冲击载荷作用下土的疲劳损伤特性分析

发布时间：2018-07-04 14:03

本文选题：冲击荷载 + 锻锤基础系统　；参考：《水利学报》2014年05期

【摘要】：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。
[Abstract]:Fatigue failure is a very common physical phenomenon in engineering. The study of impact fatigue damage process of geotechnical engineering structures with the theory of continuous damage mechanics is of great significance for both the development of damage mechanics and the progress of geotechnical engineering theory. Because of the soil structure, many scholars at home and abroad have introduced the concept of "damage" in the constitutive model of soil. However, under cyclic load, there are few articles regarding soil failure as fatigue damage. Based on the numerical analysis of the impact fatigue damage of the forging hammer foundation system, the vertical response of foundation soil caused by single forging at different life stages (total forging times) is obtained. The average cumulative variation of micro-damage and the mechanism and evolution law of impact fatigue damage variable expressed by macroscopic average cumulative damage can be used as reference for the design of similar forging hammer foundation system.
【作者单位】：贵州省水利厅;浙江大学建筑工程学院;四川大学水力学与山区河流开发保护国家重点实验室水利水电学院;
【基金】：国家自然科学基金项目资助(50376046)
【分类号】：TU435

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