堆石料Wang-Wu亚塑性本构模型参数求取的改进

Improved method to parameters of the rockfill Wang-Wu hypoplastic model

研究Wang-Wu提出的亚塑性模型,并指出该模型应用在堆石料时存在的不足.推导了模型参数的求取方法,建立了参数与围压之间的关系,提出了新的模型参数.通过堆石料大型侧限压缩试验、大型三轴排水试验、邓肯E-B模型和改进的沈珠江双屈服面模型,反演其他围压的试验值并进行对比验证.所得成果表明,提出的7个新参数有效地解决该模型应用到堆石体材料时遇到的确定参数的难题,有利于将该模型推广到堆石体材料工程.

The Wang-Wu hypoplastic model was studied and its defect of the model used in rockfill materials was pointed out. According to the derivation of the model parameters equation,the relationship between the parameters and the confining pressure was established and the new model parameters were proposed. The method was verified by means of rockfill oedometric test,rockfill triaxial consolidated drained test,Duncan E-B model inversion test and modified Shen Zhujiang＇s double-yield surface model inversion test. It was shown that the proposed seven new parameters could effectively solve the problem of determining the parameters when the model was introduced into the rockfill materials,and it is helpful for the model to be extended to the rockfill material engineerings.