摘要
覆岩裂隙带高度是研究覆岩变形破坏的重要指标,而现有单一指标无法反映空间采场围岩不同空间部位的破裂程度。本文以神东典型浅埋条件保德矿81505工作面为研究背景,基于室内实验对岩体破裂度进行了RFD阈值划分并构建相似模型和数值模型;基于围岩破坏度指标RFD提取了数值模拟中的最大破坏深度,并对比相似模拟结果研究了覆岩采动裂隙带发育高度规律及随采高的变化规律。结果表明,围岩破坏度指标RFD可以很好地评测神东典型浅埋条件下采动裂隙带的发育特征,裂隙带发育高度随采高的增大而持续增高,但增长速率逐渐减小。本研究为裂隙带分布破坏特征、矿压显现及安全开采提供理论支撑及技术依据。
The height of overburden fissure zone is an important index to study the deformation and failure of overburden,but the existing single index can not reflect the fracture degree of surrounding rock in different space parts of stope.Based on 81505 working face of Baode Mine with typical shallow burial conditions in Shendong,the unification of coal sample damage degree and index RFD(Rock Failure Degree)is completed by laboratory experiments,and a similar model and a numerical model are constructed.Based on the index RFD,the maximum destructive depth in numerical simulation is extracted,and the law of development height of overburden mining fissure zone and its variation with mining height are studied by comparing similar simulation results.The results show that the index RFD can well assess the development characteristics of mining fissure zone under typical shallow burial conditions in Shendong.And the development height of fissure zone continuously with the increase of mining height but the growth rate decreases gradually.The research in this paper provides theoretical support and technical basis for distribution and destruction characteristics of fractured zones,occurrence of rock pressure and safe mining.
作者
郝宪杰
孙卓文
赵毅鑫
杨科
张村
张谦
Hao Xianjie;Sun Zhuowen;Zhao Yixin;Yang Ke;Zhang Cun;Zhang Qian(Beijing Key Laboratory of Associated Energy Precision Mining,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 100083,China;School of Energy and Mining,China University of mining and Technology-Beijing,Beijing 100083,China;Anhui University of Science&Technology,Huainan Anhui 232000,China)
出处
《矿业科学学报》
CSCD
2021年第4期472-479,共8页
Journal of Mining Science and Technology
基金
国家自然科学基金(51804309)
中国矿业大学(北京)越琦青年学者(2019QN02)、杰出学者(2017JCB02)
内蒙古自治区科技重大专项(2019GG140)。
关键词
裂隙带
浅埋煤层
采动裂隙带
采高
围岩破坏度
fracture zone
shallow coal seam
mining caving zone
mining height
rock failure degree
作者简介
郝宪杰(1987—),男,山西孝义人,博士,副教授,主要从事地下工程稳定性的教学与研究工作。Tel:13521602708,E-mail:haoxianjie@cumtb.edu.cn。
