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借鉴透明土技术,采用自行研制的透明岩体实验装置进行岩体物理模型试验研究,分析了无构造应力作用下深埋圆型巷道围岩内部变形破裂的演化规律.结果表明:随着巷道埋深的增大,圆型巷道顶底部围岩沿着巷道两侧拱腰斜向上32°~34°的2条弧线向巷道内发生滑动,从而导致巷道失稳破坏;当荷载达到一定值时,巷道围岩将发生软化现象,岩体变形速率开始急剧增大,巷道表面将在左上、右上、左下和右下4个角部区域产生最大收敛;巷道围岩的破裂发展在加载过程中大致可分为未破裂、裂纹开始出现、上下裂纹开始交汇、裂纹开始交错贯通、裂纹大幅交错贯通、裂纹偏转压密6个阶段.
Based on the transparent soil technology, the physical model test of rock mass was conducted by using the self-developed transparent rock mass experimental device, and the evolution of deformation and rupture in the surrounding rock of the deep buried tunnel was analyzed under no tectonic stress.The results show that with the tunnel buried When the load reaches a certain value, the surrounding rock at the top and bottom of round roadway slides into the roadway along the two arcs of 32 ° -34 ° obliquely on both sides of the roadway, resulting in the instability of the roadway. When the load reaches a certain value , The surrounding rocks of the roadway will soften, and the deformation rate of the rock mass begins to increase sharply. The surface of the roadway will have the maximum convergence in the upper left corner, the upper right corner, the lower left corner and the lower right corner of the four corner areas. Can be divided into unbroken, cracks began to appear, the upper and lower cracks began to meet, the cracks began to staggered through, the cracks staggered through, cracks deflection compacting six stages.