基于楔入劈拉测试方法的全级配大坝混凝土裂缝扩展试验研究  

Experimental study on crack propagation of fully-graded dam concrete based on wedge splitting test method

作　　者：卜静武 田硕 孙浩文 吴新宇 卢建琴 BU Jingwu;TIAN Shuo;SUN Haowen;WU Xinyu;LU Jianqin(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China;Yangzhou Survey Design Research Institute Co.,Ltd.,Yangzhou 225007,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]扬州市勘测设计研究院有限公司,江苏扬州225007

出　　处：《混凝土》2022年第9期169-173,178,共6页Concrete

基　　金：国家自然科学基金项目(51809227);水文水资源与水利工程科学国家重点实验室面上项目(2017491711)。

摘　　要：为了研究全级配大坝混凝土裂缝扩展机理,针对3组不同缝高比的全级配大坝混凝土带缺口立方体试件开展了楔入劈拉试验,同时采用数字图像相关方法测量试件表面位移。结果表明:峰值荷载随着初始缝高比的增大而减小。虚拟裂缝长度在裂缝尖端位移达到临界值时达到最大,且随着初始缝高比的增大而减小。宏观裂缝扩展速度和有效裂缝长度随着初始缝高比的增大而减小。有效裂缝长度随着骨料粒径增加而增加,且增长倍数随骨料粒径和试件有效高度的增大而增大。In order to study the crack propagation of the fully-graded dam concrete,wedge splitting tests are performed on cubic specimens with three different initial notch to depth ratios.Meanwhile,the digital image correlation method is used to measure the full field displacement of the specimen.The test results show that the peak load increases with the increase of the initial notch to depth ratio.When the critical crack tip opening displacement reaches to the critical value,the length of fictitious crack reaches to the maximum value and decreases with the increase of the initial notch to depth ratio.The propagation velocity of macro crack and effective crack length decrease with the increase of the initial notch to depth ratio.The length of effective crack was found increased with the maximum aggregate size,and the growth time increased with the maximum aggregate size and the effective height of specimen.

关 键 词：全级配大坝混凝土 楔入劈拉试验 缝高比 数字图像相关方法 裂缝张开位移 有效裂缝 

分 类 号：TU528.07[建筑科学—建筑技术科学]