An SMP critical state model for methane hydrate-bearing sands

作者：Lin Jeen Shang^*; Seol Yongkoo; Choi Jeong Hoon

来源：International Journal for Numerical and Analytical Methods in Geomechanics, 2015, 39(9): 969-987.

DOI：10.1002/nag.2347

• constitutive model
• methane hydrates
• SMP model
• critical state
• subloading model

Mechanical properties of methane hydrate-bearing soils are complex. Their behavior undergoes a significant change when hydrates dissociate and become methane gas. On the other hand, methane hydrates are ice-like compounds and, depending on the hydrate accumulation habits and the degree of hydrate saturation, may cement soil particles into stronger and stiffer soils. A new constitutive model is proposed that is capable of capturing essential characteristics of hydrate-bearing soils. The core of the model includes the spatial mobilized plane concept; a transformed stress, t(ij); the critical state; and the subloading framework. The proposed model gives soil responses due to stress changes or hydrate saturation changes or both. The performance of the model has been found satisfactory, over a range of hydrate saturation and confining pressures, using triaxial test data from laboratory-synthesized samples and from field samples extracted from Nankai Trough, Japan.

• 出版日期2015-6-25