落石体积与启动位置对运动轨迹的影响  

Effect of Rock Block Volume and Initial Position on Movement Trajectory of Rockfall

作　　者：许龙 孙翰卿 李文俊 周明文 XU Long;SUN Hanqing;LI Wenjun;ZHOU Mingwen(Nonferrous Mine Geological Disaster Prevention Center of Guangdong Province Guangzhou 510080,China;Guangzhou Municipal Construction Co.,Ltd.Guangzhou 510030,China;School of Civil Engineering and Transportation,South China University of Technology Guangzhou 510640,China;Guangzhou Design Institute Group Co.,Ltd.Guangzhou 510620,China;Guangzhou Construction Group Co.,Ltd.Guangzhou 510030,China)

机构地区：[1]广东省有色矿山地质灾害防治中心,广州510080 [2]广州建筑股份有限公司,广州510030 [3]华南理工大学土木与交通学院,广州510640 [4]广州市设计院集团有限公司,广州510620 [5]广州市建筑集团有限公司,广州510030

出　　处：《广东土木与建筑》2024年第6期29-33,共5页Guangdong Architecture Civil Engineering

基　　金：住房和城乡建设部科学技术计划项目(2022-K-039);广东省住房和城乡建设厅科技计划项目(2020-K5-144658);广州市建筑集团有限公司科技计划项目([2023]-KJ016)。

摘　　要：落石运动轨迹分析是灾害防治的核心工作之一。为研究落石的体积、启动位置对运动轨迹的影响,依托某大型花岗岩边坡落石综合治理工程,采用ANSYS/LS-DYNA模拟不同区域内边长为0.5 m、1.0 m和2.0 m三种尺寸落石的运动轨迹。研究结果表明:高程170 m处边长为0.5 m与1.0 m的块石滚落与坡脚挡土墙碰撞后停止运动,而边长2.0 m块石则飞跃挡土墙撞击坡脚建筑;高程200 m处边长为0.5 m与1.0 m的块石启动运动一段距离后停留在坡表,而边长2.0 m块石飞跃挡土墙,影响建筑物安全;高程230 m处边长为0.5 m、1.0 m和2.0 m的块石启动运动一段距离后均停止在排水沟附近。可见块石体积与启动位置显著影响落石的运动轨迹,大体积块石的运动能力相对较强,更易飞跃防护措施从而影响建筑物安全。Rockfall trajectory analysis is one of the key tasks for disaster prevention.To study the influence of rock block volume and initial position on the movement trajectory,a three-dimensional slope model was established based on the rockfall protection project of the granite slope.The ANSYS/LS-DYNA was used to simulate the movement trajectories of rock blocks with side lengths of 0.5 m,1.0 m and 2.0 m in different areas.The results show that the rock blocks with side lengths of 0.5 m and 1.0 m located outside the drainage ditch at an elevation of 170 m collided with the retaining wall and stopped at the slope toe,while the rock block with a side length of 2.0 m leapt over the retaining wall and impacted with the architecture.The rock blocks with side lengths of 0.5 m and 1.0 m located near the drainage ditch at an elevation of 200 m moved for a short distance and then stayed on the slope surface,while the rock block with a side length of 2.0 m leapt over the retaining wall and affected the safety of the building.The rock blocks with side lengths of 0.5 m,1.0 m and 2.0 m located inside the drainage ditch at an elevation of 230 m stopped near the drainage ditch after moving for a short distance.It can be seen that the trajectory of the rockfall is closely related to the volume and position of the rock blocks.The motion ability of rock block with large volume is relatively strong,and it is easier to leap protective measures to affect the safety of buildings.

关 键 词：崩塌落石 运动轨迹 块石体积 启动位置 数值分析 

分 类 号：TU452[建筑科学—岩土工程]