最大地应力方向对硐室受力和破坏影响的模型试验研究
Model Test Study on Influence of Maximum Geo-stress Direction on Force and Damage of Chamber
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摘要: 深部巷道围岩变形控制是深部岩土的重点课题之一，针对最大地应力方向对硐室受力和破坏形态的影响，采用深部巷道围岩破坏机理模拟试验系统进行模型试验研究。模型试验硐室采用直墙拱顶形硐室，利用应变片记录硐室围岩应变值，分别进行了最大荷载与硐室轴线成90°、60°、0°（平行）的3组试验。模型试验的研究表明：最大荷载与硐室轴线呈60°和90°时，仅硐室侧墙部位发生破裂，拱顶和底板下部产生的径向应变为受压状态，对硐室的破坏形态影响不明显；0°（平行）时，硐室拱顶、底板及侧墙部位均发生破裂，拱顶和底板下部产生的径向应变为受拉状态，对硐室的破坏形态影响较显著；深部巷道围岩破坏机理模拟试验能够较好的模拟深部巷道围岩破坏机制。Abstract: Deformation control of surrounding rock in deep roadway is one of the key topics in deep geotechnical soil. In this paper, the influence of the maximum geo-stress direction on the force and failure modes of the chamber is adopted. The model test of the surrounding rock failure mechanism simulation test system of the deep roadway is carried out. In the model test chamber, the straight wall arch chamber was used, and the strain values of the surrounding rock of the chamber were recorded by the strain gauges. The three groups of experiments were carried out with the maximum load and the axis of the chamber at 90°, 60° and 0° （parallel）. The study of this model test shows that at 60° and 90°, only the side wall of the chamber is ruptured, and the radial strain generated in the vault and the bottom of the floor is under pressure, which has no obvious effect on the failure mode of the chamber; at 0° （parallel）, the arch, the bottom plate and the side wall of the chamber are all broken. The radial strain generated in the vault and the bottom of the floor is the tension state, which has a significant effect on the failure mode of the chamber. Simulation test of surrounding rock failure mechanism of deep roadway can better simulate the surrounding rock failure mechanism of deep roadway.
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Keywords:
- maximum ground stress /
- chamber /
- radial tensile strain /
- deformation by force /
- simulation test
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