不同加载速率下饱水高延性喷射混凝土的单轴压缩试验  

Experimental Study on Uniaxial Compression of Saturated High Ductility Shotcrete Under Different Loading Rates

作　　者：胡时 蔡海兵[1] 马祖桥 袁助 丁祖德[3] HU Shi;CAI Haibing;MA Zuqiao;YUAN Zhu;DING Zude(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽省交通控股集团有限公司,合肥230088 [3]昆明理工大学建筑工程学院,昆明650500

出　　处：《材料导报》2022年第8期102-111,共10页Materials Reports

基　　金：国家自然科学基金(51778004,52168057);安徽省2019年度高校学科(专业)拔尖人才学术资助项目(gxbjZD10);安徽省2021年高校研究生科学研究项目(YJS20210381);安徽理工大学研究生创新基金项目(2021CX1006);安徽省交通控股集团有限公司科技攻关项目(JKKJ-2018-31)。

摘　　要：为了准确评价在芜黄高速公路雾岭头特长隧道工程应用的新型高延性喷射混凝土(HDSC)的性能表现,利用现场施工条件,对其开展了坍落度、回弹率研究及饱水状态下五种加载速率的单轴压缩试验,并结合扫描电镜、X射线衍射和核磁共振试验详细研究了该混凝土的各项性能。结果表明:现场工程使用的HDSC坍落度为168 mm,回弹率为8%,其性能优异,满足工程要求;吸水量呈先快速增加再缓慢增加最后维持稳定的变化趋势;饱和水状态下,随着加载速率增加,HDSC的峰值应力、弹性模量和储能密度极限值均呈上升趋势,峰值应变却呈下降趋势,并且其对“应变率效应”敏感,其压缩破坏过程可看成裂而不散的延性破坏。In order to accurately evaluate the performance of a new high ductility shotcrete(HDSC)applied in super-long tunnel project of Wuhuang expressway,the tests of slump,rebound rate and the uniaxial compression tests of five loading rates under saturated water condition were carried out by using field construction conditions,and the properties were studied by combining the scanning electron microscopy,x-ray diffraction and nuclear magnetic resonance test.The results show that the slump of HDSC used in the field engineering is 168 mm,and the rebound rate is 8%,and its performance is excellent,which meets the engineering requirements.The water absorption increased rapidly at first,then slowly,and finally maintained a stable trend.Under saturated water condition,with the increase of loading rate,the peak stress,elastic modulus and energy sto-rage density limit of HDSC all show an upward trend,while the peak strain shows a downward trend,and is sensitive to the“strain rate effect”.Its compression failure process can be regarded as a ductile failure with cracks but no dispersion.

关 键 词：高延性喷射混凝土 混杂纤维 机制砂 加载速率 储能密度极限 

分 类 号：U454[建筑科学—桥梁与隧道工程]