CAJ | 학술논문

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。
침대회채공작면직접과함락주적난제，제출병성공실천료회채공작면직접과함락주적염산연화법。통과실내침포시험、암석역학특성측시、X사선연사등방법，연구암양재불동체적분수염산용액중，침포불동시간후적변화규률，탐토기연화궤제。연구결과표명：1)사질니암역학강도수염산용액침포시간정부대수규률변화；2)사질니암역학강도수염산용액체적분수승고정지수규률강저；3)수염산용액체적분수승고，암양공극솔증가、굴복점변화명현、소성증강，단탄성모량변화불명현；4)주요시유백운모화고령석함량강저인기사질니암항압강도적강저；5)선취합괄적염산용액체적분수、합리침포시간、주액량、합리채매궤절심가이학보공작면정상추진。공정실천표명，본방법안전、가고、고효，가위유사조건하적공작면직접과함락주제공차감화삼고。
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.