变形加固理论及高拱坝整体稳定与加固分析

DEFORMATION REINFORCEMENT THEORY AND GLOBAL STABILITY AND REINFORCEMENT OF HIGH ARCH DAMS

发展和完善了变形加固理论;提出结构失稳的严格定义及其集合逻辑表述,发展了基于塑性余能及其变分的结构稳定性判剧;完善了最小塑性余能原理的证明,指出它是结构平衡条件、变形协调条件和本构关系的集中体现。提出结构整体稳定性可以用结构整体安全度与塑性余能的关系曲线来描述的新思路,并应用于高拱坝整体稳定性评价。结果表明,变形加固理论为评价高拱坝的整体稳定性、坝踵开裂、坝趾锚固、断层加固等高拱坝关键技术问题提供了统一和实用的理论框架和基础。

Deformation reinforcement theory is developed and improved. The strict definition of structure failure and its logical description with set concept are presented. The criterion of structure stability based on plastic complementary energy and its variation is developed. The principle of minimum plastic complementary energy has been well proven. It is presented that the principle of minimum plastic complementary energy is the combination representation of structure equilibrium, coordination condition of deformation and constitutive relationship. The new idea that the structure global stability can be described by the relationship between the global degree of safety of structure and plastic complementary energy is presented; and then it is used in global stability evaluation of high arch dams. The results show that the deformation reinforcement theory provides uniform and practical theory framework and basis for high arch dams in evaluation of global stability, cracking problem of dam-heel, anchorage of dam-toe, reinforcement of faults and so on.