Abstract: The paper studies the impact of different parameters on two-sided displacement and convergence between roof and floor by using orthogonal numerical simulation test method. Six factors such as roadway width, roadway height, burial depth, lateral pressure coefficient, strength of surrounding rock and support strength, and three levels of orthogonal experiment method are selected to conduct FLAC numerical simulation test. The simulation results by variance analysis method is analyzed and industrial tests in the underground is conducted. The results show that the six factors have some impact on the two-sided displacement and convergence between roof and floor, but the impact levels are different. The order of the magnitude of factors affecting two-sided displacement is strength of surrounding rock, support strength, burial depth, lateral pressure coefficient, roadway height, roadway width; the order of the magnitude of factors affecting convergence between roof and floor is strength of surrounding rock, support strength, burial depth, lateral pressure coefficient, roadway width, roadway height. Test results tested in the underground are well consistent with numerical simulation results, which indicates that there are certain degree of reliability to guide field support work with orthogonal simulation method.

Key words: orthogonal numerical simulation test, two-sided displacement, convergence between roof and floor