基于邓肯-张模型下砂卵石土固结排水剪切试验研究

Shearing Test and Drainage of Sandy Gravel Consolidation Based on Duncan-Chang Model

通过对邓肯-张模型对砂卵石土固结排水剪切试验分析研究表明,实际粗粒土的抗剪强度与法向应力之间的比例关系不是一个常数,抗剪强度包线并非一条直线,为了计算上的简便,通常用一条拟合最佳的直线来代替,而没有考虑强度包线的弯曲。虽说与邓肯-张模型下砂卵石抗剪强度包线为直线有一定的出入,但其强度和切线弹性模量可根据邓肯-张模型来合理确定。

The Duncan-Chang model was adopted to experimentally study the shear property and drainage of sandy gravel consolidation.The results show that,the ratio of the shear strength of coarse sandy gravel and normal force is not a constant.The shear strength envelope curve is not linear,thus an optimum fitting line is used to replace the strength envelope curve.The strength and normal modulus of elasticity can be determined by the Duncan-Chang model.