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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。
Applying the theory of similarity, the damage characteristics of the tunnel are studied by using the geomechanical model experiment. In the model experiment, self-developed model material, loading system and constrained maintenance structure are adopted. Through the simulation of stratum physical and mechanical indexes, geostress field and tunnel excavation process, the failure modes of soil tunnel are studied. By using micro-precision displacement measurement technology and stress measurement technology, the displacement and stress changes of tunnel during excavation and overloading are measured. Through data analysis, the excavation and loading failure of tunnel Rock stress distribution has been initially recognized, and explored the intrinsic mechanism of tunnel damage in model strata.