A new determination method of hydraulic support resistance in deep coal pillar working face
Guodong Li, Xinlei Li, Heng-Heng Huan, Haixiao Lin, Zi-Yuan Ren, Hao Ren
Abstract
This study addresses hydraulic support resistance determination in deep coal pillar caving faces at Zhaogu No. 2 Mine through integrated theoretical, numerical, and field analyses. Theoretical calculations (empirical estimation: ≥ 15.742 MN; dynamic load coefficient: ≥ 10.975 MN) and a "cantilever beam-masonry beam" composite mechanical model (≥ 16.029 MN) defined the resistance range. Numerical simulations revealed progressive coal pillar stress increase during mining, with stress transitioning from bimodal to unimodal distributions due to superimposed abutment pressure and open-cut stress. Complete pillar failure at 5 m from the open-cut reduced roof capacity, while roof displacement analysis identified 1.8 MPa (16.569 MN resistance) as optimal support intensity. Similarity model experiments validated stress field consistency under 1.8 MPa, confirming effective roof control. Field implementation of ZF18000/21/38D supports demonstrated normal resistance distribution during operation, aligning with theoretical predictions. This framework offers critical guidance for deep coal pillar face support design.