Study On Formation Mechanism And Prevent Methods Of Plate Girder Landslide

Sichuan Nanjiang Dahe secondary school by the town, Xinma secondary school and Santai secondary school in the landslide-spot inspection found that the three landslides have much in common. It is a special type of translational gliding landslide. The difference between the composition of the material is very special. Landslide was mainly from thick to a very thick layer of sandstone, usually at the bottom of mudstone, nearly vertical slope, a group of the structure that parallel to the slope surface will slope cut shell-like plate girder. it called for the plate girder landslide. It is precisely because this kind of smaller slope, rock close to the level of the main components of the slope was thick sandstone-like shell and a more complete, if the traditional limit equilibrium theory, the slope near the level of the bedrock deformed body, or virtually no possibility of sliding, so it is necessary for the formation of this type of landslide conditions, formation mechanism and its prevention and control measures, such as the theory and application of research.In this paper, the first of three examples of on-site landslide research and data analysis summarized, identifying three of the engineering geological conditions of landslides, landslide features, analyzed and summarized the plate beam conditions for the formation of landslides and to explore the mechanism of its causes. Because each type of model has its corresponding conditions and rock mass structure of the deformation and damage evolution of a particular process. According to the formation of landslide mechanism analysis concludes that this type of plug-type landslide three typical modes of deformation and failure.In the geological analysis based on the use of numerical simulation of two-dimensional discrete element method simulation of the landslide in the special, heavy rain conditions, the rapid infiltration of surface water after the edge of fissures, voids caused by water pressure slope drastic changes in the body, making a sharp increase in pore pressure, when fissures or cracks in water-filled gap to reach the critical height of a high head, the hydrostatic pressure in the fissures within and along the sliding surface of the uplift pressure under the combined effects of deformation and failure process, to further explore the mechanism of its causes. Through numerical simulation methods, and then show the slide plate beam process of deformation and failure, combined with the formula for calculating the start-up criterion for the plate girder type of landslide deformation and failure analysis to verify the conditions. In addition, of the same angle under the conditions of Waterloo, Waterloo and the landslide body deformation of the thickness of the correlation between failure modes.Plate girder landslide for the formation of special conditions and genetic mechanism proposed targeted prevention and treatment measures. Plate girder landslide treatment of major projects measures:⑴Slope water and widening cracks within the initiative contained drainage;⑵Supporting the foot of the short pile;⑶Slope in the upper anchorage or Poding beam fixed to prevent dumping. Combined with a typical plate girder type of landslide deformation and failure mode, respectively targeted treatment program works. Finally, secondary landslide rivers as an example, according to large deformation and failure of secondary landslide model of governance by the research program on governance and validation of further analysis.