摘要
为了改善顾桥煤矿大采深和工作面采动影响引起的煤岩高应力环境,保证工作面停采后系统巷道的安全留设,以矿井1311(1)工作面停采后的系统巷道保护为目标,采用理论分析和现场实践实测方法,探索工作面顶板超前预裂应力阻隔护巷机理.研究表明:覆岩悬板作用是停采工作面煤岩高应力显现的主要力源组成;通过建立停采工作面覆岩结构力学模型,采用等效应力指标较好地反映了煤层高应力承载特征,揭示了悬板作用下的覆岩应力传递机制,明确覆岩悬板是诱发煤岩高应力的敏感因素,煤层开采扰动范围内的悬板必须及时切断,阻断高应力传载路径;通过合理确定覆岩控制目标层高度,提出利用工作面顺槽联巷爆破切顶阻断高应力传递的卸压思路,给出了重型药柱深孔爆破工艺参数,顶板平面致裂及卸压效果显著.
To ensure the stability of the underground structures,such as roadways that are exposed to high mining-induced stress in Guqiao Coal Mine,an approach known as roof pre-splitting(to stop the stress transfer)is proposed to ensure the stability of roadways at No.1311(1)working face after theoretical analysis and on-site monitoring.The results show that the structure‘cantilever plate'is the major cause that leads to high stress at the working face.By establishing a mechanical model of the overlying rock strata,an equivalent stress is used to reflect the high-stress-bearing capacity of the coal seam,and the stress transfer mechanism inside the overlying strata is revealed as well.Therefore,to make sure the stability of the roadway,the cantilever plate within the disturbance range of mining activity should be cut off in time to stop the high stress from transferring.Given this condition,a blasting method along the roadways is put forward to relieve the high stress.Besides,it can block the transmission of stress as expected.Moreover,the parameters of deep-hole blasting with heavy-duty grain columns are provided.The application turns out that the effects of roof cracking and stress relief with roof pre-splitting are significant.
作者
杨敬轩
张瑞
卢硕
孙兴平
陈建本
YANG Jingxuan;ZHANG Rui;LU Shuo;SUN Xingping;CHEN Jianben(School of Mining Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Guqiao Coal Mine,Huainan Mining Co.,Ltd.,Huainan,Anhui 232033,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2024年第2期264-276,共13页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(52074261)。
关键词
顶板预裂
切顶卸压
应力阻隔
爆破切顶
等效应力
roof pre-splitting
roof cutting and pressure releasing
stress barrier
blasting cutting
equivalent stress
