特长隧道TBM导洞扩挖法可行性分析

Feasibility Analysis of TBM Bored Pilot and Enlarging Tunnelling Method for Long and Large Railway Tunnel

本文依据某铁路长大隧道工程编制,研究在取消部分设计辅助坑道情况下,采用TBM先行导洞贯通后再实施钻爆扩挖的方案可行性。阐述分析工程概况、总体方案选择思路及依据,探讨技术方案适应性和具体方案特点;对进度指标选取进行客观论证,并对比具体方案在工期上的可行性;确定最优方案后,根据实践情况总结方案实施过程需注意事项并提出几点需思考的问题,以期对类似工程施工起到参考及借鉴意义。

Based on a long and large railway tunnel project, this paper studies the feasibility of adopting TBM to penetrate the pilot tunnel before drilling, blasting and excavation in the case of canceling part of the design auxiliary tunnel. This paper mainly introduces the general situation of the project, the train of thought and basis for the selection of the overall scheme, expounds the adaptability of the technical scheme and the characteristics of the concrete scheme, makes an objective analysis on the selection of the progress index, and compares the feasibility of the specific scheme in the construction period;after determining the optimal scheme, the matters needing attention and some considerations are summarized according to the practice situation, hoping to provide a reference for the construction of similar projects.