中文摘要：

原始邓肯—张模型基于Mohr-Coulomb强度准则和双曲线体变公式,不能考虑土体的中间主应力效应、剪胀性和受扰敏感性,影响了其适用范围和预测精度。现有对邓肯—张模型的改进仅针对某一方面,赵春风的修正邓肯—张模型考虑了中间主应力效应和剪胀性,但没有考虑砂土的受扰敏感性;徐日庆的砂土修正邓肯—张模型考虑了受扰敏感性,但没有考虑中间主应力效应和剪胀性。本文结合赵春风模型和徐日庆模型的优点,建立了考虑中间主应力、剪胀性和受扰敏感性等共同影响的砂土新邓肯—张模型,并探讨了该新模型的适用性,对实际岩土工程设计具有参考价值。

英文摘要：

The original Duncan-Chang model based on the Mohr-Coulomb strength criterion and the hyperbolic volume formula cannot consider the effects of intermediate principal stress,dilatancy and disturbance sensitivity,which affects its application scope and prediction accuracy.The existing improvements for Duncan-Chang model are only for some particular aspects.Zhao＇s improved model considers the effects of intermediate principal stress and dilatancy but did not consider disturbance sensitivity of sands,while Xu＇s model is completely opposite.This paper established a new Duncan-Chang model for sands by combining advantages of Zhao＇s model with Xu＇s model,which considers the intermediate principal stress,dilatancy and disturbance sensitivity effects,and the applicability of the new model is also discussed,which could provide a reference for practical geotechnical engineering design.