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| Study on asymmetric deformation mechanism of surrounding rock of roadway under the effect of isolated coal pillar |
| ZHAO Hongbao，CHENG Hui，LI Jinyu，WANG Tao，LIU Yihong，QIN Fengyuan |
| (School of Energy and Mining Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract By means of on-site monitoring and theoretical analysis，this paper reveals the asymmetric deformation mechanism of 1021 roadway which is under the influence of isolated island coal pillar in #10 coal seam in Shanxi Province. And a reasonable roadway support is put forward. The results show that：The abutment pressure of isolated coal pillar will cause stress changes in the floor. The angle between the principal stress and the horizontal direction of 1021 roadway is 19°. The maximum principal stress comes from the direction of isolated coal pillar and the minimum principal stress comes from the direction of goaf above the roadway. The deflection of the principal stress leads to the development of the plastic zone of the roadway surrounding rock in a diagonal pattern，and the roadway presents asymmetric damage. The position of the maximum bending moment of the roadway top beam increases with the asymmetric coefficient λ of the load. And the position will gradually approach the side of the roadway near the isolated coal pillar. The maximum bending moment increases linearly with the increase of λ. The column support should adopt the asymmetric form. The floor heave type of roadway belongs to compound floor heave. The roadway direct floor is flexure fold floor heave. The position of the maximum floor heave is shifted with the change of asymmetric coefficient λ. When λ = 2，it is symmetrical. The basic floor is an extrusion flow floor heave. The displacement velocity of the floor plate increases continuously in the process of being far away from the isolated island coal pillar，the angle between the velocity and the horizontal direction also increases. It leads to the asymmetry of floor heave. Finally，according to the deformation characteristics of 1021 roadway surrounding rock，the paper puts forward the asymmetric support suggestions of roof and floor.
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2020, Vol. 39 
