气密性混凝土在松卜岭高瓦斯隧道衬砌中的应用

Application of airtight concrete in lining project of Songbuling high-gas-content tunnel

松卜岭隧道穿越煤岩层,为高瓦斯隧道。为保证隧道的运行安全,在隧道瓦斯设防段须采用气密性混凝土对坑道进行全断面封闭式复合衬砌。通过对隧道穿越的地质环境条件、设计标准、气密性混凝土材料以及合理配合比的选择分析,采用室内试件测定方法对混凝土试件的透气量进行测定,计算得出透气系数。对不同衬砌形式的混凝土的气密性进行了评价,结果表明:气密性混凝土在隧道衬砌中具有明显的抗气性。不仅能在瓦斯隧道衬砌中应用,也可应用于其他有较高防潮、防渗要求的工程中。

Going through coal-contained rock stratum,Songbuling tunnel is a high-gas-content tunnel.To ensure the safe operation of the tunnel,the gas-prevention section of the tunnel should be lined in full cross-sectional and closed composite manner with airtight concrete.By selecting and analyzing the geological environmental conditions,design criteria,airtight concrete materials and reasonable mix proportion of the tunnel,we determined air permeability of concrete specimens and calculated permeability coefficients with the determination method of interior test specimens.Therefore,the air tightness of concrete with the different lining forms is evaluated,and the results show that airtight concrete has obvious air resistance in tunnel lining,so it can be applied in gas tunnel and other projects with requirements of higher moisture-proof and seepage control.