Study On The Characteristics Of Sliding Zone And Dynamic Response Mechanism Of Daguangbao Giant Landslide

Daguangbao massive landslide as the largest landslide in the Wenchuan earthquake, the boundary conditions, formation mechanism, motion characteristics,tectonic setting, landslide dynamic response etc.are always the most issue of concern by researchers. The paper focuses on the landslide development laws and the evolutionary characteristics and optical landslide sliding zone features and landslide dynamics response mechanism: starting from the formation of the boundary faults of the landslide, on landslide area tectonic evolution process is proposed for the general understanding; The paper puts forward the overall understanding of landslide area tectonic evolution process,through the study of seismic geomorphology, summarized the development of the law of the study area and the earthquake landslide on the right bank tributary of the Huangdongzi valley landform evolution "contribution" from the isochroneity and diachroneity. A comparative analysis of the fault in the layer and the cause of the mechanism of the formation of the mechanism, let us have a further understanding of the sliding zone; The research on damage process and metamorphism of sliding zone and smooth rock of large high speed and long distance landslide in earthquake landslide deformation provides a reference: along the landslide back wall development of Sihetianjing fracture for Wenchuan earthquake seismogenic fault in the North West of the buried faults and the faults in Daguangbao giant landslide formed early boundary of landslide formation provides favorable conditions, the landslide area fracture concealed fracture end and the accumulation of huge stress may provide power at the same time layer and in the wrong move together on the scale of landslide control for the initial movement of landslide. Based on the research of Wenchuan earthquake collapse in study area a detailed investigation of the sliding body found: the number and scale of collapse and slide triggered by the Wenchuan earthquake in the right bank of Huangdongzi valley are much larger than the left bank; through the comparison of typical profile into a step found in the study area seismic geomorphology of recurrence in situ evidence; combined with examples,The article concluded that Huangdongzi ditch on the right bank of evolution related with ancient landslide events many times; The study indicates that landslide of ancient earthquakes many times recurrence in situ source physiognomy evolution of landslide has a important significance. At the same time has a pivotal role to elucidate the Longmenshan area and other earthquake prone area landform evolution and development.Daguangbao massive landslide slip zone characteristics: layer dislocation is a typical section from top to bottom: cataclastic rocks, silty layer, fault dynamic differentiation layer and a clay layer, and for on characteristics of each layer of rock composition, structure, development site in detail is description layer; The thesis divided the Daguangbao landslide slip zone formation model into five processes interspersed; From the macroscopic view, and the dislocation surface at the lower part of the rock from the wrong aerodynamic surfaces closer to its fault degree higher and higher, the rock is broken; from the microscopic point of view, from the dislocation surface is nearly wrong move, the higher the degree of rock the primary sedimentary structure retention worse, instead is the development of fragmentation. In this paper, the newly formed rock or mineral in the dynamic response process of the landslide is named as the Landslide epidiagenesis, and combined with many examples to explain the formation of the landslide. Daguangbao massive landslide as a typical high speed and long distance features of deep landslide, with the formation of the landslide formation rocks of the internal and external conditions: slide with great thickness of body and sliding body in the early campaign did not happen a large-scale disintegration, making the sliding body in motion near the sliding face a huge pressure;sliding zone rock dolostone of the Sinian Dengying Formation, and in the 200 to 300 degrees Celsius temperature and pressure conditions can let the deterioration. The daguangbao landslide rock formation and previous research are compared and formed Landslide epidiagenesis system. Using the vertical comparison, horizontal comparison,longitudinal comparison to study Daguangbao landslide metamorphic rocks were found that: surface deterioration of parts of the lower part of the rock mass will be metamorphosed in varying degrees, and degree of metamorphism with from sliding distance increase and decrease until a certain depth of the metamorphic phenomenon disappeared completely; Horizontal comparison shows that surface at high elevation rock metamorphic degree lowest elevation rock metamorphic degree is the highest,low elevation, the metamorphic rock of medium, indicating that the elevation region in the process of landslide by temperature and pressure conditions are not the same changes according to the theory of values. Daguangbao landslide metamorphic rocksalong the sliding direction(longitudinal) development feature: from the edge of the landslide to the front of the landslide, the metamorphic degree of sliding rock are higher and higher.