论文部分内容阅读
文章在分析黄土特点的基础上通过对各种开挖方法优缺点的比较、仿真分析及大量的实体工程经验总结,提出了适合黄土隧道的开挖方法:对含水量不高的一般黄土宜采用双侧壁导坑先拱后墙正台阶法施工;对于软弱的饱和黄土、核心部分为红色泥岩及浅埋段宜采用双侧壁导坑先墙后拱反台阶法。并对双侧壁导坑先拱后墙正台阶法提出了如下改进措施:拱脚处增设锁脚锚管,在上半断面拱架下部每侧增设2根2.5m长42锁脚锚管,减少拱脚下沉;缩短上台阶长度,以利下半断面及后期工序及时施作;预留沉降量由15cm加至20cm。
Based on the analysis of the characteristics of loess, this paper puts forward a suitable excavation method for loess tunnel through the comparison of advantages and disadvantages of various excavation methods, the simulation analysis and a large amount of experience of solid engineering. The loess is suitable for general loess with low water content For the weak saturated loess, the core part of the red mudstone and the shallow buried section should adopt the double-wall pit first wall and back arch anti-step method. The following measures are proposed to improve the back wall of the double-side pits: a) Anchoring anchor pipes are added at the arch feet, and 2 2.5m long 42-lock anchor pipes are added to the lower part of the upper half- Reduce the arch foot sinking; shorten the length of the step, in order to facilitate the next half-section and post-production processes in a timely manner; reserve settlement increased from 15cm to 20cm.