Study on the interaction between strata movement and support in pitching oblique mining area of steeply dipping seam
To study the movement and support interaction law of surrounding rock in steeply dipping seam pitching oblique mining area,a combination of physical simulation experiment,numerical calculation,and on-site monitoring was used to study the three-dimensional move-ment and filling characteristics of surrounding rock in pitching oblique mining area.The stress transfer and transformation law between roof rock layers under non-uniform filling was ana-lyzed in depth,revealing the interaction relationship between the"support surrounding rock"system.The research results indicate that the failure and movement of surrounding rock in pitching oblique stopes are different from those in true inclined stopes.Due to the mutual influ-ence of the regional stability transformation of the suspended immediate roof and the distribu-tion characteristics of sliding gangue,the compaction degree of filling gangue in goaf decreases,the effective filling range increases,and the damage degree of the middle and upper roof decreases.The fracture sequence of the main roof has evolved from the initial inclined"up-per—lower—middle"to the periodic inclined"middle—upper—lower".The fractures are in a pseudo inclined"O-X"shape,the middle and upper fracture range is first small and then large,the lower fracture range is first large and then small,and the strike caving step is in-creased.The roof stress transfer path propagates between different rock masses and layers,and the stress arch foot transfers to the roof above the lower gangue.The middle abutment pressure is the largest,and the upper area is the smallest.The immediate roof of the mining area undergoes layered tensile failure,and the main roof undergoes columnar shear failure along the vertical direction.The degree of damage in the middle is greater than that in the up-per part and lower part.The plastic zone of the roof develops from the immediate roof to the main roof and extends clockwise from the upper to the middle.The interaction relationship be-tween the"support surrounding rock"in pitching oblique mining area is influenced by the in-teraction between multiple systems,and the dynamic interaction of the"gangue-support-sup-port"system is the main reason for the instability of the support.Based on production practice,in response to the instability and failure of the support under an unbalanced load in the working face,as well as the dynamic disasters caused by the suspended roof,the support resistance,inter-frame stability,filling characteristics of gangue,and structure of the support were artificially controlled,and good results were achieved.
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