东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

基于次加载面理论改进的ALPHA模型及其数值实施

期刊名称：岩土力学, 已录用，待刊
时间：0
分类：TU44[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212003, [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071, [3]大连理工大学土木水利学院岩土工程研究所,大连116024, [4]大连理工大学海岸和近海工程国家重点实验室,大连116024
相关基金：国家自然科学基金重点项目（No.50639010）;国家自然科学基金项目（No.50509023）.
相关项目：复杂条件下大型港口、海洋结构物地基失稳机理及评价方法研究

关键词： ALPHA模型, 次加载面模型, 半隐式本构积分算法, Abaqus, ALPF model, subloading surface theory, semi-implicit constitutive integration algorithm, ABAQUS

中文摘要：

基于次加载面理论对ALPHA模型进行了改进，并在模型中考虑了土体初始各向异性；提出了与模型相适应的半隐式本构积分算法，据此在通用有限元软件ABAQUS平台上开发了相应的用户材料子程序；利用建立的计算程序，对不同排k条件的三轴试验进行了数值模拟。与已有研究成果对比表明，提出的半隐式本构积分算法，可较好地实现复杂本构模型的生值实施。改进的本构模型克服了修正剑桥模型预测的超固结土峰值强度过高、初始屈服面内假定为弹性变形等缺点，能够车好地描述土体初始屈服面内的的非线性和不可恢复性变形特征；通过变化模型参数，可模拟变形特性较为复杂的土体。

英文摘要：

APHA model is modified based on subloading surface theory; and the initial anisotropy induced by settlement is also considered. Cnsidering the characters of the modified model, a semi-implicit constitutive integration algorithm is proposed. In terms of the algorith, a user material subroutine is developed in the framework of general-purpose finite element code ABAQUS. Using the subroutinesimulations for triaxial tests are performed; and the results have been compared with the published studies. The comparison shis that the presented algorithms are capable of the numerically implementing of complicated constitutive model; and the modified A~HA model, which overcomes the deficiencies of modified Cam-Clay model, such as predicting higher peak strength for over consolated clay and assuming elastic deformation inside the initial yield surface, can depict the nonlinear and nonrecoverable dormation before yielding. Through varying model parameters, more complicated deformation behaviors can be simulated by the ridified model.