非对称综放开采煤层三维应力分布特征及其层厚效应研究

基于非对称综放开采布置特点,以谢桥煤矿1151（3）综放面地质技术条件为背景,采用计算机数值模拟,并结合现场实测研究,揭示非对称开采煤层三维应力分布及一次开采煤厚变化对应力分布的影响规律。研究结果表明,非对称开采工作面煤层应力呈非对称分布,煤柱侧工作面煤层应力峰值及其超前距离和应力降低区的范围最大;随一次开采煤厚的增加,煤层应力峰值降低,峰值距煤壁的距离增大,应力向煤层深部煤体转移。研究为煤柱合理留设、巷道合理布置、采场围岩稳定性控制、提高煤炭资源采出率、安全高效开采等方面提供理论依据。

STUDY ON DISTRIBUTION CHARACTERISTICS OF 3D STRESS AND THICKNESS EFFECTS OF COAL-SEAM IN UNSYMMETRICAL DISPOSAL AND FULLY-MECHANIZED TOP-COAL CAVING

In order to explore the influence of mining heights on the three-dimensional stress distribution of coal-seam in unsymmetrical disposal and fully-mechanized top-coal caving,based on unsymmetrical disposal characteristics,the analyses of numerical simulation and in-situ observation are synthetically applied according to the geological and technical conditions of the working face 1151(3) in Xieqiao Mine.The characteristics of 3D stress distribution of coal-seam and its thickness effects are obtained.The results show that the seam stress on working face represents unsymmetrical distribution in unsymmetrical disposal;and the abutment pressure peak value and its distance to face and stress-relaxed area are maximum at the side of coal pillar.The coal-seam thickness effects behave that the stress peak value and 3D stress distribution of coal-seam are changed with mining height changing.The seam-stress peak value decreases with the increasing of mining height,but the distance between peak value location and coal-seam wall augments and the abutment pressure shift to further coal-seam wit the increasing of the mining height.The study will provide lots of theoretic references to reasonable preservation of coal pillar,layout of gateway,stability control of surrounding rock,increment of the recovery ratio and efficiency of caving,etc..