关键词: 透明岩体, 数字照相量测, 人工制斑, 变形破裂

Abstract: In the physical model test of deep rock, the measurement on the internal deformation and rupture is a challenge. In order to solve the problem, based on the transparent rock simulation experiment, the digital speckle correlation deformation measurement method has been adopted and the spot methods have been further studied. On the basis, spatio-temporal evolution law of the internal deformation and rupture in deep circular tunnels without tectonic stress has been obtained. The conclusions are as follows: 1) the artificial filling spot method of transparent rock presented in this article could guarantee the implementation and accuracy of digital photographic deformation measurement; 2) under different buried depths, the radial rock displacement at the roof, bottom and two sides is in an exponential attenuation relationship with the distance from the roadway surface; 3) the number and overall length of macroscopic crack as well as the width of failure zone are in an exponential growth relationship with the depth, and the rupture fractal dimension satisfies linear growth condition with the depth; 4) under the tectonic stress, the shallow rock in the two diagonals should be key supporting parts around deep circular roadway. In addition to spraying anchor supporting of roadway, grouting reinforcement is necessary to the shallow rock in two sides and diagonal. The supporting structure around the tunnel should be linked into a unified whole unit by truss and grilling, forming an effective bearing ring to prevent sliding instability failure of roadway.

Key words: transparent rock, digital photogrammetry, artificial spotting, deformation and fracture