Study on deformation evolution law and support technology of surrounding rock in multiple mining roadway

In order to explore the deformation evolution law of surrounding rock in multiple mining roadway and solve the large deformation problem of surrounding rock in the roadway, the 5101 working face of Shanxi Xiangyuan Qiyi Xinfa Coal Industry Co., Ltd. was used as the engineering background, using on-site investigation, numerical simulation and the combination of industrial tests and the evolution law of the surrounding rock deformation and the evolution of the shaping zone during multiple mining were studied. The results showed that with the increasing of mining influence, the deformation of surrounding rock of roadway and the proportion of total deformation increased, which indicated an asymmetric deformation. The deformation depth of roadway surrounding rock in the shaping zone extended, which enlarged the damage area and showed an obvious plastic deformation of the right sidewall. The plastic failure law was roughly the dynamic expansion process of ''the right shoulder angle of the roadway → the right bottom corner of the roadway → the middle right part of the roadway''. Based on the deformation characteristics and laws of roadway surrounding rock, the support scheme was presented. The field industrial test results showed that the support scheme was reasonable and the roadway deformation met the mining face mining needed. The research results could provide reference for surrounding rock control under similar geological conditions. © 2020, Editorial Office of Journal of Mining and Strata Control Engineering. All right reserved.