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分析模型已广泛应用于地下洞室设计的验证、矿山规划和复杂建筑物通风系统的研究。一般说来,数值模型还缺乏有效的手段,特别在模拟地质情况复杂深层结构体系周围的应力状态是如此。本文讨论了模拟岩石的材料在岩体的物理模拟和地下结构模型试验中的应用。这里介绍的试验方法,是模型验证一种有效的手段。研究的具体结构是光壁圆形隧洞的交叉段。本文给出了为结构模型试验作准备的、用模拟岩石的材料浇制的、大尺寸立方体试件的室内试验成果,确定了模拟母岩的材料在弹性状态和塑性状态的重要特性参数,对这种浇注模型的荷载相似和边界条件也作了详细说明,最后,介绍了根据试验结果得出的原型结构对荷载响应的估计以及隧洞承受单轴应变荷载时的破坏机理。
The analytical model has been widely used in the verification of underground cavern design, mine planning and the study of complex building ventilation systems. In general, the numerical model still lacks effective means, especially in the stress state around a complex deep structural system that mimics geological conditions. This paper discusses the use of materials that mimic rock in physical simulations of rock masses and model tests of underground structures. The test methods presented here are an effective means of model validation. The specific structure of the study is the cross section of a light wall circular tunnel. In this paper, the experimental results of a large-scale cube test specimen prepared by simulating rock material in preparation for the structural model test are given, and the important characteristic parameters of the material of the simulated parent rock in the elastic state and the plastic state are determined. The load similarity and boundary conditions of this casting model are also described in detail. Finally, the estimation of the load response of the prototype structure based on the experimental results and the failure mechanism of the tunnel subjected to uniaxial strain loading are introduced.