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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。
The middle partition is the main bearing component of the multi-arch tunnel. If the backfilling at the top of the middle partition is not very dense, it can easily lead to large deformation or landslide at the top of the surrounding rock. In response to this phenomenon, similar model materials and supporting test equipment have been developed. Correspondingly, The destructive model test was used to study the evolution of landslides. The UDEC numerical simulation of discrete elements was used to reproduce the whole process of collapse and collapse of the surrounding rock at the top of the partition wall in the model test. The landslide mechanism was analyzed from the displacement and plastic zone distribution of surrounding rock. , The calculated results are in good agreement with the model tests, and put forward targeted preventive measures, which have reference significance for similar projects.