三台阶七步法不同台阶高度开挖数值模拟对比分析  

Comparative Analysis of Numerical Simulations of Three-bench Seven-step Excavation Method in Different Bench Height

作　　者：刘秀[1,2] 李德武[1] 于文山 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [3]中铁十三局集团第一工程有限责任公司,辽宁大连116021

出　　处：《兰州交通大学学报》2012年第3期52-56,共5页Journal of Lanzhou Jiaotong University

摘　　要：以兰渝铁路天池坪隧道进口段施工为例,对三台阶七步开挖法采用不同台阶高度的两种工况进行了数值模拟,结合现场测试结果和应用有限元软件模拟的结果,通过对比分析发现三台阶七步开挖法增加上台阶开挖高度虽然在一定程度上增大了上台阶的净空,这样有利于施工的操作,但是会增加围岩的变形和增大支护结构的受力.综合分析结果认为上台阶的开挖高度不宜太大.Numerical simulation is made for two conditions of three-bench seven-step excavation method adopting different bench height, with the construction of the entrance section of Tianchiping Tunnel on Lanzhou-Chongqing Railway as an example. Combining the results of field measurement and finite element software simulation results, the comparative analysis indicates that increasing the bench height to some extent is helpful to construction operations, but it also increases the deformation of surrounding rock and the force of supporting structure. The final conclusion drawn is that the height of bench excavation should not be too high.

关 键 词：软岩隧道 三台阶七步开挖法 现场测试 数值模拟 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]