论文部分内容阅读
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。
Aiming at the two inherent defects of the traditional plastic-plastic model for geotechnical materials, the concept of plastic potential area and the conception of continuous graded plastic potential model are proposed. The advantage of continuous graded plastic potential model lies in the plasticity Continuity and gradual change of the potential surface continuously make a series of continuous plastic potential surfaces work under any stress path outside of the yield surface, so that a plastic potential surface will not appear alone, thus avoiding the traditional elasto-plasticity When only one plastic potential surface is working, the model can not reflect the defects related to the incremental direction of the plastic strain and the increment of stress. The gradual change makes the plastic potential at the yield surface have the ability of plastic deformation as 0, and the plastic potential closer to the yield surface The smaller the capacity of plastic deformation of the surface, the plastic deformation potential infinitely close to the yield surface plastic deformation infinitely close to 0, so as to solve the problem of deformation discontinuities on both sides of the yield surface of the traditional elasto-plastic model, the traditional elasto-plastic model development Become a continuous gradient plastic potential surface model, both to make up for the traditional elasto-plastic model describes the nature of soil defects, without the elastoplastic theory Disk abandon, it is the inheritance and development of traditional elastic-plastic theory.