Research The Causes Of Slope Debris Flow Patterns And Movement Characteristics Earthquake Rock Region In Yingxiu

Study area is located in the central Longmen, high mountains and deep valleys, steep slope, and the complex geological structure, strong new tectonic movement. A large number of different distribution of granite, granodiorite high strength rocks, these rocks are fractured, crushed rock, in later exposed to strong vibration, caused collapses and landslides in different sizes, a lot of loose detritus deposited on the slopes parts, changing the characteristics of the micro-topography slopes, the impact after the earthquake, the slope of the catchment condition that causes the formation of a variety of causes of the study area mode and the motion characteristics of different debris flow on slope. A serious impact on the lives and property of people in disaster areas and traffic safety. Therefore, to carry out research on post-earthquake debris flow on slope of disaster prevention and reduction has important significance. Results and conclusions paper are as follows:(1) After the earthquake debris flow on slope activity increased, the critical lower rainfall, showed significant high-frequency resistance, mass and type diversity, with sudden strong, devastating, seasonal features.(2) Depending on the type and condition of provenance provenance of accumulation, debris flow on slope study area will be divided into the following seven categories:1)High landslide mass –jiede- side etching type: ①,high landslide accumulation body with medium and small landslide accumulation body-based, high stacking position. ②, the channel vertical gradient is relatively large, it was "steep- slow-Steep" stepped. ③, Debris speed, impact force, destructive, migration distance. ④, to Jiedi erosion + mode lateral erosion erosion accumulation body.2)Large landslide accumulation body- punching- traceability Erosion: ①, mostly in landslide accumulation body at the foot of the slope, mostly thick layer or thick layer stacked body. ②, the whole landslide accumulation body good stability, shallow bulk solids, less stable. ③, the kinetic energy of debris flows smaller, lower velocity. ④, to pull slot punching + mode traceability erosion debris flow.3) Erosion toe avalanche deposit: accumulate in large tapered toe avalanche deposit or planar avalanche deposit under storm action, superficial loose material flaky start. Debris flow velocity is slow, weak erosion, accumulation body mostly down stone tapered channel width and shallow4) High avalanche deposit Erosion: high avalanche deposit accumulation site to the main body of the small accumulation, poor stability. Provenance has a certain degree of secrecy, fluid movement speed, damage resistance, caused great harm.5) High avalanche deposit erosion trench type: mudslides have intermittent period, during non-storm, the margin of solids accumulation aloft after a gentle slope platform channel; during rainstorms, runoff erosion in the slope of loose solid material debris flow channel. Debris speed, damage power, small size, high outbreak frequency.6) Debris flow on slope landslide type: ①, mostly small shallow slippery. Potential energy ②, landslide landslide debris flow conversion process the main power source. ③, landslide debris flow is converted form a continuous fast process, with no interruption. ④, fluid motion during exercise greater resistance, the velocity is not.7) Type collapse debris flow on slope: can be divided into two categories: ①, rock collapse hit fragmentation flow accumulation. ②, rockfall accumulation during exercise erosion disturbance formed debris flow on slope, which is formed as follows: collapse collision erosion flow accumulation. ③, provenance, mostly shattered rock, no clear catchment areas, fluid containment great, small, slender channel, vertical gradient large, fast movement.(3) This paper discusses dilute coarse particles of debris flow on slope starting conditions for the establishment of the basic model of the cube is lean coarse debris flow on slope proposed slip cube model, flip(including around the edge flip, flip around the fulcrum and embedded solid around the edge flip), and other start-up mode.(4) Using the energy conservation theorem and momentum conservation theorem, collisions between coarse particles of different quality and characteristics of fluid motion in order to analyze the process of movement of coarse particles.(5) Combined with the basic principles of hydraulics and coarse particles start condition research to explore the relationship between the coarse particles of debris flow and rainfall intensity between the start condition and provide a theoretical basis for debris flow on slope monitoring.