橡胶混凝土受压破坏机理的余能基面力元分析

建立橡胶混凝土二维混合随机骨料模型，基于余能原理基面力元法对橡胶混凝土的细观力学性能进行分析，获得了应力-应变曲线图、破坏过程图和最大主应力、应变云图，模拟了橡胶混凝土破坏过程，分析了橡胶混凝土受压破坏机理，并探究了橡胶颗粒的不同粒径及掺量对橡胶混凝土抗压强度的影响。结果表明，抗压强度随着橡胶掺量的提高，明显降低。相同掺量下，采用大粒径的橡胶颗粒可以使抗压强度略有提高。破坏最开始发生于橡胶颗粒较为密集区域，故而在配置橡胶混凝土时应尽量将橡胶颗粒分散均匀。该模型为分析并预测橡胶混凝土的细观力学性能提供了新方法。

Analysis of Compression Failure Mechanism of Rubber Concrete by Base Force Element Method Based on Complementary Energy Principle

The two-dimensional mixed random aggregate model of rubber concrete is established, and the meso mechanical properties of rubber concrete are analyzed by base force element method based on the complementary energy principle. The stress-strain curve, failure process diagram and maximum principal stress and strain cloud diagram are obtained. The failure process of rubber concrete is simulated, the compression failure mechanism of rubber concrete is analyzed, and the influence of different particle sizes and contents of rubber particles on the compressive strength of rubber concrete is explored. The results show that the compressive strength decreases obviously with the increase of the rubber content. At the same dosage, the compressive strength can be slightly improved by using rubber particles with a large particle size. The damage first occurs in the area with dense rubber particles, so the rubber particles should be dispersed evenly as far as possible when configuring rubber concrete. The model can reasonably simulate the failure process of rubber concrete under uniaxial compression, and provides a new method for analyzing and predicting the micromechanical properties of rubber concrete.