乌鞘岭隧道志留系板岩夹千枚岩地段结构验证试验研究

Experimental identification of the structure safety in the section of Silurian slate with sandwiched phyllite in Wushaoling Tunnel

对乌鞘岭隧道志留系板岩夹千枚岩地段支护结构的受力特性,采用数值分析方法进行计算,开展现场结构试验并进行对比分析。试验揭示了隧道开挖后围岩应力释放引起的结构变形与支护压力变化规律,支护结构的稳定性和安全性在不同测试地段受各种影响因素的作用而不同。数值计算与现场试验结果表明,隧道衬砌的结构安全系数均满足规范要求,但应以按实测衬砌应力进行结构内力计算,并对结构安全性进行评价为宜。

Behavior of the support structure in the section of Silurian slate with sandwiched phyllite in Wushaoling Tunnel was analyzed by numerical method together with in -situ structural experiments, which revealed the rule of variation of structural deformations and stresses in support due to the stress relieving of surrounding rocks after excavation of the tunnel. The stabihty and safety of support structures are different in different sections as affected by different factors. Results of numerical analyses and in - situ experiments indicated, the factors of safety of tunnel structures satisfied the requirements of the specifications. Yet it is desirable to calculate the internal forces of structures by the measured lining stresses and thereupon to evaluate the safety of structures.