摘要
冲击地压是对采矿安全和经济造成重大威胁的一个主要工程灾害。为探究长壁工作面顶板破断诱发的冲击地压机理。基于弹性地基理论建立了有限弹性梁模型,研究了长壁工作面冲击地压的因果机制。对基本顶破裂过程及相关参数进行了分析。结果表明:在一定的阻尼阻力下,基本顶的运动呈现自由振动。同时发现,随着基本顶厚度和弹性模量的增加,基本顶的主导振动频率也会增加。在基本顶振动过程中,施加在煤体上的垂直应力得到了卸载。基本顶-煤体界面的卸压作用导致了巷道帮部煤体在水平地应力下进入巷道,从而导致冲击地压。随着基本顶强度和厚度以及煤体内水平地应力的增加,冲击地压的可能性也会增加。这一机制解释了长壁工作面巷道中冲击地压机理,为长壁工作面冲击地压的预防和控制技术提供了理论基础。
Rock burst is a major factor that poses a major threat to mining safety and economy.To explore the mechanism of rock burst induced by roof rupture of longwall face.Based on the elastic foundation theory,a finite elastic beam model is established to study the cause-and-effect mechanism of rock burst in longwall roadway.The fracture process of basic roof and related parameters were analyzed.The results show that the motion of the basic roof exhibits free vibration under certain damping resistance.It is also found that the dominant vibration frequency of the basic roof increases with the increase of the thickness and elastic modulus of the basic roof.During the basic roof vibration process,the vertical stress placed on the coal body is relieved.The depressurization of the basic top-coal body interface causes the coal body on the side of the roadway to enter the roadway under horizontal earth stress,which leads to rock burst.With the increase of basic roof strength and thickness and horizontal ground stress in coal,the possibility of rock burst will also increase.This mechanism explains the rock burst mechanism in longwall roadway and provides a theoretical basis for the prevention and control technology of rock burst in longwall roadway.
作者
杜刚
王超
刘锋
DU Gang;WANG Chao;LIU Feng(Shanxi Shiquan Coal Industry Co.,Ltd.,Changzhi 046200,China;Shenyang Research Institute Co.,Ltd.,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)
出处
《煤矿现代化》
2024年第3期123-127,共5页
Coal Mine Modernization
基金
中煤科工集团沈阳研究院创新引导项目(SYYD-21WS-002)。
