某坑道破坏特征的地质力学模型实验研究

Study on the Failure of Tunnel by the Geomechanic Model Experiment

应用相似理论,采用地质力学模型实验对坑道破坏特征进行了研究。模型实验采用自行研制的模型材料、加载系统和约束维护结构,通过对地层物理力学指标、地应力场、洞室开挖过程等的模拟,研究了土体坑道的破坏形态。采用微型高精度位移量测技术和应力量测技术等,对坑道在开挖和超载破坏过程中的位移和应力变化情况进行了量测,通过数据分析对坑道开挖与加载破坏过程中的围岩应力分布有了初步认识,并对模型地层中坑道破坏的内在机理进行了探索。

The characteristics of tunnel failure are analyzed through a series of geomechanic model experiment based on the similarity theory. The rockmass, initial stress field, excavation are simulated by the geomeehanic model experiment with self-developed similar material, loading facility and restriction frame. The displacement and the stress variation during excavation and the failure of tunnel are exactly measured by micro high accuracy measuring technology for displacement and stress, the stress distribution of the rock during excavation and failure is obtained and the failure mechanism is revealed to some degree by analysis of the data.