A Method for Studying Fatigue Damage Judgment of Strain Hardened Soil Under Cyclic Dynamic Loading

Abstract

The invention discloses a method for studying fatigue damage judgment of strain-hardening soil under cyclic dynamic load, solves the problem of lack of judging method for soil strain hardening characteristic under cyclic dynamic load, and provides a parameter reflecting soil strain hardening ability under cyclic dynamic load , established the fatigue damage expression suitable for the three-dimensional stress state, based on the strain hardening characteristics, proposed the method of using the low cycle fatigue damage evolution model to determine the fatigue damage of strain hardened soil, and determined the fatigue damage evolution law of strain hardened soil under cyclic dynamic load and its influencing factors. The strain-hardening soil fatigue damage model established by the present invention, taking mud interlayer as an example, can lay a foundation for the study of the degradation mechanism of mud interlayer engineering properties under cyclic dynamic load disturbances such as natural earthquakes, blasting vibrations, and traffic loads, and provide a basis for effective prevention of dynamics. It provides a new approach to the instability and failure of complex rock slopes with muddy interlayers and dam foundations under load conditions.

Description

technical field [0001] The invention relates to the field of geotechnical engineering characteristic research, in particular to a method for studying fatigue damage judgment of strain hardened soil under cyclic dynamic load. Background technique [0002] In the theory of plasticity, strain hardening (work hardening) soil means that the stress of the soil increases with the increase of strain in the conventional compression test, but the rate of increase becomes slower and slower, and finally approaches an asymptote. The curvature of the stress-strain curve reflects the strain hardening ability of the soil. But so far there is no method that can directly reflect the strain hardening characteristics of soil under cyclic dynamic loading. The dynamic strength of strain-hardened soil under the action of cyclic dynamic load is in a certain dynamic stress state. In this dynamic stress state, a small dynamic stress increment can cause a large or indeterminate dynamic strain increme...

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Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a method for studying the fatigue damage judgment of strain-hardened soil under cyclic dynamic load, which can solve the problems in the existing research that do not involve the judgment method of soil strain-hardening characteristic under cyclic dynamic load, and can provide A parameter that reflects the strain hardening ability of soil under cyclic dynamic load, and can solve the problem of lack of fatigue damage expression suitable for the three-dimensional stress state in the existing research, so as to better realize the strain hardening soil under cyclic dynamic load Describe the evolution law of fatigue damage

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