深井采空区宽条带煤柱受力状态研究

Study on Stress State of Wide Strip Pillar in Gobs of Deep Mines

为研究深井采空区宽条带煤柱受力状态，对唐口矿千米深矿井宽条带开采采空区煤柱受力状态进行了实际观测和分析。结果表明：距煤柱边缘6～8m区域为压力峰值区，距边缘10m区域承栽附加应力较小；在锚网带支护系统作用下，煤壁边缘并不完全坍塌垮落；越靠近煤柱内部，其实际支撑能力越欠，在距边缘1m区域的煤柱实际强度约为10．2MPa；深井覆岩外应力拱所需承载的覆岩重量要比浅井大得多，煤柱外应力场峰值和影响范围都明显大于浅井。

In order to study the stress state of wide strip pillars in gobs of deep mines, the stress state of wide strip pillar in Tangkou Coalmine in 1 000 m deep was observed and analyzed. The zone 6-8 m away from the edge of the coal pillar is the peak pressure area, and the zone 10 m away from the edge bears smaller additional stress. Under the action of support systems with the strip of belt and wire mesh, the edges of coal pillar do not completely collapse and the nearer toward the pillar center, the greater its actual support capacity is. The actual strength of the area 1 m away from the edge is about 10.2 MPa. External stress arch in deep mine bears much more weight of overburden rocks than that in shallow mine, and the peak value and impact scope of external stress field are much higher and larger in deep mine than that in shallow mine obviously.