Study On Numerical Simulation Of Rockfalls Motion Characteristics And Flexible Protection On High And Steep Slope

With urbanization construction and exploitation of mountain resources,engineering activities in mountainous areas are increasing,and geological safety hazards are accumulating with them.Landslide is the most frequently occurring mountain geological disaster,which poses a great threat to the safety of local people’s lives and properties.Landslides are the most prone to natural disasters in the mountains and are a huge threat to the inhabitants of the location.In this paper,based on the geological disaster prevention and control project of Huatai Trail in Jiuhua Mountain Scenic Area,site investigation and engineering data collection were taken,relevant calculation formulae were compiled,and numerical simulation software was used to analyze the stability of dangerous rock bodies and simulate the movement characteristics of falling rocks,and targeted dangerous rockfall prevention and control measures were proposed.The article uses a case study of the Jiuhua Mountain area in China in the disaster prevention process to organize relevant calculation formulas through site exploration and literature search.Then numerical simulation software is used to carry out stability analysis of dangerous rock masses and simulation calculation of rockfall motion characteristics.Finally,targeted rockfall prevention and control measures are proposed based on the results.The main research work and results are as follows.(1)Based on the field survey and combined with engineering geological data,The article is based on field observations and relevant information of work,the critical rock zone in the study area was divided,and the data of typical critical rock body scale size and fracture production were obtained;the factors influencing the development of critical rock body and destabilization mode were analyzed.(2)Based on the limiting equilibrium theory,the stability of typical critical rock bodies in the study area was quantitatively evaluated under natural,storm and earthquake conditions,and the stability state of each critical rock body was obtained.(3)Using UDEC discrete element software to model and numerically simulate the slope surface where the dangerous rock body W1 is located,the stress-strain and displacement changes of the dangerous rock body under natural,rainstorm and earthquake conditions are studied.(4)The formulas for calculating different modes of falling rock motion were compiled and summarized,and the formulas were proposed to calculate the shape correction coefficients.The kinematic equations were used to calculate the rockfall motion for each slope hazard.(5)Using Rockfall numerical simulation software,the rockfall motion of each slope was simulated,and the results were compared with the calculation of the formula method.The effects of different influencing factors(rockfall height,mass,initiation method,slope material,slope and interception position)on the characteristics of rockfall motion were explored,and the rockfall motion law was summarized.Data and ideas are provided for the design of rockfall prevention and control of dangerous rocks.(6)According to the research results on the stability of dangerous rock body and rockfall movement,combined with the principle of scenic spot management,the dangerous rockfall control plan was compared and finally adopted the plan of "W1dangerous rock slope with SNS active protection network reinforcement,W3 and W4 dangerous rock slope with dangerous rock cleaning and flexible passive protection network interception".