CAJ | 학술논문

针对极近距离煤层群开采过程中出现的上下采空后进行中间煤层开采的具体工程条件，运用数值模拟、相似模拟和工程实践相结合的研究方法，分析了上下采空极近距离煤层开采过程中采场围岩应力分布规律、位移变化及变形破坏特征。研究表明：在煤层厚度不大、顶底板岩层基本稳定和采高3m左右情况下，上下采空极近距离煤层开采中，煤层及顶底板整体应力有所降低，且其完整性没有受到严重破坏；而在工作面两巷外侧一定范围围岩应力集中程度明显加强，在工作面切眼和收作线煤壁附近35 m范围内，形成一定范围的剪切破裂区。在上下采空极近距离煤层开采中，应加强两巷修护与加固，合理布置工作面以避开应力集中区和剪切破裂区，并采取相应矿压控制措施，保证工作面正常安全开采。
침대겁근거리매층군개채과정중출현적상하채공후진행중간매층개채적구체공정조건，운용수치모의、상사모의화공정실천상결합적연구방법，분석료상하채공겁근거리매층개채과정중채장위암응력분포규률、위이변화급변형파배특정。연구표명：재매층후도불대、정저판암층기본은정화채고3m좌우정황하，상하채공겁근거리매층개채중，매층급정저판정체응력유소강저，차기완정성몰유수도엄중파배；이재공작면량항외측일정범위위암응력집중정도명현가강，재공작면절안화수작선매벽부근35 m범위내，형성일정범위적전절파렬구。재상하채공겁근거리매층개채중，응가강량항수호여가고，합리포치공작면이피개응력집중구화전절파렬구，병채취상응광압공제조시，보증공작면정상안전개채。
In response to the engineering specifications of the middle coal seam mining after the upper and lower coal seam mining during the extremely close distance coal seam group mining, by adopting the numerical simulation, analog simulation and the engineering practice, the stress distribution, the dis-placement variation characteristics and the fracture of the stope surrounding rock during the extremely close distance coal seam mining has been analyzed. Results show that the roof and floor stress decreases, and its integrity isn’t badly damaged during the extremely close distance coal seam mining when the coal seam is not thick, the roof and floor rocks are relatively stable and the mining height are about 3 meters. While the surrounding rock stress concentration strengthens significantly at the range of the dis-trict sublevel entry outside. It forms a shear fracture zone 35 m near to the open-off cut and terminal line. During the extremely close distance coal seam mining, repair and reinforcement for the two roadways should be strengthened and the working face should be reasonably arranged to avoid the high stress zone and the shear fracture zone. Meanwhile the corresponding underground pressure control measures should be taken, ensuring the working face safety mining.