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中文摘要：
中隔墙是连拱隧道的主要承载构件,若中隔墙顶部回填不密实极易引发顶部围岩的大变形或塌方,针对这一现象,研制了相似模型材料和配套试验设备,开展了相应的破坏性模型试验,研究了塌方的演化过程,并通过离散元UDEC数值模拟,再现了模型试验中隔墙顶部围岩塌方破坏的全过程,从围岩位移和塑性区分布情况分析了塌方机制,计算结果与模型试验吻合较好,并提出了有针对性的预防措施,对类似工程具有借鉴意义。
英文摘要：
Middle wall is the main bearing component of the double arch tunnel.Non-dense backfill on the top of the middle wall can easily lead to large deformation or collapse of surrounding rocks.In response to this phenomenon,we developed a similar model material and the test equipment and carried out the corresponding destructive model test,by which the evolution process of the collapse was studied.The whole process of collapse has been reproduced by UDEC simulation;and the numerical results are in good agreement with the model test.Collapse mechanism has been derived from the distribution of displacement and plastic zones.Finally,we propose targeted prevention measures which are of reference value for similar projects.
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