极高地应力软岩隧道超前导洞应力释放及多层支护变形控制技术
发布时间：2019-05-19 11:39
【摘要】：为了解决极高地应力软岩隧道大变形控制难题,以兰渝铁路木寨岭隧道岭脊核心段施工为例,通过现场试验和数据分析,得到如下主要结论:1)提出了"先放后抗,抗放结合,锚固加强"的变形控制理念;2)得出了该隧道岭脊核心段"超前导洞应力释放+圆形4层支护结构+径向注浆+长锚杆+长锚索"综合变形控制方案;3)超前导洞应力释放效果明显,正洞累计变形减小幅度约为34%;4)得到了圆形多层支护结构变形规律;5)累计变形均控制在设计预留变形量内,保证了该隧道岭脊核心段大变形控制效果。
[Abstract]:In order to solve the problem of large deformation control of extremely high ground stress soft rock tunnel, taking the construction of the core section of Muzhailing tunnel of Lanyu railway as an example, through field test and data analysis, the main conclusions are as follows: 1) put forward "release first and then resist." The deformation control concept of anti-release combination and anchoring strengthening; 2) the comprehensive deformation control scheme of "leading guide tunnel stress release circular four-story supporting structure with long bolt and long anchor cable" is obtained. 3) the stress release effect of the leading guide tunnel is obvious, and the cumulative deformation of the positive tunnel is reduced by about 34% 鈮，
本文编号：2480698
[Abstract]:In order to solve the problem of large deformation control of extremely high ground stress soft rock tunnel, taking the construction of the core section of Muzhailing tunnel of Lanyu railway as an example, through field test and data analysis, the main conclusions are as follows: 1) put forward "release first and then resist." The deformation control concept of anti-release combination and anchoring strengthening; 2) the comprehensive deformation control scheme of "leading guide tunnel stress release circular four-story supporting structure with long bolt and long anchor cable" is obtained. 3) the stress release effect of the leading guide tunnel is obvious, and the cumulative deformation of the positive tunnel is reduced by about 34% 鈮，
本文编号：2480698
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2480698.html
