摘要
某高铁隧道进口高陡边坡体上的差异风化花岗岩危岩体,对铁路建设及后期的运营安全存在严重威胁.但由于坡体乔、灌木等植被发育,此类危岩体的危险性评估难度较大,本文在综合工程地质条件和人工调查以及无人机雷达、摄影勘察结果的基础上,详细分析了此类危岩体的分布、赋存(埋入、裸露)状态以及破坏(偏心滑落式)模式.提出对GF-8和GF-12特征危岩体,进行室内外试验,运用极限平衡理论进行稳定性计算,论证危岩体在不同工况下的稳定状态.提出了一种基于无人机雷达数字高程模型(简称:DEM)下的三维模拟(过程包括:弹跳、碰撞以及滚动和滑动)分析方法,计算失稳危岩体的运动速度、弹跳高度、运动轨迹以及冲击能量.结果表明:位于32°~45°直线陡坡体上的此类差异风化体在目前、暴雨、地震工况下处于欠稳定、不稳定状态,地质条件的微小变化都可能引起失稳坠落;在植被发育段,失稳危岩体的运动速度较低、能耗较大、最大弹跳发生在高位处,运动轨迹发散;在植被稀疏段,最大碰撞弹跳发生在坡脚处且起跳高度大,冲击能量大,运动轨迹较集中.根据计算、模拟数据基础,给出原位稳定、清除危岩体和设置防护网等防护措施.此次研究成果也为类似地质条件下的危岩体评估提供一定的参考价值.
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 dangerous 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 earthquakes.Even minor changes in geological conditions can trigger instability and collapse.In the vegetation-covered section,the movement speed of the unstable rock mass is low,with high energy consumption,and the maximum 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 protec
作者
韦海平
杨光树
郑晓军
杨文坚
刘晓丽
WEI Haiping;YANG Guangshu;ZHENG Xiaojun;YANG Wenjian;LIU Xiaoli(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;No.308 Geological Party,Yunnan Nonferrous Metals Geological Bureau,Kunming 650093,China;China Railway Beijing Bureau Group Company Handan Works Section,Handan 056002,Hebei,China)
出处
《昆明理工大学学报（自然科学版）》
北大核心
2024年第1期54-64,共11页
Journal of Kunming University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(42072094,42162012)。
关键词
危岩体分析
稳定性计算
运动模拟
风险管控
dangerous rock mass analysis
stability calculation
motion simulation
risk management and control
