| 引用本文: | 张英,郭奇峰,蔡美峰,任奋华.硬岩脆性指标与弹性应变能关系初探[J].哈尔滨工业大学学报,2019,51(6):79.DOI:10.11918/j.issn.0367-6234.201809127 |
| ZHANG Ying,GUO Qifeng,CAI Meifeng,REN Fenhua.Preliminary study on relationship between brittleness index and elastic strain energy for hard rock[J].Journal of Harbin Institute of Technology,2019,51(6):79.DOI:10.11918/j.issn.0367-6234.201809127 |
|
| 摘要: |
| 为探讨硬岩脆性指标与弹性应变能之间的关系,采用侧向应变差法确定起裂应力,以岩石起裂应力和峰值强度为桥梁,基于断裂力学理论和能量理论解释了脆性指标与弹性应变能内在的联系,并从两种岩石单轴压缩试验中构建了脆性指标与弹性应变能之间的函数关系.结果表明:脆性指标B13、B14与起裂弹性应变能（单变量）符合幂函数关系,脆性指标B15、B16与起裂弹性应变能（单变量）符合幂函数或线性函数关系,脆性指标B13、B14、B15和B16与峰值弹性应变能（单变量）之间无明显函数关系；新定义的脆性指标可由起裂和峰值弹性应变能（双变量）获得,或由起裂弹性应变能（单变量）获得,脆性指标与峰值弹性应变能关系式的构建,对于研究岩爆倾向性具有重要意义；根据新定义的脆性指标,利用两种岩石算例验证表明,采用起裂弹性应变能的岩石脆性指标计算方法具有一定的可靠性.通过这一研究,为岩石脆性指标与起裂弹性应变能关系的确定提供了一种新方法. |
| 关键词: 硬岩 脆性指标 弹性应变能 单轴压缩试验 函数关系 |
| DOI：10.11918/j.issn.0367-6234.201809127 |
| 分类号:TU45 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2017YFC0804101)；国家自然科学基金(51774022) |
|
| Preliminary study on relationship between brittleness index and elastic strain energy for hard rock |
|
ZHANG Ying1,2,GUO Qifeng1,2,CAI Meifeng1,2,REN Fenhua1,2
|
|
(1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2.Key Lab of High- Efficient Mining and Safety of Metal Mines (University of Science and Technology Beijing), Ministry of Education, Beijing 100083, China)
|
| Abstract: |
| To study the relationship between brittleness index and elastic strain energy, the lateral strain response method was used to determine the crack initiation stress of hard rock. By using the crack initiation stress and peak stress of rock, the relationship between brittleness index and elastic strain energy was explained based on fracture mechanics theory and energy theory, and a functional relationships were constructed between brittleness index and elastic strain energy from uniaxial compression test for two types of rock. Results show that the brittleness indexes B13, B14are in power function relationship with the crack initiation elastic strain energy (single variable), and the brittleness indexes B15, B16are in power or linear function relationships with the crack initiation elastic strain energy (single variable). However, no apparent functional relationship was discovered between the brittleness indexes B13, B14, B15, B16and the peak elastic strain energy (single variable). The new brittleness index could be either obtained from both the crack initiation strain energy and the peak elastic strain energy (two variables), or the crack initiation elastic strain energy (single variable). The relationship between brittleness index and the peak elastic strain energy is of great significance for studying rock burst proneness. The calculation method for brittleness index was redefined. Besides, the verifications of two examples show that this method, using the crack initiation elastic strain energy, demonstrates certain credibility. This study provides a new method determining the relationship between brittleness index and the crack initiation elastic strain energy of rock. |
| Key words: hard rock brittleness index elastic strain energy uniaxial compression test function relationship |
