关键词: 孤岛, 力学机制, 移近量, 平移

Abstract: Based on engineering geological survey of Wuyang Coal Mine 7603 island mining face, researchers have done field investigation and analyzed the mechanism of large deformation in the process of “Inward movement”of two sides in the transportation tunneling, and have concluded that the roadway deformation mechanism is a compound deformation mechanism of Tectonic stress type and gravity deformation mechanism (IIAB)+Structural deformation mechanism of weak layer effects (IIIBA)+Bedding to the impact of structural deformation mechanisms (IIICA) + Random jointed structural deformation mechanism (IIIE). Using deformation mechanism transforming principle, this paper has proposed the supporting idea of “Relying on the top and bottom, controlling two sides”, and put forward a new support scheme. Using Numerical simulation FLAC3D this paper has also made a comparative analysis of the supporting effect of the new program with the original program, and has drawn the conclusion that the plastic zone development area of new program is 106.5 m² per unit less than that of original program. The roof-to-floor convergence of new plan is 65.4% less than the original plan, and the convergence of two sides has reduced by 78.9%. According to these findings, the study has shown that the new scheme can effectively control large deformation of the surrounding rock. The industrial test has shown that the largest roof-to-floor convergence of transportation roadway is about 250 mm, and the maximum amount of two sides convergence is only 350 mm, respectively, 45.9% and 79.2% less compared with the original support scheme; the force of two anchors between 110-160 kN, and the force of anchor wire about 300 kN, have all stabilized at around 15 d, and the roadway surrounding rock has been effectively controlled, so that it could ensure ventilation and safety to meet production needs.

Key words: islands face, mechanical mechanism, the convergence, inward movement