کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6435299 1637173 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental research on the mechanical properties of methane hydrate-bearing sediments during hydrate dissociation
ترجمه فارسی عنوان
تحقیقات تجربی بر خواص مکانیکی رسوبات هیدراته متان در هنگام جداسازی هیدراتها
کلمات کلیدی
رسوبات هیدراته متان، تجزیه هیدرات ویژگی های مکانیکی، معیار محرک کولن،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی


- The cementation between hydrates and soil particles increases the strength.
- The strength of the sediments is reduced by hydrate dissociation.
- The slower dissociation rate results in the declining pace of strength reduction.
- E0 decreases slightly while ES decreases sharply during the hydrate dissociation.
- The M-C strength criterion related to the hydrate dissociation time is proposed.

This paper describes studies of the effect of hydrate dissociation on the safety and stability of methane hydrate-bearing sediments. Methane hydrates within the sediments were dissociating under the conditions of a confining pressure of 0.5 MPa, 1 MPa, 2 MPa and a temperature of −5 °C. After 6 h, 24 h, or 48 h, a series of triaxial compression tests on methane hydrate-bearing sediments were performed. The tests of ice-clay and sediments without hydrate dissociation were performed for comparison. Focusing on the mechanical properties of the sediments, the experimental results indicated that the shear strength of the ice-clay mixtures was lower than that of the methane hydrate-bearing sediments. The strength of the sediments was reduced by hydrate dissociation, and the strength tended to decrease further at the lower confining pressures. The secant modulus ES of the sediments dropped by 42.6% in the case of the dissociation time of the hydrate of 48 h at the confining pressure of 1 MPa; however, the decline of the initial yield modulus E0 was only 9.34%. The slower hydrate dissociation rate contributed to reducing the failure strength at a declining pace. Based on the Mohr-Coulomb strength theory, it was concluded that the decrease in strength was mainly affected by the cohesive reduction. Moreover, the mathematical expression of the M-C criterion related to the hydrate dissociation time was proposed. This research could be valuable for the safety and stability of hydrate deposits in a permafrost region.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine and Petroleum Geology - Volume 51, March 2014, Pages 70-78
نویسندگان
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