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首先,引入笔者等[16-17]所提出的微观胶结模型用以反映能源土颗粒之间水合物微观胶结接触力学特性;其次,采用C++语言将模型程序化,建立同商业软件PFC2D的程序接口,将模型引入离散单元法中;然后,通过简化计算方法确定胶结宽度随水合物浓度的变化规律,进而确定水合物微观胶结参数;最后,根据所确定的胶结参数,针对不同水合物浓度试样进行能源土宏观力学特性离散元双轴试验模拟,并从应力应变、体积应变、水合物对能源土弹性模量的影响等方面与Masui等[4]所进行的能源土室内三轴试验进行对比分析。结果表明:所选择胶结模型及微观胶结参数能有效反映深海能源土宏观力学规律;能源土峰值强度、弹性模量均随水合物浓度增加而增加,体积膨胀随水合物浓度的增加越来越显著。
Firstly, the micro-cementation model proposed by author [16-17] is introduced to reflect the micro-cemented contact mechanics of hydrate between particles of energy source soil. Secondly, the model is programmed by using C ++ language and the program interface with commercial software PFC2D is established , The model was introduced into the discrete element method. Then, the changing law of the cementation width with the hydrate concentration was determined by the simplified calculation method, and then the micro-cementation parameters of the hydrate were determined. Finally, according to the determined cementation parameters, The macro-mechanical properties of energy source soil were simulated by discrete element biaxial test. Compared with the energy triaxial test conducted by Masui et al. [4] in terms of stress-strain, volumetric strain and the effect of hydrate on the elastic modulus of energy soil analysis. The results show that the selected cementation model and micro-cementation parameters can effectively reflect the macro-mechanical laws of deep-sea energy sources. The peak energy and elastic modulus of energy sources increase with the increase of hydrate concentration, and the volume expansion becomes more and more significant with the increase of hydrate concentration .