对于建立隧道勘察瓦斯评价体系的探究

Research on establishing gas evaluation system for tunnel investigation

我国大量的公路、铁路隧道穿越或邻近煤系瓦斯地层,由于瓦斯可能产生的危害较大,前期勘察对隧道的安全施工及运营有着极其重要的先导作用。目前,在隧道瓦斯勘察工作中,存在前期选线瓦斯因素比选力度较小、瓦斯评价因素较为单一、瓦斯工区划分不够细致的不足之处。与各阶段勘察相匹配的瓦斯评价体系,对降低瓦斯风险、确保施工安全等具有重要意义。本文以公路隧道勘察为例,针对各阶段瓦斯勘察的侧重及目的,探讨了与工程可行性研究阶段、初勘阶段、详勘阶段相对应的隧道筛选评价体系、隧道方案比选评价体系以及瓦斯工区分区评价体系。阐述了各评价体系的影响因素,简要地介绍了评价步骤、过程,并结合一定的案例,论述了其实际意义。

In our country,a large number of highway and railway tunnels pass through or adjacent to coal-gas strata.Due to the harmfulness of gas,preliminary investigation plays an extremely important role in the safe construction and operation of the tunnel.At present,in the tunnel gas exploration work,there are some shortcomings,such as the earlier strength of line selection gas factor is weak,the gas evaluation factor is relatively single,and the division of gas work area is not detailed enough.Gas evaluation system matching with the various stages of exploration is of great significance.to reduce the risk of gas and ensure construction safety.Taking the highway tunnel investigation as an example,aiming at the emphases and purposes of gas exploration in various stages,this paper discusses the tunnel screening and evaluation mechanism corresponding to the feasibility study stage,the preliminary exploration stage and the detailed exploration stage,the comparison and evaluation mechanism of tunnel schemes and the evaluation mechanism of gas work area.This paper expounds the influencing factors of each evaluation mechanism,briefly introduces the evaluation steps and process,and discusses its practical significance in combination with certain cases.