Experimental Research On The Acceleration Effect Of Instant Vibration On Rock Mass Fracture Of Rock Landslide

The sliding mechanism of Jiweishan landslide in Wulong,Chongqing,is a hot issue in the field of landslide research.The main purpose of this paper is to study the acceleration effect of rock mass vibration at the moment of failure.On the basis of collecting and testing rock physical parameters,rock mechanical properties are tested by mechanical experiments.At the same time,a three-dimensional nine-axis attitude sensor is used to collect the data of vibration acceleration produced by rock mass rupture in the process of experiment.Taking the Jiweishan landslide in Chongqing as the research object,taking the collected Jiweishan limestone rock in Chongqing as the main experimental object of rock mechanics,taking two kinds of sandstone(sandstone and hard sandstone)and C40 concrete samples as the reference of mechanical experiments,and assisted by three-dimensional nine-axis sensor,the vibration acceleration produced by rock rupture in rock direct shear test and uniaxial compression test was calculated and studied.The correlation and contrast diagrams between uniaxial compressive strength,shear force,shear strength,loading rate,loading mode,elastic modulus,area of failure shear surface,wave velocity and density of rock mass samples between different lithologies and the same lithology and instantaneous failure vibration acceleration of rock samples.The comparative data of vibration acceleration of various rock mechanics tests are analyzed.Through the analysis and processing of the test data,the energy conversion efficiency of the test sample is obtained.The total energy generated by shear force is 0.4321-0.8084 times of the kinetic energy of the landslide.The initial acceleration of the landslide body is obtained,and the velocity of the landslide body in three stages and the time of the whole movement process are estimated.This numerical value provides a basis for the study of the mechanism of the start-up of 3DEC numerical simulation.Three-dimensional discrete element software is used to simulate Jiweishan landslide,and the vibration acceleration of instantaneous breakdown of rock mass is the main factor for the start of Jiweishan landslide in Wulong.So we can further understand the principle and mechanism of the rapid start of the landslide,and provide reference and suggestions for the stability evaluation and prevention of the same or similar rock landslides in the future.