| During mountain tunnel is building,extra-long tunnel will pass through complicated geologicalenvironment,and encounter different rock mass.During the tunnel is constructing and the construction iscompleted, because the factors affecting the tunnel structure stress is very complex, force of the differenttunnel structure is different, the influence factors of the structure’s stress and the weight is also different,therefore, People pay close attention to these questiones: how about the tunnel structure stress, reliabilityand whether tunnel structure is in safe state.In this paper, based on metagreywacke section of Anyuan tunnel,firstly,according to the results offield investigation in combination with geological survey data, analyses the engineering geologicalcharacteristics in metagreywacke section of the tunnel. On the basis of collecting and statistic analysisreliability factors of tunnel structure, namely random variable characteristic,determine the tunnel structurereliability calculation method and probability sampling techniques, set the limit state equation,build randomfinite element model.Use finite element software and imitate actual tunnel digging and lining process.Calculate structure reliability and sensitivity in metagreywacke section of the tunnel.According tocomputational analysis,this paper obtains histogram,probability density curve, probability distributioncurve of random variables and histogram,probability distribution curve,reliability,and failure probability oftunnel structural stress.Then based on the tunnel structural reliability,under certain significance level,calculate sensitivity and the corresponding rank correlation coefficient of the tunnel structural stress.Analyse the influence degree of tunnel random variables to structural stress.Finally, put forward themeasures to enhance the reliability of tunnel structure.This paper’s research result provide basis and reference for tunnel’s future design,construction andlater maintenance reinforcement. |
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