摘要
双巷掘进小煤柱护巷工艺中,保留巷道受两次工作面采动影响,尤其是第一工作面对其影响最甚。在深部厚煤层坚硬复合顶板的复杂地质条件下,保留巷道不仅矿压显现更加明显,还极易诱发强矿压现象。为防控双巷掘进小煤柱护巷工艺中保留巷道大变形及强矿压灾害,以赵庄煤业为背景,结合厚煤层坚硬顶板上覆岩层运移破断规律,提出“切顶爆破+预裂爆破+水力压裂”的综合卸压方案;运用理论分析、数值模拟与现场试验等方法,对卸压孔深度、卸压孔角度、导向孔直径等参数展开分析与优化设计;在赵庄煤业1313工作面进行现场应用,结果表明,该方法能够有效降低深部厚煤层坚硬复合顶板条件下双巷掘进小煤柱护巷工艺中保留巷道受工作面采动的影响。
Retained roadways in the technology of small-coal-pillar roadway protection in double-roadway extraction are disturbed twice by working face mining,especially the first working face mining.Under the complicated geological conditions of hard composite roofs in deep thick coal seams,the retained roadways present more obvious mine pressure behaviors and are more prone to strong mine pressure phenomena.This study aims to prevent and control large deformation and severe ground pressure disasters of retained roadways in the technology of small-coal-pillar roadway protection in double-roadway extraction.To achieve this aim,with Zhaozhuang Coal Mine as the background,a comprehensive pressure relief method of"roof cutting blasting+pre-splitting blasting+hydraulic fracturing"was proposed in light of the migration and fracturing law of overburden of hard roofs of thick coal seams.Afterwards,parameters such as pressure relief hole depth,pressure relief hole angle,and guiding hole diameter were analyzed and optimized by theoretical analysis,numerical simulation,and onsite tests.Finally,the proposed comprehensive pressure relief method was applied to the 1313 working face of Zhaozhuang Coal Mine.The onsite application shows that this method can effectively reduce the influence of working face mining on the retained roadways in the technology of small-coal-pillar roadway protection in doubleroadway extraction under hard composite roofs in deep thick coal seams.
作者
郭东明
张伟
李学彬
王恒恺
赵志峰
朱若凡
GUO Dongming;ZHANG Wei;LI Xuebin;WANG Hengkai;ZHAO Zhifeng;ZHU Ruofan(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Safety Engineering,North China University of Science&Technology,Langfang,Hebei 065201,China;School of Civil Engineering,Guizhou University of Engineering Science,Bijie,Guizhou 551700,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期556-566,共11页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51974315)
中国矿业大学(北京)越崎杰出学者计划项目(800015Z11A05)。
关键词
深部厚煤层
坚硬复合顶板
双巷掘进
小煤柱护巷
爆破切顶卸压
deep thick coal seam
hard composite roof
double-roadway excavation
small-coal-pillar roadway protection
pressure relief by roof cutting blasting
