Research On The Characteristic Parameters And Protective Measures Of Rolling Stone Motion Based On Discrete Element Method

Rolling stone disaster is a common natural disaster with strong randomness,wide impact,and short timeliness in mountainous areas.It poses significant safety hazards to mechanical equipment,personnel safety,and normal operation and management of water conservancy projects in mountainous areas.Therefore,in-depth research on rolling stone disaster is of great significance for the construction and operation management of water conservancy projects in China.This article combines the discrete element simulation method,passive protection net indoor pressure test,intelligent algorithm,etc.to study the characteristic parameters of rolling stone movement,calibration of rolling stone discrete element model parameters,and dynamic response process of rolling stone impact protection measures.The research results are applied to solve practical problems in waste slope engineering.The main research content and achievements of this article are as follows:(1)Based on the sensitivity of grey correlation analysis to the characteristic parameters of rolling stone motion,a prediction model for rolling stone motion characteristic parameters was established using Gaussian regression,support vector machine,and neural network methods,achieving accurate and fast estimation of rolling stone motion characteristic parameters;Subsequently,a foreign rock rolling hazard risk rating system was used in conjunction with relevant literature to evaluate the risk of rock rolling hazards on actual waste slopes.Based on the analysis results,it was determined that corresponding protective measures need to be added to the waste slope to reduce losses caused by rock rolling hazards.(2)A passive protection net indoor pressure test platform was built to record the displacement changes of the passive protection net measurement points.Subsequently,a discrete element model of the test platform was constructed to record the numerical simulation data of the displacement changes of the measurement points.The intelligent calibration model of the passive protection net discrete element parameters was constructed by combining indoor test data,discrete element numerical simulation data,and artificial intelligence algorithms,This model overcomes the randomness and uncertainty of traditional trial and error methods;Subsequently,a 3D model of irregular rolling stones was established based on the 3D reconstruction method,laying the foundation for simulating the 3D discrete element rolling stone motion feature parameters of irregular rolling stones.(3)Based on the three-dimensional discrete element method,the motion characteristics of irregular rolling stones in three-dimensional slope terrain were simulated.Determine the design concept of passive protective nets.Due to the difficult deployment conditions at the top of the slope,passive protective nets are generally placed as close to the bottom of the slope as possible;After determining the placement position and parameters of the passive protective net based on the simulation results of the characteristic parameters of the rolling stone movement,the dynamic response law of the rolling stone impact passive protective net is studied by monitoring the velocity changes of the rolling stone and the displacement changes of the measuring points of the passive protective net when irregular rolling stones impact the passive protective net.