论文部分内容阅读
深海能源土宏观力学特性与所处温度与水压环境密切相关,明晰温压对能源土力学特性的影响对水合物的安全开采具有重要意义。首先,介绍深海能源土的温度–水压–力学微观胶结模型,用以描述能源土粒间的水合物胶结接触力学特性;其次,将该模型导入至离散元商业软件PFC2D中,开展不同温度与水压环境下的离散元双轴试验;最后,结合离散元双轴试验结果及同已有室内试验结果的对比分析,探讨温度与水压对深海能源土宏观力学特性的影响规律和微观作用机理。结果表明:引入胶结模型的离散元双轴试验可较好地描述深海能源土强度、变形等力学特性随温度与水压的变化关系;温度与水压影响深海能源土宏观力学特性的微观机理是颗粒间水合物胶结强度与刚度同温度与水压间的相关性;建议采用温压距离参数L(在无量纲化的温度–水压坐标平面内,水合物赋存温度与水压点至其相平衡线的最小距离)评价实际复杂温压场下的深海能源土宏观力学特性。
The macroscopic mechanical properties of deep-sea energy sources are closely related to the temperature and the hydrostatic environment in which they are located. It is of great significance to clarify the effect of temperature and pressure on the mechanical properties of energy sources for the safe exploitation of hydrates. First, the temperature-hydraulic-mechanical microscopic cementing model of deep-sea energy soil is introduced to describe the hydration-cementing contact mechanics characteristics of energy soil particles. Secondly, the model is imported into the discrete element commercial software PFC2D to carry out temperature- Hydraulic pressure environment; finally, combining the results of discrete element biaxial test and the comparison with the existing laboratory test results, the influence of temperature and pressure on the macroscopic mechanical properties of deep-sea energy soils and the microscopic mechanism . The results show that the discrete element biaxial test with cementation model can well describe the relationship between the mechanical properties such as the strength and deformation of deep-sea energy sources with temperature and water pressure. The micro-mechanism of the influence of temperature and water pressure on the macroscopic mechanical properties of deep- Intergranular hydrate cementation strength and stiffness with the temperature and water pressure correlation; recommended temperature and pressure distance parameter L (in non-dimensional temperature-pressure coordinate plane, hydrate storage temperature and water pressure point to its The minimum distance of the phase equilibrium line) to evaluate the macroscopic mechanical properties of deep-sea energy soils under the actual complex temperature and pressure field.