Lu'an Mining (Group)Corporation Limited Mining Branch,China Coal Research IlnstituteDepartment of Mining and Design,Tiandi Science and Technology Company Limited

针对煤矿采煤工作面破碎煤岩体深孔高压注浆过程中,化学浆成本较高、用量大,普通硅酸盐水泥浆液结石体与煤体黏结性较差的问题,开发了应用于普通硅酸盐水泥浆改性液,并对其进行了改性水泥基注浆材料黏度、结石率、‘8’字模抗拉强度及锚杆拉拔条件下浆液结石体黏结性能等物理力学性能的实验室分析。结果表明,当水泥改性液用量不大于20%时,对浆液的流动性影响较小,满足高压深孔注浆浆液的要求;不同水灰比条件下,浆液结石率都在98%以上,改性液对浆液的结石率效果提升不是很明显,但不会造成结石率降低;锚杆拉拔条件下黏结性能试验表明,水灰比为0.7∶1.0,改性液用量为15%时,结石体黏结性能最好。高压深孔注浆宜采用单液水泥浆,水玻璃添加量为水泥质量的3%~4%,水泥改性液用量为水泥浆液用量的15%~20%为宜。采用改性水泥基注浆材料在山西潞安常村煤矿N1-3孤岛工作面收尾期间进行了高压深孔注浆井下试验,现场试验表明,浆液消耗量及注浆成本大幅降低,并缩短了收尾工期。

According to the high cost and high consumption of the chemical grout in the deep borehole high pressure grouting process of the broken coal and rock mass in the coal mining face,there was a poor binding problems between the rook binding mass and coal mass with the ordinary Portland cement grout.a modified liquid applied to the ordinary Porland cement grout was developed. A lab analysis was conducted on the vwscosity,.calculi rate,8 type model tensile strength,bonding performances of grout binding rock under the bot ulling conition as well as otherophysical and mechanical performances of modified cement base grouting material.The results showed that when the dosage of the cement modfiedliquid was not over 20%,the dosage would have less infuences to the fluidity of the grout and could meet the requirements of the grout for the high pressure deep borehole grouting.Under the condition of the different water and cement ratio,the calculi rate of the grout would be over 98%,themodified liquid would not be obvious to improve the calculi rate of the grout and would not make the calcul f the bolt pulling,the bond performances test showed that when the water and cement ratio was 0.7 ∶ 1.0 and the modified liquid dosage was 1 5%,the bonding performances of the rock binding mass would be best.The high pressure deep borehole grouting would be better to have a singe cement grout,the sodium silicate volume would be 3%～4% of the cement quantity and the dosage of the cement modifed liquid would be 15%~20% of the cement grout quantty.The modified cement base grouting material was applied to the underground mine test of the high pressure deep borehole grouting during the terminal period of N1-3island coal mining face in Lu an Changcun Mine. The sie est showed that the grout consumption volume and grouting cost were highly reduced and the terminal period was shortened.

国家自然科学基金煤炭联合基金重点资助项目(U1261211)；天地科技创新基金资助项目(KJ-2015-TDKC-08)；