不同应力路径下的邓肯–张模型模量公式

Tangent elastic modulus of Duncan-Chang model for different stress paths

实际工程中,土体可能处于轴向卸载、侧向加载、侧向卸载应力路径下,而邓肯–张模型是在轴向加载条件下得到的,这限制了它的适用范围。本文模拟邓肯—张模型思路推导了不同应力路径下的切线模量公式,从而使模量公式系列化,扩大了邓肯–张模型适用范围;根据不同应力路径试验的结果,发现公式推导中使用的假设可以得到验证。

In practical applications, the soil might be subjected to different stress paths, such as axial unloading lateral loading and lateral unloading. But the well-known Duncan-Chang model was derived only under the axial loading condition. Thus the scope of its application was restricted. It was attempted to further develop the Duncan-Chang model and to derive a formula of tangent elastic modulus under different stress paths. The new formula was verified for various problems which could not be well handled by the traditional Duncan-Chang model.