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Stability of multi-dimensional system of parallelogram support in pseudo-inclined longwall fully mechanized mining face of steeply dipping coal seam

Wang Tong, Yang Ke, Wu Yongping, Xie Panshi, Chi Xiaolou

Archives of Mining Sciences

2025

Vol. 70, no. 3

423--452

The key to safe and efficient mining of pseudo-inclined working face of steeply dipping coal seam is the stability control of the ‘support–surrounding rock’ system. Based on the comprehensive determination of the load characteristics of the support in the working face, the overall stability and internal component load characteristics of the parallelogram hydraulic support under the influence of different factors are analyzed. The results show that: (1) The working resistance of the column gradually decreases with the increase of the angle of seam; the working resistance of the balance jack, and the force of the front and back link all increase with the increase of the angle of seam. (2) The working resistance of the column and the working resistance of the balance jack increase, and the inclined and strike components of the constraint force of the hinge point of the top beam–shield beam change greatly. The top beam of the support is affected by the eccentric load, which affects the stability of the support and is prone to falling and sliding. (3) The parallelogram support also reaches the maximum stress at the connection between the column and the top beam, and the stress of the shield beam is relatively small.