Creep Behavior of Intact and Cracked Limestone Under Multi-Level Loading and Unloading Cycles
Creep Behavior of Intact and Cracked Limestone Under Multi-Level Loading and Unloading Cycles
复制标题
多级加载和卸载循环下完整和破裂石灰石的蠕变行为
DOI：
10.1007/s00603-017-1187-1
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发表时间：
2017-02
影响因子：
6.2
通讯作者：
Wang Weijun
中科院分区：
文献类型：
--
作者：
Zhao Yanlin;Zhang Lianyang;Wang Weijun
对完整和开裂的茅口灰岩试样进行了多级加卸载循环下的三轴蠕变试验。提出了一种新的数据处理算法，对试验数据进行分析，将总应变分为瞬时应变和蠕变应变，瞬时应变由瞬时弹性应变和瞬时塑性应变组成，蠕变应变由粘弹性应变和粘塑性应变组成。结果表明，黏弹性应变随时间收敛到某一值，粘塑性应变随时间不断增大，但两者都随偏应力增大而增大。偏应力越大，粘塑性应变占蠕变总应变的比例越大。稳态蠕变应变率随偏应力的增大或围压的降低而增大，稳态蠕变应变率与偏应力的关系可用指数表达式来描述。研究结果还表明，石灰岩中的预存裂纹对其蠕变特性有很大的影响。在相同围压和偏应力下，裂隙灰岩的瞬时应变和蠕变应变（特别是粘塑性应变）、初始蠕变持续时间和稳态蠕变应变速率均比完整灰岩大。
A series of triaxial creep tests were carried out on intact and cracked Maokou limestone specimens under multi-level loading and unloading cycles. A new data processing algorithm is proposed to analyze the experimental data and divide the total strain into instantaneous and creep strains, with the instantaneous strain consisting of instantaneous elastic and plastic strains and the creep strain consisting of viscoelastic and visco-plastic strains. The results show that the viscoelastic strain converges to a certain value with time, but the visco-plastic strain keeps increasing with time, although both tend to increase with higher deviatoric stress. The ratio of the visco-plastic strain to the total creep strain also tends to increase when the deviatoric stress is higher. The steady-state creep strain rate increases with higher deviatoric stress or lower confining pressure, and the relation between the steady-state creep strain rate and the deviatoric stress can be well described by an exponential expression. The results also show that the preexisting cracks in the limestone have a great effect on its creep properties. At the same confining pressure and deviatoric stress, the cracked limestone shows larger instantaneous and creep strains (especially visco-plastic strains), longer duration of primary creep, and a higher steady-state creep strain rate than the intact limestone.
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影响因子：
7.4
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
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发表时间：
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影响因子：
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通讯作者：
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DOI：
10.1016/j.ijrmms.2011.04.015
发表时间：
2011-07-01
影响因子：
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