工作面直接过陷落柱的盐酸软化法及其试验研究  

Experimental study on coal face direct passing collapse column by hydrochloric acid softening method

作　　者：赵国飞[1] 康天合[1] 杨永康[1] 郭俊庆[1] 张文阳[1] 

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024

出　　处：《采矿与安全工程学报》2014年第1期97-101,107,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50974093;51174141;51004075);山西省科技攻关(工业)项目(2011032101504);山西省青年科技研究基金项目(2011021024-2);山西省高校青年学术带头人支持计划项目(2012)

摘　　要：针对回采工作面直接过陷落柱的难题,提出并成功实践了回采工作面直接过陷落柱的盐酸软化法。通过室内浸泡试验、岩石力学特性测试、X射线衍射等方法,研究岩样在不同体积分数盐酸溶液中,浸泡不同时间后的变化规律,探讨其软化机制。研究结果表明:1)砂质泥岩力学强度随盐酸溶液浸泡时间呈负对数规律变化;2)砂质泥岩力学强度随盐酸溶液体积分数升高呈指数规律降低;3)随盐酸溶液体积分数升高,岩样孔隙率增加、屈服点变化明显、塑性增强,但弹性模量变化不明显;4)主要是由白云母和高岭石含量降低引起砂质泥岩抗压强度的降低;5)选取合适的盐酸溶液体积分数、合理浸泡时间、注液量、合理采煤机截深可以确保工作面正常推进。工程实践表明,本方法安全、可靠、高效,可为类似条件下的工作面直接过陷落柱提供借鉴和参考。In order to solve the problem of coal face direct passing collapse column, hydrochloric acid softening method of coal face direct passing collapse column is proposed and carried out successfully. Through the methods of laboratory immersion test, rock mechanical characteristics test, X-ray diffrac-tion and so on, the change law of rock sample in different concentrations hydrochloric acid, soaking time and its softening mechanism are studied. The study results show as follows： 1） The mechanical strength of sandy mudstone is negative logarithmic law changes with soak time of hydrochloric acid so-lution;2） The exponential law of the mechanical strength of sandy mudstone decreases with hydroch-loric acid solution concentration increasing;3） With hydrochloric acid solution concentration increasing, its porosity increase, yield point is obvious and plastic to raise, but its elastic modulus changes insigni-ficantly; 4） The decrease in the contents of muscovite and kaolinite mainly lead to the decreased me-chanical strength of sandy mudstone; 5） Suitable hydrochloric acid solution concentration, soak time, the amount of injecting liquid and the cutting depth of the shearer can make sure of coal face’s normal advancement. Practical application shows that this safe, reliable, efficient method can provide references for coal face direct passing collapse column under similar conditions.

关 键 词：回采工作面 直接过陷落柱 盐酸软化 试验研究 

分 类 号：TD803[矿业工程—矿山开采]