Experimental Study on Mechanical Properties of Hydrate-Bearing Sand: The Influence of Sand-Water Mixing Methods
Experimental Study on Mechanical Properties of Hydrate-Bearing Sand: The Influence of Sand-Water Mixing Methods
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含水砂力学性能试验研究：砂水混合方式的影响
DOI：
10.3390/en14092554
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发表时间：
2021-04
期刊：
影响因子：
3.2
通讯作者：
Xiang Sun
中科院分区：
文献类型：
--
作者：
Weiguo Liu;Dedong Pan;Shi Shen;Zeshao You;Yuechao Zhao;Xiang Sun
针对野外取心困难的问题，采用人工合成试样对含水合物沉积物的力学性质进行了实验研究。在实验研究中，用于分析HBS的机械性能的代表性合成样品需要在样品的孔隙中均匀分布水合物。然而，用不适当的砂-水混合方法制成的试样可能具有不均匀的水分布，从而导致在应用冰种法形成水合物时水合物分布不均匀。本研究采用了三种方法在形成水合物之前将沙子和水混合，并应用低场核磁共振（NMR）技术研究这些方法如何影响水合物的分布，进而影响力学性能。为了分析HBS的力学性能，我们进行了排水三轴试验。如低场NMR所示，当我们压实砂-水混合物样品并在水合物形成之前将其倒置冷冻时，获得了具有均匀水分布的样品。随后，水合物在HBS中也均匀分布。应力-应变曲线表现出不同的应变软化和硬化模式，由于不同的水合物分布。此外，水合物分布均匀的样品具有更高的初始弹性模量和强度比其他方法制备的样品。
Laboratory-synthesized specimens are employed for an experimental study on the mechanical properties of hydrate-bearing sediments (HBS) due to the difficulty of field coring. A representative synthesized sample for the analysis of the mechanical properties of HBS in the experimental study requires evenly distributed hydrates in the pores of the sample. However, a specimen made with an improper sand–water mixing method might have an uneven water distribution, resulting in an uneven hydrate distribution when applying the ice-seeding method for hydrate formation. This study adopted three kinds of methods to mix sand and water before forming hydrates and applied the low-field nuclear magnetic resonance (NMR) technique to investigate how these methods affect the hydrate distribution, further affecting the mechanical properties. To analyze the mechanical properties of HBS, we conducted drained triaxial tests. As shown in low-field NMR, when we compacted a sample of the sand–water mixture and froze it upside-down before hydrate formation, a sample with an even water distribution was obtained. Subsequently, the hydrate in HBS distributed also evenly. The stress-strain curves present different strain softening and hardening patterns due to the different hydrate distributions. Moreover, the samples with the evenly distributed hydrates have higher initial elastic modulus and strength than the ones made with other methods.
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水合物非均质分布对含水合物沉积物力学特性的影响分析
影响因子：
5.3
作者：
Liu Jian-Wu;Li Xiao-Sen;Kou Xuan;Wang Yi;Li Li-Jia
通讯作者：
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影响因子：
3.1
作者：
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W. Winters;I. Pecher;W. Waite;D. H. Mason
DOI：
10.1021/jp052071w
发表时间：
2005-09
期刊：
The journal of physical chemistry. B
影响因子：
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作者：
Shuqiang Gao;W. House;Walter G Chapman
通讯作者：
Shuqiang Gao;W. House;Walter G Chapman
DOI：
10.1007/s13202-018-0441-8
发表时间：
2018-12
影响因子：
2.2
作者：
E. Rabbani;A. Davarpanah;M. Memariani
通讯作者：
E. Rabbani;A. Davarpanah;M. Memariani
影响因子：
2.200
作者：
O. A. Rozentsvet;V. R. Filin;S. V. Saksonov;V. V. Meshcheryakov
通讯作者：
V. V. Meshcheryakov