摘要
为了揭示急倾斜特厚煤层水平分段开采工作面冲击地压机理,以窑街三矿五采区为工程背景,建立力学模型,推导了急倾斜煤层倾向应力表达式,运用数值模拟,分析了开采过程中的应力场、能量场演化规律,通过对现场监测数据的剖析,得到了支架压力及矿震分布特征。研究结果表明:急倾斜特厚煤层受到顶、底板共同作用于煤体,变化趋势相同的“夹持”作用,使垂直于顶、底板及顶、底板附近煤体处于强剪应力区,积聚了较高的能量,且随着开采深度的增加,煤体受剪切作用愈加剧烈,有发生“剪切错动”的趋势。当顶板悬臂达到极限跨距发生破断时,在叠加载荷作用下,易诱发“错动—夹持”型冲击地压。工作面顶板侧至中部附近区域受叠加载荷作用大,冲击地压显现剧烈,底板侧由于周围塑性区的卸压作用,冲击地压显现较弱。监测结果表明:工作面顶板侧及中部附近区域支架压力大,矿震能级高,底板侧支架压力小,附近煤体矿震活动较弱,验证了理论研究结果。
In order to reveal the mechanism of rock burst in horizontal sublevel mining face of steep and extra thick coal seam, a mechanical model is established based on the engineering background of No.5 mining area of Yaojie No.3 coal mine, and the expression of dip stress in steep and extra thick coal seam is derived. The distribution characteristics of mine earthquake and support pressure are obtained. The research results show that the steeply inclined and extra thick coal seam is subject to the “clamping” effect of the roof and floor acting on the coal body with the same change trend, which makes the coal body near and perpendicular to the roof and floor in the strong shear stress area, and accumulate higher energy. With the increase of mining depth, the coal body is subject to more severe shear action, and there is a trend of “shear dislocation”. When the cantilever of roof reaches the limit span and breaks, it is easy to induce “dislocation-clamping” rock burst under superimposed load. The stress concentration from the roof side to the middle of the working face is greatly affected by superimposed load, and the rock burst behavior is severe. The rock burst behavior of the floor side is weak due to the pressure relief effect of the surrounding plastic zone. The monitoring results show that the support pressure is high near the roof side and in the middle of the working face. The energy level of mine earthquake is high, the support pressure at the floor side is low and the mine earthquake activity of the coal body nearby is weak, which verifies the theoretical research results.
作者
王崧玮
曹安业
王华
何江
王正义
薛成春
郭文豪
刘耀琪
马立强
WANG Songwei;CAO Anye;WANG Hua;HE Jiang;WANG Zhengyi;XUE Chengchun;GUO Wenhao;LIU Yaoqi;MA Liqiang(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu221116,China;Laboratory of Mine Earthquake Monitoring and Prevention(Jiangsu),China University of Mining and Technology,Xuzhou,Jiangsu22116,China;School of Civil Engineering&Architecture,Changzhou Institute of Technology,Changzhou,Jiangsu213032,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2022年第4期711-719,769,共10页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51734009,U21A20110,51874292)
江苏省研究生科研与实践创新计划项目(KYCX21_2331,KYCX21_2380)
中国矿业大学实验技术研究与开发项目(S2021Y005)。
