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

摘要

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q1、q2及地层水平应变时对隧道产生的附加荷载qH,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 horizontal strain (qH) above the mined-out area are calculated and the allowable values of these two kinds of stratum deformation 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 paper 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.