煤矿安全2019，Vol.50Issue(5)：257-262,6.DOI:10.13347/j.cnki.mkaq.2019.05.062
工作面坚硬顶板破断特征与覆岩运移规律
Fracture Characteristics of Hard Roof and Overlying Rock Movement in Working Face
摘要
Abstract
In view of the problem that the characteristics of roof breaking and the law of overburden rock movement in hard roof fully mechanized caving face are not clear in actual production, the safety of working face is seriously affected. In this paper, based on the engineering background of 8201 working face in a certain mine, the characteristics of roof breaking and the law of overburden rock movement in fully mechanized top-coal caving face with hard roof are studied and analyzed by theoretical analysis, numerical simulation and field measurement. The results show that the uniaxial compressive strength of lamprophyre is about 45 MPa, the non-joint is 90.99 MPa and the uniaxial tensile strength is 7.3 MPa to 9.4 MPa. In the process of fracture, the stress model of roof is obtained, and the first step distance of basic top is 47.57 m, and the first step distance of 8201 basic roof is about 45 m and the distance of periodic pressure is about 20 m by numerical simulation. The average initial top pressure is 46 m, the interval of periodic pressure is 18.7 m to 20.8 m, and the influence range is 1.7 m to 5.6 m. There is little difference between the results of field measurement and theoretical analysis and the results of numerical simulation.关键词
综放开采/坚硬顶板/顶板破断特征/覆岩运移规律/巷道支护Key words
fully mechanized caving mining/hard roof/roof breaking characteristics/overburden movement law/roadway support分类
矿业与冶金引用本文复制引用
郑上上,孔德中..工作面坚硬顶板破断特征与覆岩运移规律[J].煤矿安全,2019,50(5):257-262,6.基金项目
国家自然科学基金资助项目(51474218) （51474218）
