| 断层周围的弹塑性区及其地质意义 |
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| 关键词:fault nonlinear stress-strain relationship plastic region equivalent stress yield stress |
| 基金项目:国家自然科学基金项目(19972064)，国土资源部资助项目(991005) |
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| The Elastic-Plastic Region around Faults and Its Geological Significance |
| Using the finite element method, this paper has studied the stress field and elastic and plastic regions around faults in different orientations under slowly loaded two dimensional pressure. The results are as follows : ①In the case of plastic or ductile deformation, conjugate shear angle of the deformation belts is usually larger than 45°;② Under the above mentioned condition there are no tensile stresses near the tip of faults, but stretch deformation is likely to occur;③Near the end of faults to be inclined at 30°～90°,especially at 60°or so to maximum principal stress,there are zones of deviatoric stress concentration. In these directions it is easier to form new shear deformation and fracture belts;④ In areas on both sides of faults and within the interior of faults, stresses are usually lower than the regional stress. In these regions the state of lower stress is favorable for the migration, accumulation and precipitation of mineral liquids and oil gas. |
| WU Hong-ling,ZHANG Li-rong.2002.The Elastic-Plastic Region around Faults and Its Geological Significance[J].Acta Geoscientica Sinica,23(1):11-16. |
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