期刊论文

Fracture test and analysis of horizontal fissure rock-like specimens influenced by apertures

Pu, Cheng-Zhi(puchengzhi@foxmail.com)

中文

岩土工程学报

1000-4548

2020

42

3

523-532

10.11779/CJGE202003014

51704168:国家自然科学基金 51774187:国家自然科学基金 2016M602417:中国博士后科学基金 CX2017B519:湖南省研究生科研创新项目

本校为第一且通讯机构

为探究张开度影响的水平裂隙岩体破断机理,利用水泥砂浆制备不同张开度水平单裂隙类岩体试件,基于RMT-150B岩石力学试验机对制备的类岩体试件进行单轴加载试验。结果表明:同一预制裂隙长度下,随着裂隙张开度的减小,微裂纹萌生位置由预制裂隙中部向尖端转移。为验证此现象,基于PFC数值仿真平台的平行黏结接触单元构建了裂隙体数值模型进行分析,在数值计算边界条件与试验测试环境相一致的条件下,得到了与试验测试结果相一致的微裂纹起裂模式与破断特征。为进一步探究水平裂隙岩体微裂纹起裂扩展机制,结合微裂纹起裂扩展过程中数值模型颗粒位移场演化规律,基于裂纹面变形屈服特征,提出了固支梁简化...

In order to explore the fracture mechanism of horizontal fissure rock mass with different apertures, single-fissure rock mass specimens with different apertures are prepared by using cement mortar. The uniaxial loading tests are carried out on the prepared rock mass specimens based on the RMT-150B rock mechanics testing machine. The results show that under the same length of prefabricated fissure, with the decrease of fissure apertures, the initiation position of microcracks shifts from the middle of prefabricated fissure to the tip. To verify ...