混凝土/花岗岩界面动态断裂性能的劈拉试验研究  

Split-tension Tests for Dynamic Fracture Behavior of Concrete/granite Interface

作　　者：钟红 马振洲[2,3] 范向前 胡少伟[4] ZHONG Hong;MA Zhenzhou;FAN Xiangqian;HU Shaowei(China Institute of Water Resources and Hydropower Research,State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100048,China;Bohai Hebei Investment Group Co.Ltd,Cangzhou 061113,China;Dalian University of Tech no logy,State Key Laboratory of Coastal and Offshore Engineering,Dalian 116024,China;Nanjing Hydraulic Research Institute,Nanjing 210024,China)

机构地区：[1]中国水利水电科学研究院,流域水循环模拟与调控国家重点实验室,北京市100048 [2]河北渤海投资集团有限公司,河北省沧州市061113 [3]大连理工大学,海岸和近海工程国家重点实验室,辽宁省大连市116024 [4]南京水利科学研究院,江苏省南京市210024

出　　处：《水电与抽水蓄能》2019年第6期133-138,共6页Hydropower and Pumped Storage

基　　金：国家自然科学基金项目(51579033);中国水利水电科学研究院基本科研业务费专项项目(EB0145B112019);国家重点研发计划(2017YFC0404903;2016YFB0201000; 2016YFC0401600)

摘　　要：为研究应变率对混凝土/岩石界面断裂性能的影响,对带预制缝的混凝土/花岗岩立方体复合试件进行了劈拉试验,获得了在四种试验应变率时的荷载-裂缝开口位移曲线,并得到了峰值荷载和应变率之间的关系,以及分析了试件断裂性能的应变率效应机理;基于界面力学理论和结构动力响应分析获得了界面裂缝的动态应力强度因子。结果表明,劈拉试件在所研究的应变率范围内均沿混凝土和花岗岩的界面发生断裂,其峰值荷载随应变率的提高而增加,对试验应变率下材料动态断裂性能分析时可忽略惯性效应的影响。In order to study the effect of strain rate on the fracture properties of con crete/rock in terface,the split-te nsion tests were carried out on concrete/granite cubic composite specimens with central prefabricated cracks.The load-crack opening displacement curves at four strain rates were obtai ned,and the relation ship betwee n peak load and strain rate was obtained.At the same time,the rate effect mechanism of specimen fracture characteristic in the range of test strain rates was an alyzed.Based on the in terface mechanics theory and the structural dynamic equation,the dynamic stress density factor of interface crack is obtained.It was found that the split-tension specimens fractured along the in terface between con crete and granite at each strain rate.The peak load increased with the in crease of strain rate,and the influence of inertial effect on the dynamic fracture properties of the materials under the test strain rates could be neglected.

关 键 词：劈拉试验 界面断裂 应变率效应 峰值荷载 动态应力强度因子 

分 类 号：TV431[水利工程—水工结构工程]