Assessment of the properties of polycrystalline rock salt synthesized under nominally dry and wet conditions
Assessment of the properties of polycrystalline rock salt synthesized under nominally dry and wet conditions
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名义干燥和潮湿条件下合成的多晶岩盐的性能评估
DOI：
10.1016/j.jrmge.2020.09.010
复制
发表时间：
2021
影响因子：
7.3
通讯作者：
Alshibli, Khalid
中科院分区：
文献类型：
--
作者：
Moslehy, Amirsalar;Alshibli, Khalid
多晶岩盐的压缩是所施加的应力、暴露于所施加的应力的持续时间、环境温度和含水量的函数。盐岩在不同条件下的压缩行为及其对试样力学性能的影响已在文献中进行了研究。然而，多晶岩盐在不同含水量下的一维（1D）压缩行为以及在不同含水量下试样的压缩如何进一步影响其物理和力学性质尚未完全了解。在这项研究中，多晶岩盐样品制备名义上的干燥和潮湿的条件下，一些干燥和潮湿的样品进行退火后的准备。在一维压缩过程中的试样的孔隙率和所施加的轴向应力的对数之间的关系被发现遵循线性关系后，达到独特的临界孔隙率为32%和37%的干试样，分别。卸载和重新加载样本不会导致样本孔隙率发生任何重大变化。在潮湿条件下压缩的试样显示出2.6%的平均最终孔隙率，而干燥试样为6.9%。压缩后退火的干试样和湿试样分别与干试样和湿试样相比表现出较低的孔隙率。无侧限抗压试验表明，干、湿试样的平均无侧限抗压强度（σ u）分别为64.3和16.2MPa。退火使干燥试样的σ u降低到39.6MPa，使湿试样的σ u增加到41MPa。
Polycrystalline rock salt’s compression is a function of applied stresses, exposure duration to the applied stresses, ambient temperature, and water content. Rock salt’s compressional behavior under different conditions and its effects on the specimens’ mechanical properties have been investigated in the literature. However, the one-dimensional (1D) compression behavior of polycrystalline rock salt at various water contents and how the specimen’s compression at different water contents further affects its physical and mechanical properties are not fully understood yet. In this study, polycrystalline rock salt specimens were prepared under nominally dry and wet conditions and some of the dry and wet specimens were annealed after the preparation. The relationship between the porosity of the specimens and the logarithm of the applied axial stresses during the 1D compression was found to follow a linear relationship after reaching unique critical porosities of 32% and 37% for the dry and wet specimens, respectively. Unloading and reloading the specimens did not result in any major changes in the porosity of the specimens. The specimens compressed under wet condition showed an average final porosity of 2.6% compared to 6.9% for the dry specimens. The dry and wet specimens that were annealed after the compression exhibited a lower porosity in comparison to the dry and wet specimens, respectively. Unconfined compression experiments on the specimens showed dry and wet specimens possess averaged unconfined compressive strengths (σ u) of 64.3 and 16.2 MPa, respectively. Annealing decreased σ u of the dry specimens to 39.6 MPa and increased σ u of the wet specimens to 41 MPa.
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