顶升可缩式钢管混凝土支柱试验研究与工程应用  

Experimental study and engineering application of jackingretractable concrete-filled steel tubular column

作　　者：王军[1,2] 杨光[1] 黄万朋 张涛 邢鲁义 WANG Jun;YANG Guang;HUANG Wanpeng;ZHANG Tao;XING Luyi(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Ministry of Education,Jinan 250101,China;College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Luxi Coal Mine in Linyi Mining Group,Jining 273512,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]山东科技大学矿业与安全工程学院,山东青岛266590 [4]临矿集团鲁西煤矿,山东济宁273512

出　　处：《煤炭学报》2022年第8期3052-3068,共17页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(51704176);山东省博士后创新资助项目(202003080);山东省高等学校土木结构防灾减灾协同创新中心资助项目(XTP201923)。

摘　　要：针对沿空留巷巷旁支护存在的问题,提出基于顶升可缩式钢管混凝土支柱的巷旁支护技术。设计了顶升可缩式钢管混凝土支柱结构与留巷工艺,为验证该支柱增阻让压性能,开展了不同让压结构的可缩承载试验,研究表明:杨木可缩阶段承载力200 kN、极值承载力700 kN,松木可缩阶段承载力500 kN、极值承载力900 kN,钢筋网柱可缩阶段承载力400 kN、极值承载力750 kN,以松木的压缩率最高,达到77.7%,可见,松木更适合作为让压结构。通过分析钢管混凝土短柱和长柱承载力试验结果,验证了钢管混凝土支柱高承载力特征,修正了支柱承载力长细比折减系数,优化了顶升可缩式钢管混凝土支柱承载力计算公式。通过文献分析选取了合理的巷旁支护阻力和压缩量计算方法,以鲁西煤矿3_(下)A02工作面沿空留巷为例,进行了巷旁支护阻力和压缩量计算分析,以试验研究为基础,开展了顶升可缩式钢管混凝土支柱结构设计、支柱受力分析和工程实践研究。实践表明采用单排φ299 mm×10 mm顶升可缩式钢管混凝土支柱+一排φ21.6 mm×10300 mm控顶锚索的巷旁支护,辅以挡风帘+网喷层的采空区隔离方案,能够保证沿空留巷长期稳定,该技术具有顶升初撑效果好、增阻变形能力强、支护承载力高等特点,在基本顶沉降运动剧烈的留巷工程中具有较好的应用前景,若进一步配合采空区侧切顶卸压和支柱外壳钢管回收复用,留巷效果将更优。To overcome the issue that exists in gob-side entry retaining,a gob-side entry retaining technology based on jacking retractable concrete-filled steel tubular column was proposed.A new jacking retractable concrete-filled steel tubular column structure and roadway retaining technology was developed.In order to verify the resistance increase and pressure-relief performance of the column designed,the compressible bearing tests of different pressure relief structures were carried out.The results show that the stable bearing capacity of poplar in the shrinkable stage is 200 kN and the extreme bearing capacity is 700 kN.The stable bearing capacity of reinforced mesh column in the shrinkable stage is 400 kN and the extreme bearing capacity is 750 kN.Correspondingly,the stable bearing capacity of pine in the shrinkable stage is 500 kN and the extreme bearing capacity is 900 kN,the compression rate of pine is the highest,reaching 77.7%,indicating that pine is more suitable as pressure-relief structure.Through the analysis of the bearing capacity test of the long and short columns,the high bearing capacity characteristics of jacking columns were verified,the reduction factor of slenderness ratio of the column bearing capacity was modified,and the calculation formula for the ultimate bearing capacity of the columns in compression stage and stability stage was obtained.By summarizing and analyzing various calculation methods,the calculation formulas of roadway side support resistance and reasonable compression in line with the technology of jacking retractable concrete-filled steel tubular column were given.According to the project background in the retaining roadway along the goaf at the A02 working face in the 3rd lower section of Luxi Coal Mine,the resistance and compression of roadway side support were analyzed.Then,on the basis of the experiment,the bearing capacity and force analysis of the retaining roadway were carried out according to the pillar structure design.The results of engineering practice show that the supp

关 键 词：钢管混凝土支柱 顶升接顶 木结构可缩性 沿空留巷 长短柱承载力 

分 类 号：TD353[矿业工程—矿井建设]