混凝土试件温度裂缝的颗粒流数值模拟

Simulation of concrete specimens temperature cracks using particle flow code

目前,针对大体积混凝土的温度裂缝问题虽然已经取得了不少成果,但现有的成果大多都是基于连续介质理论。本文应用颗粒流程序PFC2D,对水工材料混凝土试件双轴试验破坏的全过程进行了数值模拟,由此选取混凝土的细观参数;文章模拟了寒潮工况下降温幅度及降温历时对混凝土温度裂缝的影响,从细观角度对混凝土的温度裂缝问题进行了初步探讨。模拟结果表明,在温度应力作用下颗粒流法能够较好地模拟混凝土块的开裂过程,模拟过程中试样裂缝形态符合大体积混凝土块在寒潮和基础强约束条件下的裂缝分布规律。

In simulation of temperature cracks of mass concrete, great achievements have been made recent years, but most of them are based on the continuum theory. This study simulates the full failure process of concrete biaxial test using a particle flow code PFC2D, and this is used for determination of micro-prospective parameters of concrete, focusing on temperature cracks of concrete under cold waves of different temperature drops and durations. Results show that the simulated cracking propagations are consistent with the crack distributions observed in previous studies and PFC2D is accurate and reliable for simulation of concrete cracks development induced by temperature dropping.