井工一矿19109工作面陷落柱治理研究

通过分析井工一矿19109工作面的地质条件,结合物探对疑似陷落柱区域的确定,再采用钻探的方法进一步确定19109工作面陷落柱的位置和范围,位于19109工作面800 m处陷落柱长50 m、宽40 m、面积2 000 m2、现涌水量125 m3/h,19109工作面底板距奥灰界面39 m。根据陷落柱的位置并结合井工一矿邻近工作面的矿压观测数据,确定陷落柱的加固厚度不得小于45 m,且分3个水平进行注浆加固。注浆方式采用单液浆与双液浆相结合,注浆前需对受注点相关条件进行掌握同时还根据注浆过程中的实际情况及时进行浆液参数配比的校正,正常注浆时压力设定为1~3.5 MPa,终压3.5 MPa。注浆效果的验证采用物探和钻探相结合,确保注浆加固起到阻水效果和工作面回采安全。

井工一矿4号及9号煤层防灭火技术

从煤的炭化程度、含硫量以及矿井生产工艺3方面对井工一矿4号、9号煤层进行自燃风险的分析,4号、9号煤层具有自燃倾向性,结合该矿实际生产情况, 4号、9号煤层在正常回采期间采用加快工作面推进速度、灌浆防灭火和注氮防灭火综合防灭火措施,当工作面推进速度缓慢或者出现特殊情况时需增加其他防灭火措施,同时建立完善的火灾监测监控制度,加强预测预报,确保矿井安全生产。

Cemented backfilling technology with unclassified tailings based on vertical sand silo

A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in vertical sand silo were eventually realized by the addition of an effective flocculating agent (NPA). The results show that the sedimentation velocity of interface between unclassified tailings and water after the addition of NPA increases by 10-20 times, the sedimentation mass fraction of unclassified tailings at the bottom of vertical sand silo is up to 64%, the solid particle content of waste water meets the national standard, and the side influences of NPA can be removed by the addition of fly ash. The industrial test result shows that the system, the addition manner and the equipments are rational, and the vertical sand silo is used efficiently. This developed system is simple with large throughput, and the processing cost is 2.2 yuan(RMB)/m3, only 10%-20% of that by mechanical settlement.

影响浅部煤层开采主要因素分析

本文以中煤平朔集团井工一矿的西部浅部煤层工作面为研究对象,针对开采过程中存在的问题,系统分析影响浅部煤层开采的水文与工程地质因素,即新生界底部松散层富水性程度、基岩面起伏变化、风化带性质、煤层顶板覆岩结构及其岩性等,其研究结果为类似条件的其他矿井安全开采具有一定指导性。