| 引用本文: | 朱俊,邓建辉,黄弈茗,刘涛,马元军.大理岩特征应力的加载速率效应研究[J].哈尔滨工业大学学报,2020,52(2):75.DOI:10.11918/201811171 |
| ZHU Jun,DENG Jianhui,HUANG Yiming,LIU Tao,MA Yuanjun.Study of loading rate effect on characteristic stresses of marble[J].Journal of Harbin Institute of Technology,2020,52(2):75.DOI:10.11918/201811171 |
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| 大理岩特征应力的加载速率效应研究 |
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朱俊1,2,邓建辉1,2,黄弈茗1,2,刘涛3,马元军2
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(1.水力学与山区河流开发保护国家重点实验室(四川大学),成都 610065; 2.四川大学 水利水电学院, 成都 610065; 3.西北矿冶研究院,甘肃 白银 730900)
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| 摘要: |
| 为研究加载速率对脆性岩石特征应力的影响规律,利用MTS815型试验机和声发射测试系统进行大理岩的单轴压缩试验.采用体积应变法、声发射法和基于微裂纹发育特性的黏结颗粒离散元法确定试样的特征应力,探究特征应力的加载速率效应.结果表明,3种方法确定的特征应力值较为接近,基于微裂纹数的黏结颗粒离散元法是一种较可靠有效的方法.在中低加载速率范围内,随加载速率增加,归一化特征应力值呈现减小规律.数值模拟结果显示,加载速率在中低和较高范围内增加时,归一化起裂应力和损伤应力均减小.当处于中低加载速率范围时,其归一化特征应力降幅较大.当处于较高加载速率范围时,归一化特征应力趋于平稳,尤其是归一化损伤应力.相比较而言,归一化损伤应力的加载速率效应整体上比归一化起裂应力明显. |
| 关键词: 岩石力学 加载速率 特征应力 声发射 体积应变 PFC2D |
| DOI：10.11918/201811171 |
| 分类号:TU458 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(41772322)； 国家重点研发计划(2016YFC0600702) |
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| Study of loading rate effect on characteristic stresses of marble |
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ZHU Jun1,2,DENG Jianhui1,2,HUANG Yiming1,2,LIU Tao3,MA Yuanjun2
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(1.State Key Laboratory of Hydraulics and Mountain River Engineering(Sichuan University), Chengdu 610065, China; 2.College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China; 3.Northwest Institute of Mining and Metallurgy,Baiyin 730900, Gansu, China)
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| Abstract: |
| To study the effect of loading rate on the characteristic stresses of brittle rocks, uniaxial compression tests were carried out using MTS815 test machine and acoustic emission (AE) test system. The volume strain method, AE method, and bonded particle model (BPM) method based on the development of micro-cracks were adopted to determine the characteristic stresses of samples and investigate the loading rate effect of characteristic stresses for marble. Results show that values of the normalized characteristic stress determined by the three methods are relatively close, and the BPM method based on the numbers of micro-crack is a reliable and effective method. Moreover, the normalized characteristic stresses decrease as loading rates increase in the range of medium and low. Numerical simulation results show that when the loading rates increased in a wide range, the normalized crack initial stress and crack damage stress both decrease. When the loading rates are in medium and low range, the normalized characteristic stresses decrease significantly. However, it tend to be stable when the loading rates are high, especially for the normalized crack damage stress. In comparison, the loading rate effect of normalized crack damage stress is more obvious than that of the normalized crack initial stress. |
| Key words: rock mechanics loading rates characteristic stresses AE volumetric strain PFC2D |
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