采空区地层变形产生的隧道附加荷载及变形容许值计算与分析

Calculation and Analysis of the Additional Load Upon Tunnels Caused by Stratum Deformation and Allowable Deformation Values in Mined-Out Areas

文章分别计算了采空区上方地层弯曲时对隧道产生的附加荷载、及地层水平应变时对隧道产生q1q2的附加荷载,并推导出了采空区地层容许弯曲变形和水平应变数值。结果表明,现行交通部《采空区公路设计qH与施工技术细则》规定的采空区地基容许变形值较为笼统且偏大,结构偏于不安全。最后,文章根据计算结果对比,对不同围岩级别提出了更严格、更安全、更有针对性和可操作性的隧道对采空区地层变形限制要求,以供广大隧道工作者参考使用。

In this paper, the additional loads placed upon tunnels caused by stratum bending （q1 and q2） and horizon- tal strain （qH） above the mined-out area are calculated and the allowable values of these two kinds of stratum deforma- tion are deduced accordingly. The results show that the allowable values specified in the Guidelines for Design and Construction of Highway Engineering in the Mined-Out Area are relatively general and large, resulting in an unsafe structure. According to the comparative results and in light of the different classifications of surrounding rock, this pa- per puts forward some more rigorous, secure, targeted, and operable restriction requirements for stratum deformation in the mined-out area that can be used as a reference for tunnel construction workers.