湖区含水基岩风化带下提高开采上限实测

Field Study on Increasing Upper Limit of Mining Under Weathering Zone of Water-bearing Bedrock of Lake Area

为提高湖下压煤安全开采上限,在确保开采引起的覆岩导水断裂带不波及地表水体且保证地面建(构)筑物稳定性和对生产生活不产生影响的前提下,解放湖下压煤,减少煤炭损失,以某矿63209工作面为工程背景,设计断裂带高度观测方案并现场实测工作面导水断裂带最大发育高度,在考虑矿井地质条件基础之上,根据规程要求设计西六采区保护层厚度,确定了西六采区3下煤层湖下开采上限。整理分析现场实测结果可得,63209工作面导水断裂带最大发育高度为57.97 m。西六采区含水基岩风化带为11.5 m,设计保护层厚度13.2 m,最终确定开采上限为-137.67 m。

In order to determine the safety upper limit of coal mining under the lake, to ensure that the cracks in overlying strata caused by mining do not affect the building and have no great influence on the production and life of the ground, to mine the coal under the lake as much as possible to reduce the loss of coal resources, based on the engineering background of 63209 mining face in a coal mine, we design and construct the maximum height of water flowing fractured zone. Considering the geological condition, the thickness of the protective layer of No.6 mining area in the western mining field is designed according to the requirements of the regulation, and the upper limit of Ⅲ lower coal seam under the lake is determined. The results show that the maximum development height of water flowing fractured zone in 63209 working face is 57.97 m. The bedrock weathered zone height of No.6 mining area in the western mining field is 11.5 m. The thickness of the designed protection layer is 13.2 m, and the final mining upper limit is-137.67 m.