土的弹塑性模型缺陷分析及改进探讨

发布时间：2018-12-06 16:14

【摘要】：针对传统弹塑性模型的塑性势面用于岩土材料时的两个固有缺陷,提出了塑性势面区域的概念和连续渐变塑性势面模型的构想,连续渐变塑性势面模型的优点就在于塑性势面的连续和渐变,连续使得在任何屈服面外侧的应力路径下均是一系列连续的塑性势面在起作用,不会出现一个塑性势面单独发挥作用的情况,从而避免了传统弹塑性模型仅有一个塑性势面发挥作用时不能反映塑性应变增量方向与应力增量有关的缺陷;渐变使得屈服面处的塑性势面产生塑性变形的能力为0,且越接近屈服面的塑性势面产生塑性变形的能力越小,无限接近屈服面的塑性势面产生塑性变形的能力无限接近于0,从而解决了传统弹塑性模型屈服面两侧变形不连续的问题,将传统弹塑性模型发展成为连续渐变塑性势面模型,既能弥补传统弹塑性模型描述土体性质时的缺陷,又不将弹塑性理论全盘抛弃,是对传统弹塑性理论的继承发展。
[Abstract]:In view of the two inherent defects of the plastic potential surface of the traditional elastoplastic model used in geotechnical materials, the concept of the plastic potential surface region and the concept of a continuous progressive plastic potential surface model are proposed. The advantage of the continuous progressive plastic potential surface model lies in the continuity and gradual variation of the plastic potential surface, which makes a series of continuous plastic potential surfaces work under any stress path outside the yield surface. There will not be a single plastic potential surface acting on each other, thus avoiding the defects that the traditional elastic-plastic model can not reflect the direction of plastic strain increment and stress increment when only one plastic potential surface is used. The ability of the plastic potential surface at the yield surface to produce plastic deformation is 0, and the ability of the plastic potential surface near the yield surface to produce plastic deformation is smaller, and the ability of the plastic potential surface which is infinitely close to the yield surface to produce plastic deformation is infinitely close to zero. Thus the problem of discontinuous deformation on both sides of the yield surface of traditional elastoplastic model is solved. The traditional elastoplastic model is developed into a continuous gradual plastic potential surface model, which can remedy the defects of the traditional elastoplastic model in describing the properties of soil. It is the inheritance and development of the traditional elastoplastic theory that the elastoplastic theory is not completely abandoned.
【作者单位】：常州工学院常州市建设工程结构与材料性能研究重点实验室;
【基金】：国家自然科学基金项目(51479052,51678083,41302226) 江苏省六大人才高峰项目(JZ-011) 江苏高校品牌专业建设工程一期项目(PPZY2015A041) 湖南科技大学岩土工程稳定控制及健康监测湖南省重点实验室开放基金项目(E21620) 江苏省高校“青蓝工程”资助江苏省高校优秀中青年教师和校长境外研修计划资助
【分类号】：TV223

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