极浅埋连拱隧道施工过程围岩力学行为的模型试验研究

摘要

以长城岭连拱隧道为工程背景,针对极浅埋连拱隧道施工过程中围岩的力学变化特征,采用室内模型试验的方法对隧道开挖过程进行模拟,利用相关监测元件对应力、应变及围岩压力等信息进行采集和分析;借助有限差分软件对开挖过程进行数值模拟,结合数值计算结果验证了模型试验的结论,最终揭示了极浅埋连拱隧道伴随开挖围岩不同位置的应力变化规律,并得到了中隔墙上部及基底压力的变化趋势。%Based on the construction of Changchengling double-arch tunnel with heavily jointed soft rock mass,a model test was carried out to analyze the stress characteristics during the excavation.With the help of monitoring instruments,the datas of stress,strain and pressure were collected and analyzed.Then a numberical simulation was carried out with FLAC3D,and its results verify the conclusions of model test.Combining with numerical analysis,the results of the model test reveals the variation laws of the tunnel surrounding rock stress and the change trends of pressure above and below the middle wall.