摘要
为了研究粘土的各向异性对孔压生成的影响,在修正剑桥模型的基础上,采用关口-太田应力比概念、结合邢义川-郑颖人方程,构造了一个各向异性旋转屈服面,建立了一个各向异性弹塑性本构模型;据此推导出一个各向异性孔压表达式,该式可以考虑Lode角以及主应力轴的平面旋转对孔压的影响;并采用新的孔压表达式着重分析了三轴应力状态下Lode角旋转以及主应力轴旋转所造成的孔压发展,并对条形荷载下的平面应变各向异性粘土地基中的孔压发展进行了计算。计算结果表明,地基中由于Lode角旋转造成的孔压不明显,但在荷载边角位置主应力轴旋转造成的孔压不容忽视,尤其是在埋深相对较浅的位置。
The effect of anisotropy on the pore pressure development for clay is investigated. A rotational yield surface is presented by introducing the Sekiguchi-Ohta stress ratio and Xin＇s failure equation into the Modified Cam Model; and an anisotropic elastoplastic model is built. Based on this model, a new anisotropic pore pressure equation is presented, which can account for the pore pressure development induced by the rotation of Lode angle and principal stress. The equation is used to study the pore pressure development induced by the rotation of the Lode angle and stress axis direction under triaxial stress state. Finally, the pore pressure development in the plane strain anisotropic clay foundation under an strip load is analyzed by the equation. Results show that the pore pressure induced by the Lode angle rotation is small in the foundation. However, in the soil under the edge of load, pore pressure induced by the rotation of stress axis direction is significant, especially at a lower depth.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第9期1349-1355,共7页
Rock and Soil Mechanics
基金
上海市重点学科建设项目资助(沪教委科[2001]44号)。
关键词
土
各向异性
孔压公式
本构模型
clay
anisotropy
pore pressure equation
constitutive model
