摘要
危岩崩塌已成为我国山区三大地质灾害之一,具有突发性强、预测难度大及冲击破坏性大等特点。文中通过对四平隧道上方危岩分布情况和形态特征现场调查,结合精测地形和RocPro3D三维数值模拟,分析3个危岩带崩塌块石的堆积位置、落石运动轨迹及影响范围,得出合理的拦挡措施设置位置。结果表明,研究区特高位危岩体主要以悬臂拉裂倾倒式、错断坠落式及压裂倾倒式3种失稳模式发生崩塌破坏;在雨水侵蚀和风化作用下,危岩带底部岩体压裂或岩腔内侧扩展,卸荷裂隙竖向延伸扩展,逐渐形成独立塔柱状危岩和壁挂式危岩;危岩拦挡设置可根据落石轨迹与弹跳高度、运动速度、冲击能量关系进行设置。
As one of the three major geological disasters in mountainous areas of China,the collapse of dangerous rock has the characteristics of strong sudden occurrence,difficult prediction and great impact damage.Based on the field investigation of the distribution and morphological characteristics of dangerous rock above Siping tunnel,combined with the precise terrain measurement and RocPro3D numerical simulation,the accumulation position,movement trajectory and influence range of the collapsed rock in three dangerous rock zones were analyzed,and the reasonable location of the blocking measures was obtained.The research results show that the extremely high dangerous rock mass in the study area mainly collapses and fails in three kinds of instability modes:cantilever tensile fracture tipping type,dislocation fall type and fracturing dumping type.Under the action of rain erosion and weathering,the rock mass at the bottom of the dangerous rock zone is fractured or the rock cavity expands inside,the unloading fissure extends vertically,and gradually forms the independent tower pillar dangerous rock and wall mounted dangerous rock.The barrier setting of dangerous rock can be set according to the relationship between rockfall trajectory,bounce height,movement speed and impact energy.
作者
张玉广
杨远翔
彭小勇
张国发
吁燃
ZHANG Yuguang;YANG Yuanxiang;PENG Xiaoyong;ZHANG Guofa;XU Ran(Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 550081,China)
出处
《交通科技》
2023年第6期91-96,共6页
Transportation Science & Technology
关键词
特高位危岩体
RocPro3D
灾变特征
运动规律
extremely high risk rock mass
RocPro3D
catastrophic characteristics
movement patterns
