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针对深部岩体物理模型试验中存在的内部变形量测难题,采用透明岩体相似模拟试验新方法,利用自行研制的数字散斑相关变形量测技术,通过进一步对模型内部制斑方法展开实验研究,得到了非构造应力作用下深埋圆形软岩巷道围岩的内部变形与破裂规律。研究结果表明:1)提出的透明岩体人工填充式制斑方法能够有效保障数字照相变形量测的实施与精度;2)不同埋深下,围岩的径向位移与其距巷道表面的距离大体呈指数衰减关系;3)围岩的宏观裂纹数目、总长、破裂区域宽度与其埋深呈指数增长关系,而破裂分形维数则与埋深呈线性增长关系;4)巷道两帮及对角线处的浅部岩体为重点锚喷支护与注浆加固区,同时,应采用桁架、格栅等构件形成封闭支护结构和有效承载环,防止巷道发生滑动失稳破坏。
Aiming at the problem of internal deformation measurement in deep rock mass physical model test, a new method of simulating transparent rock mass analogy was used. By using digital speckle correlation deformation measurement technology developed by ourselves, , The deformation and rupture law of the surrounding rock of deep round soft rock roadway under non-tectonic stress was obtained. The results show that: 1) The proposed method of artificial filling with transparent rock mass can effectively guarantee the implementation and precision of digital photogrammetric deformation measurement; 2) The radial displacement of surrounding rock and its distance from the surface of tunnel are different at different depths (3) the number of macroscopic cracks, the total length and the width of the rupture area of the surrounding rock show an exponential growth relationship with the buried depth, while the ruptured fractal dimension shows a linear growth relationship with the buried depth; 4) At the same time, the closed support structure and effective bearing ring should be formed by the truss, grille and other components to prevent the sliding instability of the roadway.