Strain-softening composite damage model of rock under thermal environment
| Autor: | Chunsheng Qiao, Ming-yuan Yu, Shuang-jian Niu, Feng Wenlin, Tan Wang, Zi-qi Jia |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Deformation (mechanics)
business.industry Geothermal energy Constitutive equation 0211 other engineering and technologies Geology 02 engineering and technology Energy consumption 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Physics::Geophysics Nonlinear system Residual stress Tangent modulus Energy transformation Geotechnical engineering business 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Bulletin of Engineering Geology and the Environment. 79:4321-4333 |
| ISSN: | 1435-9537 1435-9529 |
| DOI: | 10.1007/s10064-020-01808-9 |
| Popis: | To ensure the safe and effective application of deep geotechnical engineering, it is necessary to establish a suitable constitutive model of the rocks in thermal environment, including geothermal energy mining, and deep geological treatment of nuclear waste and tunnel fire. A strain-softening damage model of the rocks with defect growth is established based on damage evolution. According to the change in the tangent modulus from the compression phase to the elastic stage, we established a constitutive model reflecting the nonlinearity characteristics of the compression phase. According to the change in the energy conversion, the energy consumption coefficient is introduced to describe the deformation characteristics of the rocks when the residual stress is reached. The specific physical meaning and the calculation method of the energy consumption coefficient are given to correct the shortcomings of the evolution of the damage variable. We then analyzed the relationship between parameters in the constitutive model of the rocks at high temperature and normal temperature. Based on the constitutive model of the rocks at normal temperature, we established a constitutive model reflecting the influence of high temperature. Finally, the established model fit the stress-strain curves of several kinds of the rocks at different temperatures and generated desired results. The established model can be used to describe the stress-strain curve characteristics of the rocks at different temperatures. |
| Databáze: | OpenAIRE |
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