摘要
川藏铁路折多山隧道进口沟槽两侧岩屑坡大量发育,岩屑坡失稳破坏形成崩塌滚石灾害,严重威胁铁路安全。通过现场调查、理论分析、数值模拟以及力学分析综合评价洞口岩屑坡的形成因素、运动特征及危害,提出了可行的治理方案。为预测和评估折多山隧道进口上部危岩崩塌体的运动过程及影响,基于三维真实地形,考虑不同位置的岩体崩塌运动,建立了危岩体三维离散元模型,得到了洞顶危岩崩塌体的运动特征以及最危险的岩屑坡整体失稳的运动特征。此外,基于数值模拟的结果,通过理论分析,计算了最不利情况下的崩塌落石路径及冲击能量,得到了隧道洞口的危岩体的影响范围。最后,根据隧道洞口危岩及岩屑坡的分布区域及运动特征,提出了"以防为主,防挡结合"的综合治理方案。
The talus slope,standing at the entrance of Zheduoshan tunnel,Sichuan—Tibet railway,has greatly threatened the security of railway,if it becomes to be the collapse and rock roll. Based on the data from the field observation and the results from the numerical and theoretical analysis,the talus slope is explored comprehensively,including formation mechanism,movement characteristics and its hazard effect. Hence,to figure out the movement characteristics and the affecting area of the rock falls,the 3D distinct element method is used to create a three-dimensional computing model of the dangerous rocks,which is based on the real environment of Zheduoshan and rockfall motion,in different sections. Finally the moving path of the dangerous rocks as well as the most dangerous talus slope were obtained,which stands at the top of the mountain. On the other hand,based on the results of the numerical analysis,focusing on the compact energy and the moving path,theoretical calculation of the dangerous rock falls has been made to assess the risk of the most dangerous talus slope. In a word,the affecting area of the dangerous talus slope can be got by using the numerical and theoretical analysis. Finally,based on the moving path and the affecting area of the talus slope,it is suggested that the talus slope manage relies mainly on prevention and combine block.
出处
《科学技术与工程》
北大核心
2017年第34期118-123,共6页
Science Technology and Engineering
基金
中国铁路总公司科研开发计划(2015G002-N)资助
关键词
川藏铁路
岩屑坡
形成机理
Sichuan-Tibet railway
talus slope
formation mechanism
