摘要
为探究压剪断裂破坏下准脆性材料开闭合裂缝对裂缝起裂的影响,采用尺寸为150 mm的闭合裂缝与非闭合裂缝立方体石膏试样,开展压剪断裂试验。研究了裂缝倾角和裂缝形态对试样抗压强度、破坏模式和起裂角的影响规律,揭示了准脆性材料不同裂缝形态下的压剪张拉断裂特征。同时基于考虑T应力的压剪张拉起裂准则,预测了不同形态裂缝试样的起裂角,并与传统理论预测曲线和试验结果对比分析,发现考虑T应力后的压剪张拉起裂准则预测结果更加准确。并引入相对临界尺寸α,通过两种不同裂缝形态试样互相对比,得出本文准脆性材料临界尺寸α为0.1,验证了准则的适用性。最后阐释了两种裂缝类型下,不同预制裂缝倾角对起裂角的规律和闭合裂缝与非闭合裂缝的差异化断裂行为。
In order to investigate the effect of opening and closing cracks of quasi-brittle materials on crack initiation under compressive-shear fracture failure,the press-shear fracture tests were carried out on the cubic gypsum samples with closed cracks and open cracks with a size of 150mm,and the effects of crack inclination angle and fracture morphology on the compressive strength,failure mode and crack initiation angle of the samples were studied.The pressure-shear tension-tensile fracture characteristics of quasi-brittle materials with different fracture morphologies are revealed.At the same time,based on the pressure-shear tensile cracking criterion considering T stress,the initiation angle of different fracture samples is predicted,and compared with the traditional theoretical prediction curve and the test results.It is found that the pressure-shear tensile cracking criterion considering T stress has more accurate prediction results.Moreover,the relative critical sizeαis introduced,and the critical sizeαof the quasi-brittle material in this paper is 0.1 through the comparison of the samples with two different fracture forms,which verifes the applicability of the criterion.Finally,the law of the dip angle of prefabricated fractures on the initiation angle and the differential fracture behavior of closed and open cracks under the two fracture types are explained.
作者
张雄辉
黄孝福
黄诗渊
刘发贵
聂亮冰
黎子玄
ZHANG Xiong-hui;HUANG Xiao-fu;HUANG Shi-yuan;LIU Fa-gui;NIE Liang-bing;LI Zi-xuan(Guangzhou Salvage Bureau of the Ministry of Transp,Guangzhou 510000,Guangdong Province,China;College of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《中国农村水利水电》
北大核心
2025年第3期128-135,共8页
China Rural Water and Hydropower
基金
水利水运工程教育部重点实验室开放基金资助项目(SLK2021A07)
国家自然科学基金项目(52109113)
水利部堤防安全与病害防治工程技术研究中心开放课题基金资助项目(LSDP202101)。
关键词
准脆性材料
非闭合裂缝
闭合裂缝
裂缝倾角
起裂角
quasi-brittle material
open cracks
closed cracks
crack inclination angle
crack initiation angle
作者简介
张雄辉(1975-),男,主要从事水运工程设计、施工管理。E-mail:154997320@qq.com;通讯作者:黄诗渊(1991-),男,副教授,博士,主要从事岩土体断裂力学方面的研究。E-mail:cqjtdxhsy@163.com。
