| 高温后花岗岩循环加卸载力学行为数值模拟 |
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| 引用本文： | 周传涛,田文岭,杨圣奇,甄治国.高温后花岗岩循环加卸载力学行为数值模拟[J].科学技术与工程,2023,23(27):11768-11777. |
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| 作者姓名： | 周传涛 田文岭 杨圣奇 甄治国 |
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| 作者单位： | 中铁二十局集团第四工程有限公司;中国矿业大学 力学与土木工程学院 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 高放核废料处置库在开挖和使用过中围岩不断承受周期荷载,进而影响了高放核废料处置库的安全稳定。基于此,本文使用数值模拟方法研究了高温作用后花岗岩循环加卸载力学行为,在得到一组可以反映高温作用后花岗岩三轴压缩力学行为细观参数的基础上,分析了温度及围压对循环加卸载应力-应变曲线、弹性模量和破裂过程的影响。研究结果表明,常温下循环加卸载应力-应变曲线与单调加载吻合较好,循环加卸载造成宏观裂纹两侧晶粒脱落；600°C高温处理后,单轴循环加、卸载过程都会对应微裂纹增加,导致应力-应变曲线偏离较多。而高围压限制了卸载过程微裂纹数目增加及Felicity效应,循环加卸载峰值强度与单调加载差距明显减小,但循环加卸载会造成宏观裂纹两侧出现晶粒压碎现象。弹性模量随循环次数变化主要分为峰前阶段、峰后破裂阶段及残余强度阶段。600°C处理后试样内存在大量热裂纹,弹性模量峰前阶段会存在明显上升阶段,且对围压更加敏感。
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| 关 键 词： | 岩石力学 花岗岩 循环加卸载 GBM 高温 |
| 收稿时间： | 2022/12/4 0:00:00 |
| 修稿时间： | 2023/9/11 0:00:00 |
Study on mechanical behavior of Granite after Thermal Treatment under cyclic Loading-unloading compression |
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| Zhou Chuantao,Tian Wenling,Yang Shengqi,Zhen Zhiguo.Study on mechanical behavior of Granite after Thermal Treatment under cyclic Loading-unloading compression[J].Science Technology and Engineering,2023,23(27):11768-11777. |
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| Authors: | Zhou Chuantao Tian Wenling Yang Shengqi Zhen Zhiguo |
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| Affiliation: | China Railway th Bureau Group th Engineering Co Ltd,Qingdao;School of mechanics and civil engineering,China University of Mining and Technology,Xuzhou |
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| Abstract: | During the excavation and using process of the High level nuclear waste (HLW) disposal repository, the surrounding rock bear the periodic loading, which has a significant effect on the safe and stable operation of HLW disposal repository. Therefore, numerical simulation were adopted to investigate the mechanical behavior of thermal treated granite under triaxial tiered cyclic loading-unloading compression. After obtained a group of micro-parameters which can simulated the mechanical behavior of thermal treated granite under triaxial compression, the variation of stress-strain curves, elastic modulus and failure process with temperature and confining pressure was analyzed. And, the results show that the stress-strain curves of granite under cyclic loading are in good agreement with that under monotonic loading at room temperature, but cyclic loading lead to the grain fall off near the macro-crack. The difference of stress-strain between cyclic and monotonic loading is obvious when T = 600°C under uniaxial compression, which due to that the increase of micro-crack during the loading and unloading process. However, confining pressure can restrain the increase of micro-crack during the unloading process and Felicity effect, and results in the difference of stress-strain curves between cyclic and monotonic loading decreases, but cyclic loading result in the grain crushing near the macro-crack. The variation of the elastic modulus with cycle number can be divided as the pre-peak stage, post-peak fracture stage and residual strength stage. Due to a lot of thermal cracks were induced by high temperature when T = 600°C, elastic modulus increases obviously at initial loading stage, and it more sensitive to confining pressure. |
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| Keywords: | rock mechanics granite cyclic loading-unloading compression GBM high temperature |
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