1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
Abstract:Methane hydrate (MH), which has significant influences on the strength of methane hydrate bearing soils, exits mainly in the form of cement materials between soil particles. Hence, the study of bond mechanical behavior of MH between soil particles is significant to the research of methane hydrate bearing soils, of which the key point is the determination of the micro-contact model and corresponding bond parameters of MH. First, a micro-bond contact model is introduced to reflect the contact properties of the soil particles. Second, the strengths and elastic modulus of MH (such as the tensile strength、compressive strength, shear strength and torsion strength) are obtained through the literatures about methane hydrate triaxial tests. Finally, micro bond parameters needed by the contact model are obtained. The results show that the micro bond parameters of gas hydrate are determined by the saturation and strength parameters of gas hydrate, which can be obtained through the temperature, density of hydrate and its burial depth which are easy to be determined.
蒋明镜, 肖俞, 朱方园. 深海能源土微观力学胶结模型及参数研究[J]. 岩土工程学报, 2012, 34(9): 1574-1583.
JIANG Ming-jing, XIAO Yu, ZHU Fang-yuan. Micro-bond contact model and its parameters for the deep-sea methane hydrate bearing soils. Chinese J. Geot. Eng., 2012, 34(9): 1574-1583.
[1] YU F, SONG Y C, LIU W G, LI Y H, LAM W. Analyses of stress strain behavior and constitutive model of artificial methane hydrate[J]. Journal of Petroleum Science and Engineering, 2011, 77: 183–188.[2]蒋明镜, 肖 俞, 刘 芳. 深海能源土开采对海床稳定性的影响研究思路[J]. 岩土工程学报, 2010, 32(9): 1412–1417. (JIANG Ming-jing, XIAO Yu, LIU Fang. Methodology for assessing seabed instability induced by exploitation of methane hydrate[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(9): 1412–1417. (in Chinese))[3] BRUGADA J, CHENG Y P, SOGA K, SANTAMARINA J C. Discrete element modeling of geomechanical behavior of methane hydrate soils with pore-filling hydrate distribution[J]. Granular Matter, 2010, 12(5): 517–525.[4] HYODO M, NAKATA Y, YOSHIMOTO N, EBINUMA T, Basic research on the mechanical behavior of methane hydrate-sediments mixture[J]. Japanese Geotechnical Society, 2005, 45(1): 75–85.[5] MASUI A, HANEDA H, OGATA Y, et al. Eeffects of methane hydrate formation on shear strength of synthetic methane hydrate sediments[C]// The 5th International Offshore and Polar Engeering Conference. Korea, 2005. [6] DELENNE J Y, YOUSSOUFI M S E, CHERBLANC F et al. Mechanical behavior and failure of cohesive granular materials[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2004, 28: 1577–1594.[7] WANG Y H, LEUNG S C. A particulate-scale investigation of cemented sand behavior[J]. Canadian Geotechnical Journal, 2008, 45: 29–44.[8] WANG Y H, LEUNG S C. Characterization of cemented sand by experimental and numerical investigations[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2008, 134(7): 992–10040.[9] JIANG M J, YU H S, HARRIS D. Bonding rolling resistance and its effect on yielding of bonded granulates by DEM analyses[J]. International Journal for Numerical and Analytical Methods Geomechanics, 2006, 30: 723–761.[10] JIANG M J, YU H S, LEROUEIL S. A simple and efficient approach to capturing bonding effect in naturally microstructured sands by discrete element method[J]. International Journal for Numerical Methods in Engineering, 2007, 69: 1158–1193.[11] JIANG M J, YAN H B. Micro-contact laws of bonded granular materials for DEM numerical analyses[C]// APCOM’07 - EPNESC XI. Kyoto, Japan, 2007.[12] 蒋明镜, 孙渝刚, 李立青. 胶结颗粒接触力学特性测试装置研制[J]. 岩土力学, 2011, 32(1): 309–315. (JIANG Ming-jing, SUN Yu-gang, LI Li-qing. Development of experimental apparatus for contact behavior of bonded granules[J]. Rock and Soil Mechanics, 2011, 32(1): 309–315. (in Chinese))[13] 蒋明镜, 孙渝刚, 李立青. 复杂应力下两种胶结颗粒微观力学模型的试验研究[J]. 岩土工程学报, 2011, 33(3): 354–360. (JIANG Ming-jing, SUN Yu-gang, LI Li-qing. Experimental study on micro-mechanical model for two different bonded granules under complex stress conditions[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(3): 354–360. (in Chinese))[14] 蒋明镜, 肖 俞, 孙渝刚, 等. 水泥胶结颗粒的微观力学模型试验[J]. 岩土力学, 2012, 33(5): 1293–1299. (JIANG Ming-jing, XIAO Yu, SUN Yu-gang, et al. Experimental investigation on a micro-mechanical model of cement-bonded particles[J]. Rock and Soil Mechanics, 2012, 33(5): 1293–1299. (in Chinese))[15] WINTERS W J, DILLON W P, PECHER I A, MASON D H. GHASTLI — determining physical properties of sediment containing natural and laboratory-formed gas hydrate. Coastal systems and continental margins[C]// Natural Gas Hydrate in Oceanic and Permafrost Environments. Netherlands: Kluwer Academic Publishers, 2000: 311–322.[16] DIVAKAR M P, FAFITIS A. Micromechanics-based constitutive model for interface shear[J]. Journal of Engineering Mechanics, ASCE, 1992, 118(7): 1317–1337.[17] BORTOLOTTI L, CARTA S, CIREDDU D. Unified yield criterion for masonry and concrete in multiaxial stress states[J]. Jorunal of Materials in Civil Engineering, ASCE, 2005, 17(1): 54–62.[18] ELLYIN F, XIA Z H. Nonlinear viscoelastic constitutive model for thermoset polymers[J]. ASME International Mechanical Engineering Congress, Orlando, FL, 2005.[19] DVORKIN J, HELGERUD M B, WAITE W F, et al. Introduction to physical properties and elasticity models[C]// Natural Gas Hydrate In Oceanic and Permafrost Environments. Netherlands, 2000: 245–260.[20] CHOI J H, KOH B H. Compressive strength of ice-powder pellets as portable media of gas hydrate[J]. International Journal of Precision Engineering and Manufacturing, 2009, 10(5): 85–88.[21] NABESHIMA Y, MATSUI T. Static shear behaviors of methane hydrate and ice[C]// The Fifth Oceanic Mining Symposium. Japan, 2003.[22] JEAN-PAUL N, BERNARD M. Yield and failure envelope for ice under multriaxial compressive stresses[J]. Cold Regions Science and Technology, 1986, 13: 75–82.[23] CUNDALL P A. PFC2D User’s manual (Version 3.0) [R]. Minnesota: Itasca Consulting Group Inc, 2004.[24] 蒋明镜, 肖 俞, 朱方园. 深海能源土宏观力学性质离散元数值模拟分析[J]. 岩土工程学报, 2012, 待刊. (JIANG Ming-jing, XIAO Yu, ZHU Fang-yuan. Numerical simulation of macro-mechanical properties of deep-sea methane hydrate bearing soils by DEM[J]. Chinese Journal of Geotechnical Engineering, 2012, in press. (in Chinese))