水仓防隔水煤柱安全评价及注浆加固治理研究

Study on safety evaluation and grouting reinforcement treatment for water-proof coal pillar of mine sump

某煤矿水仓的砌碹巷道在开采的扰动、防隔水煤柱宽度留设不足、砌碹壁后充填不密实等情况下,使得周边采空区水渗漏至水仓,极大影响了水仓的安全稳定。为进一步加强水仓煤柱的稳定性,运用地面钻孔及井下钻孔相结合的方法进行注浆加固。采用地面钻孔注浆充填井下硐室,硐室充填沙子245~328 m^(3)、水泥487~650 t,充填材料体积远远大于硐室体积220 m^(3),有效增加了煤柱厚度;利用井下钻孔在砌碹处进行水泥注浆与水化学注浆,使得砌碹裂缝处涌水量由15 m^(3)/h降至为零,砌碹壁后空隙充填效果良好。通过对煤柱及砌碹壁后空隙的注浆充填,有效提高了水仓防隔水煤柱的稳定性。

Under the influences of adjacent mining disturbance,insufficient width of water-proof coal pillar and incomplete filling behind arch wall,water from adjacent goaf leaks into mine sump through arched roadway in a coal mine,which greatly affects the safety and stability of the mine sump.In order to further strengthen the stability of coal pillar of the mine sump,the combination of ground drilling and underground drilling was adopted to grout and reinforce the mine sump.The underground chamber was filled by ground drilling grouting with 245-328 m^(3)of sand and 487-650 tons of cement,the volume of filling materials was much larger than the chamber volume of 220 m^(3),effectively increasing the thickness of the coal pillar.Using underground drilling to carry out cement grouting and hydrochemical grouting at the arch wall,the water inflow at the cracks of the arch wall was reduced from 15 m^(3)/h to zero,and the filling effect of the gaps behind the arch wall was good.Through the grouting filling of coal pillar and the gap behind arch wall,the stability of water-proof coal pillar in the mine sump was effectively improved.