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疲劳失效是发生在工程领域中的一类十分普遍的物理现象,用连续损伤力学理论研究岩土工程结构的冲击疲劳损伤过程不论对损伤力学研究发展还是岩土工程理论进步都有创新意义。由于土具有结构性,所以国内外有很多学者在土的本构模型中都引入了“损伤”的概念。但是,在循环荷载作用下,将土的破坏视为疲劳损伤破坏的文章尚不多见。通过对锻锤基础系统的冲击疲劳损伤数值分析,得到了锻锤基础系统在不同寿命阶段(总锻打次数下)单次锻打引起地基土竖向响应、微损伤平均累积变化量以及用宏观平均累积损伤表示的冲击疲劳损伤变量的机理和演变规律,可供类似锻锤基础系统设计时参考。
Fatigue failure is a kind of very common physical phenomenon that takes place in the field of engineering. It is of great significance to study the impact fatigue damage process of the geotechnical engineering structure by the theory of continuous damage mechanics, both for the development of damage mechanics and the theory of geotechnical engineering. Due to the structural nature of soil, many scholars at home and abroad have introduced the concept of “damage” into the constitutive model of soil. However, under the action of cyclic loading, it is rare to see the destruction of soil as the damage of fatigue damage. Through the numerical analysis of the impact fatigue damage of the forging hammer foundation system, the vertical response of the foundation soil caused by single forging in different life stages (total number of forging) is obtained, and the average cumulative change of micro damage is obtained. The mechanism and evolution rule of the impact fatigue damage variable which is indicated by the average cumulative damage can be used as a reference for design of a similar hammer foundation system.