中北大学学报（自然科学版）2019，Vol.40Issue(3)：193-197,205,6.DOI:10.3969/j.issn.1673-3193.2019.03.001
基于双线性软化模型鲁灰花岗岩断裂特征研究
Fracture Characteristics of Lu Gray Granite Based on Bilinear Softening Model
摘要
Abstract
To provide an insight into the nonlinear mechanical characteristics of rock fracture process, the bilinear softening model of brittle materials was applied in the research on fracture characteristics of Lu gray granite.Four parameters of σt, Gf, and w1 were calculated through the experiments, and the softening curves of Lu gray granite were established.The comparison between the critical crack tip opening displacement (CTODc) under peak load and wq verified the rationality of the softening model.The curve reflects the relationship between the cohesive stress and crack opening displacement during the fracture process of Lu gray granite.On the softening curve, the x-axis wq of the inflection point ranges between 0.006and 0.009mm, which corresponds to the critical state of instability failure;the critical crack opening displacement wcis between 0.05and 0.07 mm, corresponding to the end of the micro crack zone.关键词
软化曲线/断裂过程区/临界裂缝尖端张开位移/花岗岩Key words
softening curve/fracture process zone/critical crack tip opening displacement/granite分类
军事科技引用本文复制引用
林建伟,高经武,武晋文,王学怀,吕琪..基于双线性软化模型鲁灰花岗岩断裂特征研究[J].中北大学学报（自然科学版）,2019,40(3):193-197,205,6.基金项目
国家自然科学基金青年基金资助项目(51504220) （51504220）
