掺合料对钢管混凝土柱承载性能的影响
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摘要
为提高巷道底角大直径钻孔钢管混凝土联排桩基的稳定性,研究了混凝土中掺入掺合料超细粉煤灰、硅粉和钢纤维对钢管混凝土柱承载性能的影响。采用正交试验方法,对评价指标进行极差分析、方差分析和综合分析,并选出了掺合料的最优组合。结果表明:超细粉煤灰、硅粉和钢纤维三者组合能提高核心混凝土强度,当超细粉煤灰、硅粉和钢纤维掺量分别为20%、10%和1%时,核心混凝土强度最高。通过对钢管混凝土柱进行ANSYS数值模拟,验证了掺入掺合料后的钢管混凝土柱承载性能有较大提高。
In order to improve stabilities of concrete-filled steel tube( CFST) pile of large diameter drill-hole in bottom corner of the roadway,the influences of admixture superfine fly ash,silica fume and steel fiber on the bearing capacity of concrete-filled steel tubular columns were studied. Orthogonal test combined with range analysis,variance analysis and comprehensive analysis was carried out to determine optimal combination of admixtures. The results showed that three combinations( i. e. ultra-fine fly ash,silica fume and steel fiber) could improve the strength of core concrete. The strength of core concrete reached maximum value when content of ultra-fine fly ash,silica fume and steel fiber was 20%,10% and 1% respectively. ANSYS simulation of CFST columns verified that the bearing capacity of concrete-filled steel tubular columns with admixtures was significantly improved.
In order to improve stabilities of concrete-filled steel tube( CFST) pile of large diameter drill-hole in bottom corner of the roadway,the influences of admixture superfine fly ash,silica fume and steel fiber on the bearing capacity of concrete-filled steel tubular columns were studied. Orthogonal test combined with range analysis,variance analysis and comprehensive analysis was carried out to determine optimal combination of admixtures. The results showed that three combinations( i. e. ultra-fine fly ash,silica fume and steel fiber) could improve the strength of core concrete. The strength of core concrete reached maximum value when content of ultra-fine fly ash,silica fume and steel fiber was 20%,10% and 1% respectively. ANSYS simulation of CFST columns verified that the bearing capacity of concrete-filled steel tubular columns with admixtures was significantly improved.
引文
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[2]何满潮.深部煤矿灾害机理及监测研究进展[J].煤炭科技,2007(1):1-5.HE M C. Research progress on disaster mechanism and monitoring of deep coal mine[J]. Coal science and technology,2007(1):1-5.
[3]姜耀东,潘一山,姜福兴,等.我国煤炭开采中的冲击地压机理和防治[J].煤炭学报,2014,39(2):205-213.JIANG Y D,PAN Y S,JIANG F X,et al. The mechanism and prevention of rock burst in coal mining in China[J]. Journal of China Coal Societ,2014,39(2):205-213.
[4]郭金刚,王伟光,杨增强,等.工作面端头L形区煤柱体诱发冲击机理及防治研究[J].矿业科学学报,2017(1):153-160.GUO J G,WANG W G,YANG Z Q,et al. Study on the mechanism and prevention of L zone coal Pillar induced shock in working face[J]. Journal of Mining Science,2017(1):153-160.
[5]汤关祚,招炳泉,竺惠仙,等.钢管混凝土基本力学性能的研究[J].建筑结构学报,1982,3(1):13-31.TANG G Z,ZHAO B Q,ZHU H X,et al. Study on the basic mechanical properties of concrete-filled steel tube[J]. Journal of Building Structures,1982,3(1):13-31.
[6] KANEKO T,TAMAI T,ISHIKAWA Y,et al. On the strength development and time for formwork to remain in place of concrete effected with types of cements[J].Journal of Structural&Construction Engineering,2009,74:1195-1203.
[7]邱庆利.聚丙烯纤维和硅粉对隧道衬砌混凝土抗渗阻裂性能的影响[D].杭州:浙江大学,2016.QIU Q L. Effect of polypropylene fiber and silica fume on permeability and crack resistance of tunnel lining concrete[D]. Hangzhou:Zhejiang University,2016.
[8] SAHA MK,TAN KH. Ten-year study on steel fiber-reinforced concrete beams under sustained loads[J]. Aci Structural Journal,2005,102(3):472-480.
[9]中华人民共和国建设部.普通混凝土力学性能试验方法标准:GB/T50081—2002[S].北京:中国建筑工业出版社,2003.MINISTRY OF CONSTRUCTION OF THE PEOPLE'S REPUBLIC OF CHINA. Standard test method for mechanical properties of ordinary concrete:GB/T50081—2002[S]. Beijing:China Construction Industry Press,2003.
[10]丁威,冷发光,韦庆东,等.《普通混凝土配合比设计规程》(JGJ55—2011)简介[J].混凝土世界,2011(12):76-79.DING W,LENG F G,WEI Q D,et al. Brief introduction of“Specification for design of common concrete mix”(JGJ55—2011)[J]. China Concrete,2011(12):76-79.
[11]杜勇刚,刘海峰,马荷姣,等.沙漠砂混凝土抗压和抗折强度试验研究[J].混凝土,2018(1):102-104.DU Y G,LIU H F,MA H J,et al. Experimental study on compressive strength and flexural strength of desert sand concrete[J]. Concrete,2018(1):102-104.
[12]于蕾,张君,张国庆,等.纤维复合泡沫混凝土力学性能优化[J].混凝土,2017(1):145-149.YU L,ZHANG J,ZHANG G Q,et al. Optimization of mechanical properties of fiber composite foam concrete[J]. Concrete,2017(1):145-149.
[13]万宁.方钢管混凝土受压短柱力学性能的分析[D].成都:西南交通大学,2012.WAN N. Analysis of mechanical behavior of concretefilled square steel tubular stub columns under compression[D]. Chengdu:Southwest Jiaotong University,2012.
[14]付小超.薄壁钢管混凝土柱轴心受压性能的研究[D].南昌:南昌大学,2008.FU X C. Study on axial compression behavior of concrete filled thin-walled steel tubular columns[D]. Nanchang:Nanchang University,2008.