Analysis on Stability of Dangerous Rock Masses on High-Steep Slope at the Entrance of a High-Speed Railway Tunnel
The differentially weathered granite dangerous rock mass on the high and steep slope at the entrance of a high-speed railway tunnel poses a serious threat to the safety of railway construction and later operations.But Due to the development of vegetation such as trees and shrubs on slopes,it is difficult to assess the risk of danger-ous rock masses.This article combines engineering geological conditions and manual surveys.Based on the results of unmanned aerial vehicle(UAV)radar and photographic surveys,the distribution,existence(buried,exposed)status and status of such dangerous rock masses were analyzed in detail.Destruction(eccentric slide out)mode.It is proposed to conduct Laboratory and field tests on GF-8 and GF-12 characteristic dangerous rock masses,and use limit equilibrium to perform stability calculations to demonstrate the stable state of dangerous rock masses under different working conditions.A three-dimensional simulation(process includes:bounce,collision,rolling and sliding)analysis method based on UAV radar digital elevation model(DEM for short)is proposed,which Provides the movement speed and bounce of unstable dangerous rock mass height,trajectory and impact energy.The results indicate that this type of differential weathered mass located on steep slopes ranging from 32°-45° degrees is currently in an unstable state and prone to instability under conditions such as heavy rain and earth-quakes.Even minor changes in geological conditions can trigger instability and collapse.In the vegetation-cov-ered section,the movement speed of the unstable rock mass is low,with high energy consumption,and the maxi-mum bounce occurs at higher positions,resulting in a divergent trajectory.In the sparse vegetation section,the maximum collision bounce occurs at the foot of the slope with a large take-off height,weak energy dissipation,and a more concentrated trajectory of movement.Based on the calculation and simulation data,measures for in-situ stabilization,removal of dangerous rock mass and protective net protection are given.The research results also provide certain reference value for the assessment of dangerous rock masses under similar geological conditions.
dangerous rock mass analysisstability calculationmotion simulationrisk management and control
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NSTL
万方数据
维普
