Experimental Study on the In Situ Mechanical Properties of Methane Hydrate-Bearing Sediments
Experimental Study on the In Situ Mechanical Properties of Methane Hydrate-Bearing Sediments
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DOI：
10.4028/www.scientific.net/amm.275-277.326
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
Zhongqiang Sun;Jian Zhang;Changling Liu;S. Zhao;Y. Ye
中科院分区：
文献类型：
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作者：
Zhongqiang Sun;Jian Zhang;Changling Liu;S. Zhao;Y. Ye
时域反射仪（TDR）的引入，解决了如何准确测量水合物饱和度的问题.在有效围压为1、2和4 MPa，平均水合物饱和度为15.71、35.7和56.49%，应变速率为0.8%/min的条件下，对含甲烷水合物沉积物进行了一系列不排水三轴试验。但最大破坏时间随有效围压的增大而减小。根据莫尔-库仑破坏准则，分析了含甲烷水合物沉积物的抗剪强度。结果表明，内摩擦角对水合物饱和度不敏感，而粘聚力对水合物饱和度有很强的依赖性。
TDR was introduced to solve the problem of how to measure hydrate saturation accurately. Then a series of un-drained triaxial tests were carried out on methane hydrate-bearing sediments under various conditions with effective confining pressures at 1, 2 and 4 MPa, average hydrate saturations at 15.71, 35.7 and 56.49% and strain rate at 0.8%/min. The results indicate that the shear strength increases with the increases of effective confining pressure and hydrate saturation, but the maximum failure time decreases with the increasing effective confining pressures. According to Mohr-Coulomb failure criterion, the shear strength of methane hydrate-bearing sediments was analyzed. It can be found that the internal friction angles are not sensitive to hydrate saturation, but the cohesion shows a high hydrate saturation dependency.