通过三轴试验,本文针对邓肯—张模型对砂卵石土的适用性进行了分析研究。试验结果表明,砂卵石土的体变在经历初始的体缩段后,随着轴向应变增加变为以体胀为主,并且随着围压增大,体胀逐渐减弱;砂卵石土的强度和切线弹性模量可以根据邓肯—张模型来较合理地确定;邓肯—张模型不能够较好地描述砂卵石土的体变特性与泊松比参数,切线泊松比应优选本文所拟合公式。 Through triaxial test, this paper analyzes the applicability of Duncan-Chang model to sandy pebble soil. The test results show that the body deformation of sandy pebble soils changes with the increase of axial strain to that of body expansion after the initial deformation, and the body inflation gradually decreases with the increase of confining pressure. The strength and tangent elastic modulus can be more reasonably determined according to the Duncan-Chang model. The Duncan-Zhang model can not describe the body-building behavior and Poisson’s ratio of sand-pebble soils better. Formula.