| 水合物沉积物力学性质的三维离散元分析 |
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| 引用本文： | 杨期君,赵春风.水合物沉积物力学性质的三维离散元分析[J].岩土力学,2014,35(1):255-262. |
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| 作者姓名： | 杨期君 赵春风 |
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| 作者单位： | 1. 同济大学 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 摘 要： | 水合物沉积物力学特性研究是天然气水合物开采领域中的热点问题。为深入了解水合物对沉积物力学特性的影响，在提出一个新的水合物沉积物离散元数值试样制备方法的基础上，模拟了不同水合物饱和度沉积物试样的三轴排水试验，并从其应力-应变关系、体变特性、弹性模量及峰值强度等方面对模拟结果及已有室内三轴试验结果进行了对比，然后利用该方法对具有不同微观胶结参数的水合物沉积物样进行了三轴离散元数值试验。研究结果表明：所提出的离散元模拟方法能较好地反映水合物沉积物的主要力学特性；天然气水合物与土颗粒间胶结性能的改变会对水合物沉积物的力学响应产生一定的影响；水合物沉积物强度和模量的增加是孔隙填充水合物和粒间胶结水合物共同作用的结果。
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| 关 键 词： | 水合物沉积物 力学性质 离散元法 三轴排水试验 |
| 收稿时间： | 2012-11-06 |
Three-dimensional discrete element analysis of mechanical behavior of methane hydrate-bearing sediments |
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| YANG Qi-jun,ZHAO Chun-feng.Three-dimensional discrete element analysis of mechanical behavior of methane hydrate-bearing sediments[J].Rock and Soil Mechanics,2014,35(1):255-262. |
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| Authors: | YANG Qi-jun ZHAO Chun-feng |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | The mechanical behavior of methane hydrate-bearing sediments has been a research focus in the area of exploiting methane hydrate from deep seabed currently. This paper presents a numerical analysis of mechanical behavior of hydrate-bearing sediments by using the discrete element method (DEM). Firstly, a new method for preparing hydrate-bearing samples in the DEM simulation is proposed. Then, a series of numerical simulations of drained triaxial tests are performed on hydrate-bearing sediments with different hydrate saturations. And the simulation results are compared with the test results obtained in the laboratories. Finally, some numerical experiments on hydrate-bearing sediments with different micro-bond parameters are performed using the same method. The study shows that the DEM simulation is able to capture the main mechanical characteristics of hydrate-bearing sediments; and their mechanical properties will change with the variation of the properties of the bond between methane hydrate and soil particles. Furthermore, it is found that both of their peak strength and elastic modulus are enhanced by the presence of methane hydrate in hydrate-bearing sediments with the forms of cementation and pore-filling in combination. |
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| Keywords: | methane hydrate-bearing sediments mechanical behavior discrete element method drained triaxial test |
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