Experimental research on the influence of loading rate on the mechanical properties of limestone in a high-temperature state
Experimental research on the influence of loading rate on the mechanical properties of limestone in a high-temperature state
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高温状态下加载速率对石灰石力学性能影响的试验研究
DOI：
10.1007/s10064-018-1332-4
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发表时间：
2018-07
影响因子：
4.2
通讯作者：
Chen Yan-long
中科院分区：
文献类型：
--
作者：
Meng Qing-bin;Zhang Ming-wei;Han Li-jun;Pu Hai;Chen Yan-long
与高温岩石有关的工程问题，如高放射性核废料的深埋处理、煤炭地下气化和储存、地热资源的开发、重要建筑物火灾后的修复等，已引起许多工程师的兴趣，成为岩石力学的一个新兴领域。在我们的研究中，我们进行了单轴压缩试验条件下的高温（T），范围从20 °C到800 °C和加载速率（lr），从0.001到0.1 mm/s，使用MTS 816岩石力学测试系统，目的是研究变形和强度参数的石灰岩的演变。结果表明，不同温度和加载速率下石灰岩的单轴压缩过程包括压实、柔化、屈服和峰后破坏四个阶段。随着温度的升高，灰岩的延性、峰值应变和破坏后的最大应变逐渐增大，峰后软化特征逐渐明显;而峰值应力和弹性模量逐渐减小。随着加载速率的增加，弹性阶段应力-应变曲线的斜率增大，变形参数和强度参数也相应增大。在T ≤ 500 °C和lr ≤ 0.01mm/s时，岩石试样发生破坏或拉剪混合破坏。在T> 500 °C和lr> 0.01mm/s时，岩石试样发生Y型剪切破坏。随着温度的升高和加载速率的增加，石灰石的破坏程度加剧。研究结果为高放核废物深埋地质贮存区的设计和建设、地热开发等高温岩石工程研究提供了科学依据。
Engineering problems associated with high-temperature rock, such as the deep disposal of high-level radioactive nuclear waste, underground gasification and storage of coal, development of geothermal resources, restoration of important buildings after a fire, among others, have drawn the interest of many engineers and become a new and developing field of rock mechanics. In our study, we conducted the uniaxial compression test under conditions of high temperatures (T) that range from 20 °C to 800 °C and loading rates (lr) that vary from 0.001 to 0.1 mm/s, using the MTS 816 rock mechanics testing system, with the aim to investigate the evolution of deformation and intensity parameters of the limestone. The results show that the uniaxial compression process of limestone at different temperatures and loading rates comprises four stages: compaction, flexibility, yielding and post-peak failure. With increasing temperature, the ductility of limestone, the peak strain and the maximum strain after failure increase, and the post-peak softening characteristics of limestone gradually become obvious; however, the peak stress and elastic modulus of limestone decrease gradually. With increasing loading rate, the slope of the stress–strain curve in the elastic stage increases, and the deformation and intensity parameters of limestone increase accordingly. AtT≤ 500 °C andlr≤ 0.01 mm/s, the rock specimens undergo failure or tension–shear mixed failure. AtT> 500 °C andlr> 0.01 mm/s, Y-shaped shear failure occurs in the rock specimens. The failure degree of the limestone becomes more severe with increasing temperature and loading rate. The results of this study provide a scientific basis for high-temperature rock engineering studies on the design and construction of deep geological underground storage areas for high-level radioactive nuclear wastes, geothermal development, among others.
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影响因子：
4.4
作者：
茅献彪;赵洪辉;尹乾;王辰
通讯作者：
王辰
DOI：
10.1016/s1365-1609(00)00071-x
发表时间：
2001-02
影响因子：
7.2
作者：
Z. X. Zhang;J. Yu;S. Kou;P. Lindqvist
通讯作者：
Z. X. Zhang;J. Yu;S. Kou;P. Lindqvist
DOI：
10.1016/j.ijmst.2015.07.015
发表时间：
2015-09-01
影响因子：
11.8
作者：
Mao Rongrong;Mao Xianbiao;Liu Ruixue
通讯作者：
Liu Ruixue
DOI：
10.1016/0148-9062(90)94328-q
发表时间：
1990-06
期刊：
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
影响因子：
--
作者：
K. Chong;A. Boresi
通讯作者：
K. Chong;A. Boresi
影响因子：
7.4
作者：
Y. Mahmutoğlu
通讯作者：
Y. Mahmutoğlu