摘要
在地震作用下,坝体接缝灌浆面是一个相对薄弱面,在这个面很有可能出现Ⅱ型断裂破坏.采用有限宽两端预留缝半边受力试件进行了接缝灌浆材料的Ⅱ型断裂试验,在试验中考察了Ⅱ型断裂过程中的导电特性.试验结果表明,接缝灌浆材料试件的导电性能随荷载有显著的变化;接缝灌浆材料的导电特性可以被用来确定Ⅱ型起裂的临界荷载;Ⅱ型起裂时间与受压柱体内部裂缝出现的时间因试件不同而先后顺序有变化.
Under seismic action, the interface of joint-grouting in a dam is a weakening interface. And the fracture occurring in this interface could be in mode Ⅱ manner. Experiments for mode Ⅱ fracture of joint-grouting material on double-edge notched specimen were carried out. The electric properties of crack propagation, especially crack occurring, during mode Ⅱ fracture on double edge notched specimens of concrete were experimentally investigated. The experimental study has proven that the resistance during the crack propagation increases with the increase of load; electric properties of joint-grouting material can be used to ascertain critical load of double-edge specimen in mode Ⅱ fracture. The critical mode Ⅱ shear crack appears sometimes prior to the compressive failure in the loaded part of the specimens, and sometimes appears after the compressive failure in the loaded part.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2008年第4期546-550,共5页
Journal of Dalian University of Technology
关键词
材料试验
混凝土坝接缝灌浆
临界荷载
试验研究
导电性能
material testing
joint-grouting in concrete dam
critical load
experimental study
electric property
