Abstract:

Based on the ultra-high mining roadway about 5.2×7.5m in thick coal seam appeared in SONG Jia-gou coal min. Distribution characteristic between height 3.5-7.5m is simulated in surrounding rock mass plastic zone: the plastic zone distributes in a half-circle in roof, floor and two sides. The area and depth of the plastic zone in two sides increase obviously with the increasing of roadway height. The roadside relative convergence,roof convergence,floor heave is proportional to the roadway height. Based on the distribution of the plastic zone and the current support method, timely support technology with high-strength and high-pre-tightening force and reinforced support technology with diagonal cable are put forward. The support parameters are determined based on engineering analogy method and theoretical analysis. The case proves that the total convergence of relative side- side and roof-floor relative are 150mm and 104mm respectively and provides references for similar conditions.

Key words: thick coal seam, ultra-high, control, support