约束混凝土支顶护帮柱力学性能试验研究与应用  

Experimental study and application on mechanical properties of confined concrete column for roof and gangue rib support

作　　者：杨军[1,2] 李长江 辛忠欣[3] 王鸣子 李东浩 刘宇轩 李鲁宁 YANG Jun;LI Changjang;XIN Zhongxin;WANG Mingzi;LI Donghao;LIU Yuxuan;LI Luning(State Key Laboratory of Tunnel Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan,Shandong 250061,China)

机构地区：[1]中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《采矿与安全工程学报》2024年第6期1158-1169,共12页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52074298)。

摘　　要：针对无煤柱自成巷中,切顶护帮支架作为控制顶板变形、保证碎石帮稳定的关键手段,存在造价成本高、数量较少、只能作为临时支护接续使用的问题,提出以圆钢管轻骨料约束混凝土支顶护帮柱(CCLC)替换切顶护帮支架的支护技术。开展CCLC与现场常用支护结构U29型钢的偏压力学性能对比试验,结合数值计算方法,研究不同截面参数和材料强度对CCLC力学性能的影响。结果表明:在相同含钢量的情况下,CCLC试件的极限承载力为U29型钢试件的1.95~2.25倍,初始刚度为U29型钢试件的1.34~1.77倍;在不同钢管壁厚、钢管外径、混凝土强度和钢材强度方案中,CCLC极限承载力增长率分别为29%~106%,173%~954%,4%~14%,15%~28%,钢管外径对CCLC的极限承载力的影响更为显著。基于上述研究成果,综合考虑性价比及现场施工情况对CCLC进行选型设计,并在工程现场应用约束混凝土支护技术,取得良好的应用效果。As a primary means to control the deformation of roof and ensure the stability of gangue rib in non-pillar mining with automatically formed roadway,roof and gangue rib control equipment has the problems of high cost,small quantity,and suitability only for temporary support.Therefore,the support technology of circular confined lightweight concrete column for roof and gangue rib support(CCLC)is proposed as an alternative to the roof and gangue rib control equipment.A comparative test was conducted on the mechanical properties of CCLC and U29 steel under eccentric compression.Combined with numerical calculation methods,the effects of different section parameters and material strength on the mechanical properties of CCLC were studied.The results show that under the same steel content,the ultimate bearing capacity of CCLC is 1.95-2.25 times than that of U29 steel,with an initial stiffness 1.34-1.77 times higher.For different thickness of the steel tube,diameters of the steel tube,concrete strength,and steel strength schemes,the growth rates of the ultimate bearing capacity of CCLC are 29%-106%,173%-954%,4%-14%,and 15%-28%,respectively.Particularly,the diameter of the steel tube has a significant influence on the ultimate load-bearing capacity of CCLC.Based on the above research results,considering the cost performance and on-site construction conditions,CCLC was selected and designed,and the confined concrete support technology has been applied in the project site,and good application results have been achieved.

关 键 词：无煤柱自成巷 支顶护帮柱 轻骨料约束混凝土 力学性能 工程应用 

分 类 号：TD353[矿业工程—矿井建设]