近距离薄煤层回采巷道布置及护巷方式研究

为了确定大安山矿＋680m水平9槽近距离薄煤层回采巷道合理的布置方式及护巷方式，根据理论分析和数值模拟，确定了单一煤层开采的开采方案，提出了9槽回采巷道留3～5m窄小煤柱护巷的无煤柱护巷方式，及9上和9下煤层回采巷道采用外错式和内错式的相结合的布置方式，并研究了相应的支护形式。数值模拟结果表明选择无煤柱护巷方式是合理的，留煤柱护巷方_式支承压力的影响范围比无煤柱护巷大2．5倍，煤柱上垂直应力比无煤柱护巷大2．5～7．5MPa。

Study on the Entry's Laying-out and Protection Forms in Contiguous Thin Coal Mining

In order to ascertain the entry＇s laying-out and protection forms reasonably at ＋ 680 m level in Da＇anshan colliery, so, firstly the mining plan was ascertained as single coal seam mining. The entry＇s protection form was designed as non-chain-pillar entry protection, which is reservation 3-5 m small pillar and the entry＇s laying-out was devised as inner and external orientation united form at the basis of theory analysis and numerical simulation and its supporting forms was given correspondingly. The conclusion of numerical simulation indicate that the influence scope of abutment pressure with reservation pillar was 2.5 times than non-chain-pinar and the vertical stress increase 2.5-7.5 MPa with pillar, so the non-chain-pillar entry protection was reasonable.