摘要
对六盘山隧道洞口k14＋165～k15＋710段大变形情况进行研究，分析了弱胶结软岩大变形特征；对该段弱胶结软岩隧道施工进行施工过程力学行为分析与三维数值仿真，得出了开挖过程中隧道断面位移变化情况，开挖50d后，拱顶沉降趋于稳定，沉降稳定值为355．09mm；提出了“两榀型钢＋一榀格栅”联合支护技术，在最终支护强度和最终约束围岩位移方面均满足六盘山隧道支护适应性要求。
study on the six panshan tunnel k14 ＋ 165 - k15 ＋ 710 section of large deformation, large deformation of weak cementation soft rock analysis; analysis of mechanical behaviors of the construction process and the three-dimensional numerical simulation of the weakly cemented soft rock tunnel construction, the changes of displacement in the excavation process of tunnel excavation, 50 days later, vault settlement tends to be stable. The settlement value is 355.09 mm, stable; put forward the ＂two pin type steel ＋ a grille＂ combined support technology, in the final support strength and the ultimate constraint of surrounding rock displacement meets the six panshan tunnel support adaptability.
出处
《公路工程》
北大核心
2016年第6期135-140,共6页
Highway Engineering
基金
高海拔寒冷地区软岩长大隧道安全环保施工关键技术(14-C10)
关键词
弱胶结软岩
隧道施工
“两榀型钢+一榀格栅”联合支护技术
weakly cemented soft rock
tunnel construction
＂two pieces of steel ＋ a grid＂ combined support technology
