The Landslide Controlling Factors And Dynamics Evolution Mechanism

Abstract:With rapid economic development, engineering construction activities become more frequent, and the landslide has become one of the most serious natural disasters, a serious threat to people’s life and property safety. To obtain the required data through the collection, statistics and analysis method, the relationship between the main controlling factors of landslide and landslide dynamics evolution mechanism was studied by using the method of mechanical analysis and theoretical derivation.First, the mechanism of landslide control elements was discussed, and the important controlling role of the slope slide material, geological structure, topography and other factors on the formation and evolution of landslide was found. With the typical landslide data in the southwest region of China, the geological and topographical factors on the influence of landslide parameters and its distribution was analyzed.Then, the landslide dynamics evolution law on stress field was studied, and the relationship between tectonic stress field and earthquake law was explored. It was found that the new tectonic stress field has a significant impact on macroeconomic development of landslide. According to the principle of conservation of energy, the dynamical evolution equation of the landslide slip surface morphology change was acquired. The evolution of the friction coefficient of landslide sliding surface was discussed, and based on the Dieterich-Ruina friction theorem, the weakening mechanism of friction on the material of rock and soil was studied, found that with increasing sliding distance the friction coefficient decreases with a negative exponent, and presents the evolution by the peak friction coefficient decay to a steady value. Then based on friction theorem, the landslide dynamics model was established, and the mechanical expression of landslide dynamics evolution process and under the force of earthquake the landslide sliding conditions were obtained.Finally, under the action of landslide induced factors,the internal mechanism of landslide was explored. According to the statistical data, the relationship between seismic landslide distribution and magnitude of earthquake, earthquake intensity, epicentral distance parameters was obtained. And for Wenchuan huge landslide, under earthquake the effect of the control factors on seismic landslide was analyzed.The influencing factors of landslide forecast and method were discussed preliminarily, and found that in the accurate judgment of the stage of slope evolution, the combination and comprehensive judgement of the spatial and temporal evolution rules of landslide are the correct way for landslide prediction.