摘要
为进一步解决川藏铁路在复杂条件下的施工难题,以川藏铁路大渡河特大桥为工程依托,通过数值分析得到大桥锚洞与隧道的合理施工方案并对其安全性进行分析评价。结果表明:大渡河特大桥采取先施工锚洞再施工隧道的施工方案能够更好地保证安全性,在施工过程中需注意软弱破碎带的围岩加固、支护与监测;结合隧道锚变形、隧道锚与岩体间的剪应力和塑性区分布等计算结果,发现隧道锚极限抗拔主要由隧道锚与岩体间的剪应力控制,抗拔安全系数为6.0;隧道先施工时,拉萨侧锚洞施工对靠近洞口的隧道影响最大,需加强对相邻段近接隧道的位移监测。
In order to further solve the construction problems of Sichuan-Tibet Railway under complex conditions,this paper obtains the reasonable construction scheme of the bridge anchor hole and tunnel through numerical analysis based on the Dadu River Bridge of Sichuan-Tibet Railway as the project basis,and analyzes and evaluates its safety.The results show that the safety of Daduhe Bridge can be better guaranteed by the construction scheme of anchor hole construction first and tunnel construction second.In the construction process,attention should be paid to the reinforcement,support and monitoring of surrounding rock in the weak broken zone.Combined with the deformation of the tunnel anchor,the shear stress between the tunnel anchor and rock mass and the distribution of plastic zone,it is found that the ultimate uplift resistance of the tunnel anchor is mainly controlled by the shear stress between the tunnel anchor and rock mass,and the uplift safety factor is 6.When the tunnel is constructed first,the construction of the side anchor hole of Lhasa has the greatest influence on the tunnel near the entrance,so the displacement monitoring of the adjacent tunnels should be strengthened.
作者
马云飞
MA Yunfei(China Railway Design Corporation,Tianjin 300000,China)
出处
《铁道标准设计》
北大核心
2021年第10期60-65,共6页
Railway Standard Design
基金
中国铁路设计集团有限公司科技开发课题(2019YY220603)。
关键词
川藏铁路
悬索桥
锚洞
隧道
数值模拟
安全性研究
Sichuan-Tibet Railway
suspension bridge
anchor hole
tunnel
numerical simulation
safety study
作者简介
马云飞(1987-),男,工程师,2014年毕业于石家庄铁道大学隧道与地下工程专业,工学硕士,主要从事铁路隧道设计研究工作,E-mail:mayunfei@crdc.com。
