Based on the particle flow software PFC3D,the influence of mesoscopic parameters on the stress-strain curve of concrete splitting tensile test is analyzed,which provides a theoretical basis for the calibration of mesoscopic parame-ters of discrete element numerical simulation.The influence of micro parameters such as friction coefficient,effective modulus of parallel bonding model,cohesive force,tensile stress,friction angle,and normal damping rate on the re-sults of concrete splitting tensile test was investigated by controlling variables.The research results indicate that the ef-fective modulus of the parallel bonding model has a significant impact on the macroscopic elastic modulus.As the ef-fective modulus increases,the macroscopic elastic modulus gradually increases,showing a significant linear relation-ship.The cohesion,tensile stress,and friction angle of the parallel bonding model determine the peak strength of mac-roscopic materials.The influence of tensile stress and friction angle is relatively small,while cohesion plays a decisive role in the peak strength.As the cohesion increases,the peak strength increases linearly.The influence of friction co-efficient and normal damping rate on the stress-strain curve can be ignored.The research results are of great signifi-cance for quickly and reasonably determining the micro parameter calibration of parallel bonding models in concrete nu-merical simulation.
关键词
劈裂抗拉/离散元数值模拟/平行黏结模型/细观参数/应力-应变
Key words
splitting tensile strength/discrete element numerical simulation/parallel bond model/microscopic parameters/stress-strain
维普
万方数据