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Based on the study of fracture toughness II of frozen soil, the application of fracture toughness II is firstly used in undisturbed frozen soil in this paper. Because of undisturbed soil not vibrated and microstructures inside of the soil body not change, it is more realistic and more meaningful than remolded soil in laboratory. In the research, bend test stand was improved at first time, and drawing...
Based on the previous undisturbed frozen field test, the research and analysis on the Size effect of fracture toughness KIC of vertical crack and herringbone crack of undisturbed frozen soils specimens of test I is performed emphatically, and it is found the rules that it varies with volume change. Meanwhile, a theoretical prediction by using the Gray System Theory methods is made and the theoretical...
Referenced the fracture mechanics theories, based on the consideration of the destruction characteristics, the cementation force of ice in the frozen soil and fictitious crack, the wing crack fracture model of base layer of reservoir slope is proposed. The calculated results of finite element analysis agree with soil mechanics experimental results in terms of the soil mass of base layer of reservoir...
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