特厚坚硬顶板应变能积聚演化规律研究
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摘要
采用三维有限元软件FLAC~(3D)建立特厚坚硬顶板模型,并利用弹性力学分析得出的由应力分量表示的应变能密度公式编写fish语言,代入数值模拟计算结果揭示了工作面推进过程中采场特厚坚硬顶板岩层能量积聚演化规律及分布特征。研究表明:特厚坚硬顶板岩层应变能分布与其所受应力条件密切相关,煤层开采后,工作面中部顶板岩层中弹性应变能较两端大;随工作面推进,坚硬顶板岩层中积聚的弹性应变能逐渐增加,应变能积聚范围扩大,峰值升高,能量梯度也随之加大。
In the study,an extra-thick and hard roof model was firstly established by the three-dimensional finite element software FLAC~(3D).Based on elastic mechanics analysis,the strain energy density formula expressed by the stress component was proposed.Afterwards,the corresponding fish language was written and used for numerical simulation.By numerical simulation,the evolution law and distribution characteristics of energy accumulation in extra-thick and hard roof rock strata of stope in the advancing process of the working face were revealed.The study showed that the strain energy distribution of extra-thick and hard roof rock was closely related to the stress conditions.After the coal seam mined,the elastic strain energy of the roof rock strata in the middle of the working face was larger than that of the both ends.With the advance of the working face,the elastic strain energy accumulated in the hard roof rock increased gradually,the range of strain energy accumulation expanded,the peak value increased,and the energy gradient increased accordingly.
In the study,an extra-thick and hard roof model was firstly established by the three-dimensional finite element software FLAC~(3D).Based on elastic mechanics analysis,the strain energy density formula expressed by the stress component was proposed.Afterwards,the corresponding fish language was written and used for numerical simulation.By numerical simulation,the evolution law and distribution characteristics of energy accumulation in extra-thick and hard roof rock strata of stope in the advancing process of the working face were revealed.The study showed that the strain energy distribution of extra-thick and hard roof rock was closely related to the stress conditions.After the coal seam mined,the elastic strain energy of the roof rock strata in the middle of the working face was larger than that of the both ends.With the advance of the working face,the elastic strain energy accumulated in the hard roof rock increased gradually,the range of strain energy accumulation expanded,the peak value increased,and the energy gradient increased accordingly.
引文
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[3]李新华,张向东.浅埋煤层坚硬直接顶破断诱发冲击地压机理及防治[J].煤炭学报,2017,42(2):510-517.
[4]夏彬伟,李晓龙,卢义玉,等.大同矿区坚硬顶板破断步距及变形规律研究[J].采矿与安全工程学报,2016,33(6):1038-1044.
[5]潘岳,顾士坦,杨光林.裂纹发生初始阶段的坚硬顶板内力变化和“反弹”特性分析[J].岩土工程学报,2015,37(5):860-869.
[6]潘岳,顾士坦,戚云松.初次来压前受超前增压荷载作用的坚硬顶板弯矩、挠度和剪力的解析解[J].岩石力学与工程学报,2013,32(8):1544-1553.
[7]潘岳,王志强,李爱武.初次断裂期间超前工作面坚硬顶板挠度、弯矩和能量变化的解析解[J].岩石力学与工程学报,2012,31(1):32-41.
[8]孔德磊.采高对采空区下坚硬顶板运动规律影响特征分析[J].煤炭科学技术,2015(S2):39-42.
[9]秦忠诚,刘玉腾,王生超,等.基于微震监测的深埋“两硬”综放面覆岩运动规律研究[J].采矿与安全工程学报,2017,34(1):74-78.
[2]刘长友,杨敬轩,于斌,等.多采空区下坚硬厚层破断顶板群结构的失稳规律[J].煤炭学报,2014,39(3):395-403.
[3]李新华,张向东.浅埋煤层坚硬直接顶破断诱发冲击地压机理及防治[J].煤炭学报,2017,42(2):510-517.
[4]夏彬伟,李晓龙,卢义玉,等.大同矿区坚硬顶板破断步距及变形规律研究[J].采矿与安全工程学报,2016,33(6):1038-1044.
[5]潘岳,顾士坦,杨光林.裂纹发生初始阶段的坚硬顶板内力变化和“反弹”特性分析[J].岩土工程学报,2015,37(5):860-869.
[6]潘岳,顾士坦,戚云松.初次来压前受超前增压荷载作用的坚硬顶板弯矩、挠度和剪力的解析解[J].岩石力学与工程学报,2013,32(8):1544-1553.
[7]潘岳,王志强,李爱武.初次断裂期间超前工作面坚硬顶板挠度、弯矩和能量变化的解析解[J].岩石力学与工程学报,2012,31(1):32-41.
[8]孔德磊.采高对采空区下坚硬顶板运动规律影响特征分析[J].煤炭科学技术,2015(S2):39-42.
[9]秦忠诚,刘玉腾,王生超,等.基于微震监测的深埋“两硬”综放面覆岩运动规律研究[J].采矿与安全工程学报,2017,34(1):74-78.