柱状危岩体失稳运动三维DDA方法数值模拟分析  

Numerical Simulation Analysis of Instability Movement of Columnar Dangerous Rock Mass Using 3D DDA

作　　者：刘国阳 赵晟泽 钟智瑞 杨春雨 薄雾 刘俊杰 罗首益 于群 LIU Guoyang;ZHAO Shengze;ZHONG Zhirui;YANG Chunyu;BO Wu;LIU Junjie;LUO Shouyi;YU Qun(School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China;Dalian Taipingwan Collaborative Innovation Zone Planning and Construction Bureau,Dalian 116326,China;School of Engineering,Tibet University,Lhasa 850000,China)

机构地区：[1]沈阳工业大学建筑与土木工程学院,辽宁沈阳110870 [2]大连太平湾协同创新区规划建设局,辽宁大连116326 [3]西藏大学工学院,西藏拉萨850000

出　　处：《防灾减灾工程学报》2025年第1期179-187,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(42007241);辽宁省科技计划联合计划项目(2023-MSLH-259);辽宁省教育厅高校基本科研项目(LJ232410142029)资助。

摘　　要：柱状危岩体是边坡稳定性分析中一种重要的危岩体类型,其失稳破坏常引起高能量和破坏性的大规模岩崩灾害,具有普遍性、突发性和高频性等特点,是制约山区建设和发展的主要地质灾害之一。非连续变形分析(DDA)作为一种基于非连续介质力学的数值计算方法,具有完全的运动学理论及可靠的块体接触处理方案,非常适合模拟节理岩体系统的失稳破坏与运动过程。文章采用三维(3D)DDA方法对柱状危岩体的失稳破坏机理与破坏后的运动过程进行研究。研制了基于双目立体视觉原理的危岩体失稳破坏实验装置,开展了柱状块体系统室内实验研究,验证了3D DDA方法在分析柱状危岩体失稳运动方面的准确性。以望霞边坡柱状危岩体为例,建立边坡及危岩体3D DDA数值模型,分析柱状危岩体失稳运动全过程、动能及位移演化特征,讨论块体系统运动特性及崩塌滚石成灾机制。结果表明,柱状危岩体以滑动模式失稳,运动过程中直接与其沿途公路冲击碰撞,引发崩塌滚石地质灾害,具有高速高能等运动学特性。Columnar dangerous rock mass is an important type of dangerous rock mass in slope stability analysis.Its instability and failure often results in large-scale,high-energy rockfall disasters with destructive power.These events are characterized by their prevalence,sudden occurrence,and high frequency,making them one of the main geological hazards that restrict the construction and development of mountainous areas.Discontinuous deformation analysis(DDA),a numerical method based on the mechanics of discontinuous media,provides a comprehensive kinematic theory and reliable block contact handling schemes,making it highly suitable for simulating the instability,failure,and move-ment processes of jointed rock mass systems.This study used the three-dimensional(3D)DDA meth-od to investigate the instability failure mechanisms and post-failure movement of columnar dangerous rock mass.An experimental setup based on binocular stereovision principles was developed to study the instability and failure of dangerous rock mass.Laboratory experiments on columnar block systems were conducted,validating the accuracy of the 3D DDA method in analyzing the instability movement of columnar dangerous rock mass.Using the columnar dangerous rock mass of Wangxia slope as an ex-ample,a 3D DDA numerical model for the slope and dangerous rock mass was established.The entire instability movement process,kinetic energy,and displacement evolution characteristics of the colum-nar dangerous rock mass were analyzed.The movement characteristics of the block system and mecha-nisms of the collapse and rockfall-induced disasters were discussed.The results showed that the colum-nar dangerous rock mass became unstable through sliding,and it directly collided with the highway along its path during its movement,causing rockfall geological disasters.This movement exhibited ki-nematic characteristics such as high speed and high energy.

关 键 词：柱状危岩体 3D DDA 崩塌滚石 失稳运动 室内试验 

分 类 号：V212[航空宇航科学与技术—航空宇航推进理论与工程]