张开度影响的裂隙体破断机制探讨

蒲成志; 杨仕教; 张春阳

doi:10.11779/CJGE201910007

张开度影响的裂隙体破断机制探讨 English Version

1. 南华大学资源环境与安全工程学院,湖南衡阳 421001; 武汉理工大学资源与环境工程学院,湖北武汉 430070

基金项目: 国家自然科学基金青年基金项目（51704168,51404179）; 中国博士后科学基金项目（2016M602417）

详细信息

作者简介:
蒲成志(1986—),男,博士,副教授,主要从事岩石断裂力学方面的试验与理论研究工作。E-mail：puchengzhi@foxmail.com。

通讯作者:
张春阳，E-mail：zcl2722@163.com

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出版历程
- 收稿日期: 2018-12-03
- 发布日期: 2019-10-24

Fracture mechanism of pre-cracked specimens influenced by opening width

1. School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China;
2. School of Resources and Environment Engineering, Wuhan University of Technology, Wuhan 430070, China

摘要

摘要: 预制裂隙闭合形态是影响裂隙体模型破坏模式及破断机制的重要因素。为了系统探索裂隙闭合形态对裂隙体试件破断机理的影响,基于插片法用水泥砂浆材料制备了具有4种不同张开度的裂隙体试件,在RMT-150B试验机上开展了单轴加载试验,发现：裂隙体张开度为0.1 mm时,不同倾角裂隙体峰值强度变化规律与滑动裂纹模型理论（μ=0）揭示规律相吻合;张开度为0.2,0.4,0.8 mm时,不同倾角裂隙体峰值强度变化规律与滑动裂纹模型理论预测规律不一致。为探索压缩条件下张开裂隙模型的破断力学机制,基于弹性力学椭圆孔渐进应力场环境,结合应力叠加原理,分析了渐进应力场中法向压应力和横向压应力对孔口应力集中现象的贡献,给出了任意倾角椭圆型裂纹孔口环向集中应力的表达式,然后对试验过程中水平展布预制裂隙微裂纹发育特征与破断屈服过程的力学机理进行了分析和讨论;并基于线弹性断裂力学理论,讨论了渐进应力场中剪应力对尖端微裂纹发育的力学作用机理。
- 裂隙体 /
- 闭合型裂纹 /
- 张开型裂纹 /
- 张开度 /
- 渐进应力场
Abstract: The closed form of pre-crack specimens is an important factor affecting their failure mode and breaking mechanism. In order to systematically explore the influence of the form of crack closure on the fracture mechanism of fracture specimens, four kinds of pre-cracked specimens with different opening widths are made of concrete by inserting thin slices, then the uniaxial compression tests are carried out using the RMT-150B tester after the curing process. The results show that the variation of the peak strength of pre-cracked specimens with different dip angles is consistent with the theory of sliding crack model when the friction coefficient (μ) of crack surfaces is zero and the opening width is 0.1 mm except 0.2, 0.4 and 0.8 mm. In order to explore the breaking mechanism of the specimens with an opened crack under compression, the contribution of normal and transverse compressive stresses to the stress concentration on the crack faces is analyzed based on the superposition principle and progressive field of stress in the region of the elliptic hole, and the formula for the circumferential concentrated stress of an elliptical crack with an arbitrary inclination angle is proposed. In addition, the development characteristics of micro-cracks and the breaking mechanism of pre-cracked specimens during the failure process are also analyzed and discussed. Finally, based on the theory of linear elastic fracture mechanics, the mechanism of shear stress on the development of microcracks at the pre-cracked tip is discussed.
- pre-cracked specimen /
- closed crack /
- opened crack /
- opening width /
- progressive stress field

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