy rainfall, resulting in the Liangshan area of the landslide, debris flow disaster prone. From June 27,2012 to June 28, Ningnan County drop heavy rain, lead to a large number of landslides, debris flow disaster in the county, caused some casualties, blocked roads, etc. Also caused the slope sliding on the right side of S212 Provincial Rd which Puge County to Ningnan County, there are about 200000 party landslide material cut out after the slope under the action of gravity along the channel toward the toe, accumulation body blocking Road. Large scale sliding again in August 16,2012, More than 700000 cubic meters landslide body cut out flow to river bed on the foot of the slope. Collapse caused by the death of 2 people,3 people missing, S212 Provincial Rd block up to 600 meters, Blackwater River blocked more than 100 meters, the river suddenly rose nearly 4 meters to form a lake, blocking traffic for 15 days. Since then, the landslide has been creeping deformation, and there have been more than 20 sliding. The safety of life and property of the 179 people who live in the back of the landslide is directly threatened by the landslide, especially in the area of the landslide of 70 households in 14. Many factories, power plants etc Assets of nearly 800000000 yuan and nearly 20000 people’s lives and property safety along the Blackwater River are under the indirect threat. Therefore, it is necessary and urgent to carry out the project management for the high traction landslide.Sichuan Liangshan White River high traction type landslide is located on the right bank of the Blackwate river, the landslide in the plane of the whole was "shovel shaped".The gorge area of the landslide is located in the high and steep terrain, slow down the steep landslide, providing free conditions for the formation of landslide,terrain is slow on the upper and steep on the down, provide free conditions for the formation of landslide. On the other hand, the steep slow border were formed stress concentration,bottom shear stress concentration is greater than the shear strength, Shear failure occurs at the foot of the slope firstly, damage to the internal development of the slope. The landslide area is affected by the fault of the wood River. The occurrence of the rock mass in the landslide area is larger, the smaller structure is more developed, and the rock mass is broken. According to the field survey, the regional landslide in 2006 at the original terrain and steep slow junction began to appear the fracturing and deformation, and the emergence of a small range of collapse. June 28,2012, The landslide sliding collapse, blocking the lower road, the trailing edge of a new free surface is formed, the leading edge of the slope deformation cracks further crack; August 16,2012,the leading edge free surface slided again large-scale, plug the the road and the river on the foot of the landslide,And formed the chair shaped sliding bed and steep at present situation. The upper sliding body to form good surface conditions, Tension crack on the slope were deformation and fracturing again, formationed multistage sill level ridge terrain. The landslide instability and sliding is by the front began to collapse sliding, in the rear traction sliding mode to rock mass deformation and failure of the formation of a new free surface.On the basis of emergency exploration in March 2013, deep displacement monitoring and surface displacement monitoring data during exploration,the overall control measures are formulated for the two step of the emergency treatment scheme of the steel pipe piles and the post anti slide piles, the monitoring data of the emergency treatment test run, the high landslide deformation is contained, on a basic stable state. In this paper, the development characteristics, forming conditions and the formation mechanism of the landslide are analyzed, and the stability of the landslide is analyzed qualitatively and quantitatively. Based on this, the high sliding form rolling stone, slope debris flow, blocking Blackwater river formed a lake of secondary disaster chain for further analysis and demonstration.