摘要
充填与垮落协同开采技术发挥了综采“高产高效”与充采“绿色环保”的双重技术优势,目前对协同开采覆岩移动变形的研究已取得了一定的成果,但忽略了岩层层间的滑移效应对覆岩移动的影响。基于充填与垮落协同开采技术原理与工艺,根据协同开采覆岩结构特征,建立协同开采覆岩复合岩梁滑移力学模型,解出双层复合岩梁挠度、滑移、剪力和弯矩的理论解,分析复合弹性地基系数k对四者的影响规律,并通过物理相似模拟试验得出不同充实率条件下覆岩层间滑移规律;研究认为,采用充填与垮落协同开采方法时,受到同一工作面中同时布置充填段和垮落段的影响,双层复合岩梁四者理论解较垮落法的单一开采均发生突变,四者统计数值随复合弹性地基系数k的变化规律具有一致性,均可划分为快速降低区、缓慢降低区和平稳区,并计算得出滑移效应影响下的充填段临界充实率为93.75%;将理论计算与物理模拟结果进行对比分析,知充填段与垮落段覆岩均向协同工作面中央位置移动,验证了滑移模型的合理性。
Backfilling collaborate with caving fully-mechanized mining(BCCFM)has exerted a dual technical advantage of fully-mecha⁃nized coal mining and backfill mining,achieves green environmental protection while ensuring high productivity and high efficiency.At present,the research on the movement and deformation of overlying rock in collaborative mining has achieved certain results,but it neglects the influence of interfacial slip effects on the overlying strata movement.Based on the principle and process of the filling and caving collab⁃orative mining technology,and according to the structural characteristics of the collaborative mining overlying rock,this paper established a sliding mechanics model of the composite rock beam in the collaborative mining overlying rock,and solved the deflection,slip and shear of the double-layer composite rock beam,analyzed the influence of the coefficient of elasticity foundation k on the four parameters,obtained the slippage law of overlying strata under different conditions of backfilling ratio by physical similarity simulation experiment.The research shows that when the backfill and caving cooperative mining method is adopted,due to the influence of the simultaneous arrangement of the backfill section and the caving section in the same working face,the four theoretical solutions of the double-layer composite rock beam are abruptly compared with the single mining method of the caving method.The statistical value of the four factors change with k in the same law,the curve can be divided into three parts:rapid reduction zone,slow reduction zone and smooth zone.The calculation shows that the critical backfilling ratio of the filling section under the influence of the slip effect is 93.75%;the theoretical calculation and physical simulation results are compared and analyzed,and it is known that the overlying rock in the filling section and the caving section moves to the center of the cooperative working face,which verifies the rationality of the slip model.
作者
郭宇鸣
刘恒凤
殷伟
朱存利
董超伟
夏康祺
GUO Yuming;LIU Hengfeng;YIN Wei;ZHU Cunli;DONG Chaowei;XIA Kangqi(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining&Technology,Xuzhou 221116,China;The Key Laboratory for Traffic and Transportation Security of Jiangsu Province,Huaiyin Institute of Technology,Huaian 223003,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2022年第5期92-103,共12页
Coal Science and Technology
基金
江苏省普通高校自然科学研究计划资助项目(KJB440004)
中国矿业大学未来科学家计划资助项目(2022WLKXJ005)
江苏省研究生科研与实践创新计划资助项目(KYCX22_2611)。
关键词
协同开采
复合岩梁
绿色开采
层间滑移
覆岩移动
collaborative mining
composite rock beam
green mining
interlayer slip
overburden movement
