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硬岩脆性指标与弹性应变能关系初探 预览

Preliminary study on relationship between brittleness index and elastic strain energy for hard rock
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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. 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, B14 are in power function relationship with the crack initiation elastic strain energy(single variable), and the brittleness indexes B15, B16 are 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, B16 and 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.
作者 张英 郭奇峰 蔡美峰 任奋华 ZHANG Ying;GUO Qifeng;CAI Meifeng;REN Fenhua(School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;Key Lab of High-Efficient Mining and Safety of Metal Mines (University of Science and Technology Beijing), Ministry of Education, Beijing 100083, China)
出处 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2019年第6期79-88,共10页 Journal of Harbin Institute of Technology
基金 国家重点研发计划(2017YFC0804101) 国家自然科学基金(51774022).
关键词 硬岩 脆性指标 弹性应变能 单轴压缩试验 函数关系 hard rock brittleness index elastic strain energy uniaxial compression test function relationship
作者简介 张英(1988-),男,博士研究生;通信作者:郭奇峰,guoqifeng@ustb.edu.cn;蔡美峰(1943-),男,博士生导师,中国工程院院士.
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