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Triaxial Compression Damage Model of Brittle Geotechnical Materials Based on Energy Dissipation Characteristics(PDF)


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Triaxial Compression Damage Model of Brittle Geotechnical Materials Based on Energy Dissipation Characteristics
LI Zhong-you1 YAO Zhi-hua2 HU Bai3
(1. 93055 Troops of PLA,Shenyang 110021, Liaoning, China; 2. Department of Airfield and Building Engineering, Air Force Engineering University, Xi'an 710038, Shaanxi, China; 3. Engineering and Environment Quality Supervision Department of Real Estate Administration of Chengdu Military Command, Chengdu 600041, Sichuan, China)
geotechnical material energy dissipation triaxial compression damage constitutive model
Starting from the characteristics of energy dissipation in the process of material deformation and failure, the brittle geotechnical material was considered to be a brittle elastic part with only damage energy dissipation and an ideal elastic-plastic part with only plastic flow energy dissipation. A damage constitutive model suitable to complex stress states such as triaxial compression was established. For the brittle elastic part, the research showed that both volume deformation and shear deformation could cause fracture damage of structural elements in materials, but the damage energy dissipation mechanisms were different, and they had different effects on mechanical properties and strength of materials. Therefore, from the point of view of energy dissipation, volume damage variable and shear damage variable were defined respectively. The incremental damage evolution equation was established based on the principle of energy conservation in deformation process. The damage mechanism of brittle geotechnical materials under complex stress state was further revealed. For the ideal elastic-plastic part, Mohr-Coulomb strength criterion was used to reflect the yield strength of materials. Taking the typical granite of Three Gorges underground power station as an example, the damage model presented was used for numerical calculation. The results show that the model can well predict the variation of peak strength, peak strain and residual strength with confining pressure during triaxial compression, and reflect the characteristics of material changing from brittleness to plasticity with increasing confining pressure. The model has wide application value in engineering.


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Last Update: 2019-07-26