级配碎石双轴数值试验方法及其影响因素

Biaxial Numerical Simulation on Graded Broken Stone and Its Influence Factors

利用颗粒流理论建立了级配碎石(GBS)接触本构模型,同时构建了级配碎石双轴数值试验方法.分析了双轴数值试验的影响规律,并验证了双轴数值试验方法的可靠性.结果表明:采用应变率控制模式比采用位移控制模式所得数值试验结果更稳定;加载速率为0.5%·min-1、试件尺寸为Φ300mm×h600mm时,加载速率和试件尺寸对数值试验结果影响甚微;偏应力随围压的增大呈线性增大;泊松比对数值试验结果影响较小;偏应力峰值随摩擦系数与剪切模量的增大接近于线性增大.

A contacting constitutive model was established and a biaxial numerical test method on graded broken stone（GBS）was proposed based on particle flow code.Influence laws of the numerical test were studied,and the reliability and practicality of the numerical test were verified.The results show that compared with displacement control mode,the results of the numerical test are more stable than that of strain rate control mode.When the value of loading rate is 0.5%·min^-1 and the size of specimen isΦ300 mm×h600 mm,the loading rate and size of specimens have little effect on the results of the numerical test.The deviatoric stress increases linearly with confining stress.Poisson＇s ratio has a little effect on the numerical test results.The peak point of deviatoric stress increases linearly with the increase of friction coefficient and shear modulus.