摘要
采用物理相似模拟实验及理论分析,研究单层开采和重复采动条件下覆岩移动、裂隙分布与演化规律、支承压力分布特征及采动裂隙椭抛带形态。研究结果表明,上覆岩层在重复采动条件下,形成破断裂隙和离层裂隙,两者联通后在空间形成不同于单层煤开采的覆岩裂隙椭抛带展布;下层煤回采期间,随工作面的推进,工作面附近的应力峰值与煤壁距离保持相对稳定的状态;在重复采动双重卸压条件下,覆岩裂隙经历了产生、扩张、压实、再扩张、再压实等5个动态变化阶段。最后在实验分析基础上,建立近距离煤层重复采动裂隙椭抛带的空间分布数学模型。
Through physical similar simulation experiments and theoretical analysis, the paper studies the monolayer mining and repeated mining overlying strata movement, fracture distribution and evolu- tion laws, characteristics of abutment pressure distribution and mining-induced fissure elliptic parabol- oid zone. Research results have shown that fracture fissure and separation fractures formed during re- peated mining, in the overlying strata; the two fractures after linking together form an elliptic paraboloid zone in space different from that of the single coal seam. During stoping in the lower seam, with the advancement of working face, the peak stress near the working face and coal wall distance keep rela- tively stable; under the condition of repeated mining and dual pressure relief, strata fractures has ex- perienced 5 dynamic changes： production, expansion, compaction, re-expansion, and re-compaction. Finally on the basis of experimental analysis, the spatial distribution of mathematical model of close distance coal seam repeated mining fissure elliptic paraboloid zone has been established.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2016年第5期904-910,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51327007
51174157
51104118
51204134)
西安科技大学大学生创新创业训练计划项目(201410704001)
关键词
重复采动
椭抛带
裂隙演化
碎胀系数
repeated mining
elliptic paraboloid zone
fracture evolution
coefficient of bulk increase
