厚风氧化带注浆改性后采场矿压显现特征分析

徐华生 彭世龙 荣传新 程桦 侯俊领

摘 要：针对淮南矿区顾北矿南二采区1512（3）工作面近厚风氧化带开采的地质特征，采用J型水平羽翼分支孔对厚风氧化带进行地面预注浆加固。在注浆改性加固的基础上，对工作面开采矿压实施监测。通过监测结果，对风氧化带整体注浆改性后采场矿压显现特征进行了分析。结果表明：风氧化带整体注浆加固后，工作面来压呈现大小周期现象；工作面老顶初次来压步距平均值为31.5m，前12个周期来压步距平均值为13.20m，初次来压步距及周期来压步距均稍大于类似条件下的工作面。该研究成果对近厚风氧化带下安全高效采煤具有重要的指导意义。

关键词：厚风氧化带；无关键层；J型注浆；矿压

中图分类号： TD32 文献标志码：A

文章编号：1672-1098（2017）06-0076-06

Abstract：According to the geological features of near thick wind oxidation zone in the second mining area 1512 （3） working face in south Gubei Mine of Huainan mining area， using the J type horizontal wings branch hole the thick wind oxidation zone was reinforced with grouting. On the basis of grouting modification and reinforcement， mining face pressure was monitored. Through the monitoring results， behavior characteristics of the stope ground pressure in the wind oxidation zone being grouted and modificated were analyzed. The results showed that： after the overall grouting in the wind oxidation zone， the working face pressure on displayed the periodic phenomenon； the average of the first roof weighting pace was 31.5m on the working face roof and in the first 12 week period the roof weighting pace averaged 13.20m， the first weighting pace and periodic weighting pace were slightly larger than the working faces under the similar conditions. The research results have important guiding significance for safe and efficient coal mining under near the thick wind oxidation zone.

Key words：thick wind oxidation zone； no key stratum； J grouting； mine pressure

综采工作面的顶板控制一直是采矿学科研究的核心问题之一。采场中一切矿压显现的根源是采动引起的上覆岩层的运动，由于上覆岩层的岩性、厚度、层位关系及构造情况不同，存在着多种多样的运动规律[1-4]。近年来，我国已经发生数十起松散含水层下采煤压架致灾事故，并且综采面压架致灾呈现增多趋势，特别在薄基岩厚风氧化带下发生压架致灾事故尤为突出，造成了重大的经济损失，严重威胁煤矿安全生产，因此，引起行业领导和众多学者关注[5-10]。目前，国内对风氧化带的处理方面有一些相关的工程实践研究，用途较为广泛的主要在立井井筒建设过程中，通过对风化带开展地面预注浆，起到了加固和封水效果[11-15]。……