关键词: 道路工程;蠕变特性;三轴蠕变试验;浇注式沥青混凝土;热力耦合

Abstract: In order to further research the triaxial creep properties of bituminous mixture of gussasphalt concrete under the effect of temperature and stress coupling , MTS815 testing machine was adopted to carry out triaxial creep test under circumstance of different temperatures , different stress levels and confining pressures , and the corresponding creep curves were obtained , and generalizes the modified Burgers model to three dimensional form in order to describe the creep constitutive relation of gussasphalt concrete .The results show that the first phase of creep curve of gussasphalt concrete is not obvious ,which reflects that the internal void ratio is lower .The creep deformation value sharply increases with the rise of temperature and the increase of deviatoric stress level , which reflects that the combined action of high temperature heavy load is a decisive factor of the rutting on asphalt concrete pavement .The creep deformation slightly decreases with the increase of confining pressure , and the confining pressure has inhibitory effect on creep deformation .The creep rule got from the triaxial creep test , compared with uniaxial creep test , is more able to reflect the deformation law in the process of actual load ,and three-dimensional and modified Burgers model can accurately reflect the creep properties of bituminous mixture of gussasphalt concrete under the effect of temperature and stress coupling .

Key words: road engineering;creep property;triaxial creep test;gussasphalt concrete;thermal mechanical coupling