基于Rockfall数值模拟的危岩体运动规律分析

Motion law analysis of dangerous rock mass based on Rockfall numerical simulation

危岩体发育过程具有渐进性,失稳过程具有突变性和强致灾性,危岩崩塌灾害是山区公路工程建设及运营过程中普遍存在的突发性重大安全隐患,前期预测和分析危岩体落石运动特征可为危岩体治理提供参考。本文以兴义环高某特大桥桥台上方的危岩体为例,通过现场调查研究,分析危岩特征,采用Rockfall数值软件模拟危岩落石运动轨迹、落石终点水平位置,分析落石速度及其能量大小。结果表明:危岩体W5发生崩塌后,有大部分落石到达桥面,且在到达桥面时仍有较大动能和转动速度,会对桥面造成严重撞击和破坏,威胁和影响行车安全。建议对危岩体进行防护或加固,以保障公路建设运营安全。

The development process of dangerous rock mass is gradual,and the instability process is abrupt and highly disastrous.Dangerous rock collapse disaster is a common sudden major safety hazard in the construction and operation of highway projects in mountainous areas.The early prediction and analysis of the rockfall movement characteristics of dangerous rock mass can provide reference for the treatment of dangerous rock mass.Taking the dangerous rock above the abutment of a super large bridge in Xingyi highway as an example,through field investigation and research,this paper analyzes the characteristics of dangerous rock,uses rockfall numerical software to simulate the movement track of dangerous rock and the horizontal position of rockfall end point,and analyzes the rockfall speed and energy.The results show that after the collapse of dangerous rock W5,most of the falling stones reach the bridge deck,and there is still large kinetic energy and rotation speed when reaching the bridge deck,which will cause serious impact and damage to the bridge deck and threaten and affect the driving safety.It is suggested to protect or reinforce the dangerous rock mass to ensure the safety of highway construction and operation.