【摘要】 以颗粒流数值软件PFC2D为计算平台,采用数值模拟技术并结合已有的土工试验结果,从宏、微、细观不同尺度和能量耗散角度,展开对砂土在慢速往复荷载作用下表现出的宏观力学响应、微观结构变化、细观力链演变以及能量耗散规律等方面的研究。结果表明数值模型能较好再现砂土的宏观力学响应,颗粒旋转、翻滚、下沉以及上升等内部结构变化,以及强弱力链的形成与重构,并能动态跟踪不同能量的变化,进一步揭示了砂土在连续变形过程中的细观力学机制及其能量耗散机理。更多还原

【Abstract】 The PFC2D numerical simulation software is taken as the calculating platform to simulate the mechanic behavior of sands under slow cyclic loading.Based on the existing test results and simulation results,the change of microcosmic structure and the evolution of the force chain are studied from different scales(micro,meso and macro) and new angle based energy dissipation and thermomechanics.The results show that with this model the macro mechanical behavior of sands can be reappeared;the rotation,roll,going down and up of particle and the formation and reconstitution of force chain can be seen;the dynamic change of different energy can be tracked.The mesoscopic deformation mechanism and energy dissipation mechanism of sands are further revealed.更多还原