基于细观建模的堆石混凝土抗压试验的数值模拟

Numerical simulation of rockfill concrete compression test based on meso-modeling

从细观结构的角度出发,将堆石混凝土视为堆石体与自密实混凝土组合形成的复合材料,利用MATLAB与ANSYS/LS-DYNA软件建立了三维有限元模型,然后在此基础上进行了堆石混凝土模型抗压试验的数值模拟.探讨分析了应变率和堆石与混凝土粘结强度对堆石混凝土的抗压强度的影响.结果表明:堆石混凝土的抗压强度随着应变率的增大而增大,且随着粘结强度的增大而增大,但是堆石混凝土对应变率的敏感性较高,对粘结强度的敏感性较低.

From the perspective of micro-structure,the rockfill concrete is regarded as a composite material formed by the combination of rockfill body and self-compacting concrete.Herein,a three-dimensional finite element model was established by using MATLAB and ANSYS/LS-DYNA software.Based on this,the numerical simulation of splitting tensile test of rockfill concrete model was carried out,and the influence of loading rate on the tensile strength,failure mode and crack extension process of rockfill concrete were discussed and analyzed.The conclusions indicate that the compressive strength of the rock-filled concrete increases with the increase of both the strain rate and the bond strength.However,the rock-filled concrete is more sensitive to strain rate and less sensitive to bond strength.