摘要
支架选型是应用顺槽超前液压支架支护技术的关键。以新巨龙矿井1302工作面沿空顺槽超前液压支架选型为工程背景,分析沿空面侧向岩层结构与首采面的差异及综放面沿空顺槽支架–围岩关系。基于力矩平衡关系,建立确定沿空顺槽超前支护强度的力学模型,提出以岩层回转角为控制对象的观点;采用基本顶位态方程对沿空顺槽围岩变形进行预计,运用弹性力学理论计算煤柱及沿空顺槽实体帮的承载力,并以不发生"挤架"为原则,推导出基本顶的临界回转角为2.7°,沿空顺槽超前支护的临界强度为0.50 MPa,从而选择型号为ZTC30000/25/50的液压支架。最后,应用沿空顺槽表面位移观测结果,验证所选支架的合理性。研究结果对沿空顺槽超前支护强度的确定及支架选型具有参考意义。
Support selection is the key to application of advanced support technology with hydraulic support in gateways of coal face.Taking the selection of advanced hydraulic support in gob-side entry of working face 1302 in Xinjulong Mine as engineering background,the difference between the side strata structure of gob-side face and that of primary face is discussed;and the relationship between support and surrounding rock in gob-side entry of fully mechanized caving face is studied.Based on the moment equilibrium relations,mechanical model for determination of advance support strength in gob-side entry is established;and the viewpoint that strata rotary angle is the control object is proposed.Prediction of surrounding rock deformation of the gob-side entry is constructed by using displacement state equation of basic roof.Bearing capacities of coal pillar and solid side of the gob-side entry are calculated using the elastic mechanical theory.With the principle of squeeze nonoccurrence,the conclusions that the critical rotary angle of basic roof is 2.7°and the critical strength of advance support in the gob-side entry is 0.50 MPa are obtained.The advanced hydraulic support of ZTC30000/25/50 type is selected according to the results.Finally,the reasonableness of the support is verified by using observation result of surface displacement of the gob-side entry.The results can provide a reference for determination of reasonable strength of advanced support and support selection.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第11期2232-2239,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226803)
国家自然科学基金资助项目(51274022
51174016)
关键词
采矿工程
综放面
沿空顺槽
超前液压支架
选型
变形预计
mining engineering
fully mechanized caving face
gob-side entry
advanced hydraulic support
selection
deformation prediction
