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杨登峰,张拥军,徐文协,等. 大采高浅埋煤层工作面矿压显现特征模拟及试验分析[J]. 科学技术与工程, 2020, 20(20): 8099-8106.
Yang Dengfeng,ZHANG Yongjun,徐文协,et al.Analysis of the Appearance Characteristics of Mineral Pressure in the Shallow Seam[J].Science Technology and Engineering,2020,20(20):8099-8106.
大采高浅埋煤层工作面矿压显现特征模拟及试验分析
Analysis of the Appearance Characteristics of Mineral Pressure in the Shallow Seam
投稿时间:2019-09-11  修订日期:2020-04-25
DOI:
中文关键词:  浅埋煤层  大采高  UDEC  切顶  顶板来压
英文关键词:Shallow buried coal seam  high strength mining  UDEC  roof cutting  roof pressure
基金项目:国家自然科学基金资助项目(51704173,51674151),山东省重点研发计划项目(2019GSF111029),山东省高等学校科技计划项目(J17KA203),青岛市博士后研究人员应用研究项目;
              
作者单位
杨登峰 青岛理工大学 理学院
张拥军 青岛理工大学 土木工程学院
徐文协 青岛理工大学 土木工程学院
王观群 青岛理工大学 土木工程学院
高祥壮 青岛北洋建筑设计有限公司
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中文摘要:
      针对浅埋煤层在大采高条件下顶板运移规律及矿压显现特征,通过构建数值模型研究了3m~7m采高条件下的顶板破断过程及来压规律,并构建物理模型分析了顶板垮落及支架工作阻力变化特征。研究结果表明:随着采高的增大,顶板回转角度不断增大,且出现了明显的台阶下沉现象,采高从3m增大到7m地表沉降量增加了3.5m,顶板的初次来压及周期来压步距整体呈增大趋势;煤壁支承压力峰值随采高增大往工作面前方迁移,影响范围也不断增大,在采高5m时达到了最大值10.53MPa,之后回落并趋于稳定,证明支承压力值并非随采高增大而持续增大;随着采高的增大顶板卸荷损伤区域迅速向上扩展,使上覆岩层裂隙充分发育,诱发顶板的大范围切落,大采高形成了“悬臂梁-砌体梁”结构,形成了工作面的剧烈来压。物理模拟结果表明,切顶发生时支架工作阻力提升到了4180kN,较周期来压时增大了16.1%,比普通采高时有了较大的提升。因此,选取合理的采高对于保证采空区稳定减少顶板灾害事故至关重要。
英文摘要:
      Aiming at the movement law of roof under high mining height and the characteristics of pressure, the breaking process and compressive law of roof under high mining height of 3m ~ 7m are studied by constructing numerical model, and the physical model is constructed to analyze the change characteristics of roof collapse and support working resistance. The results show that: The surface settlement increases by 3.5 m at a height of 3m to 7m, and the initial pressure and cycle of the top plate.The peak pressure of the coal wall supports the migration to the front of the working surface with the increase of the mining height. At the height of 5m, the maximum value of 10.53 MPa is reached. The support pressure value does not increase with the increase of mining height. The crack of the upper overburden rock layer is fully developed, and the large area of the roof plate is cut down. The large height of the top plate forms the structure of the "cantileve-masonry beam" and forms the work surface.The working resistance of the scaffold increased to 4180 kN at the time of roof cutting, which was 16.1% higher than that at periodic pressure, and it was greatly improved at normal height. Therefore, selecting reasonable height is very important for ensuring the stability of the goaf area and reducing the top plate disaster.
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