摘要
针对众多地区采场覆岩存在厚硬岩层,破断岩块块度较大,导致破断步距计算公式结果失真的问题,考虑岩块间相互作用力及支护参数等多重因素,结合材料力学中的组合变形,建立了厚硬岩层周期破断步距力学模型,得出了周期破断步距计算公式,通过现场实测数据对所推导公式进行了实证,并与传统悬臂式破断步距计算公式进行对比。研究结果表明:随岩层厚度的增大,传统计算公式结果偏离实际值愈发明显,而推导的步距计算公式则可与实际较好吻合,具有较高的可靠性和合理性。
As the stope overburden in some districts has thick and hard rock formation,the blockness of broken rock mass is big,resulting in distortion of breaking span calculation formula.Considering various factors such as interaction of the rocks and the support parameters,using combined deformation in material mechanics,the thick and hard rock formation periodical fracture interval mechanical model is established,and the periodical fracture interval calculation formula is obtained,the derivation formula is proved by the on-site measurement data and compared with the traditional boom-type calculation formula.The research result shows that as the rock formation thickness increases,the result of traditional calculation formula increasingly deviates from the actual value,while the result of the derived formula coincides well with the actual value.
作者
刘一扬
宋选民
王仲伦
LIU Yi-yang;SONG Xuan-min;WANG Zhong-lun(MOE Key Laboratory of In-situ Property-improving Mining,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭工程》
北大核心
2020年第7期106-111,共6页
Coal Engineering
基金
中国矿业大学煤炭资源与安全开采国家重点实验室开放课题资助项目(SKLCRSM19KF019)
山西省教育厅高等学校科技创新项目(2019L0183)。
关键词
厚硬岩层
周期破断步距
接触面作用力
组合变形
支护参数
thick and hard rock
periodic fracture interval
interface force
combined deformation
support parameter