| 基于应变梯度理论的韧性剪切带理论研究 |
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| 引用本文： | 王学滨,潘一山,马瑾.基于应变梯度理论的韧性剪切带理论研究[J].地质力学学报,2002,8(1):79-86. |
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| 作者姓名： | 王学滨 潘一山 马瑾 |
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| 作者单位： | 1. 辽宁工程技术大学力学系, 辽宁阜新 123000; |
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| 基金项目： | 中国地震局地质研究所构造物理开放实验室资助(编号:LTP0003) |
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| 摘 要： | 地质领域中存在的大量事实都可以归为应变局部化范畴,韧性剪切带是剪切应变局部化带。本文首次应用应变梯度塑性理论对韧性剪切带进行了理论分析。获得了韧性剪切带内部局部剪应变(率)分布规律,剪切带错动总位移及剪切带法向位移的理论表达式,以及韧性剪切带内部体积应变(率)和孔隙率分布规律。剪应变局部化导致了体积应变和孔隙率局部化。随着应变软化的加剧,剪应变、体积应变和孔隙率局部化加剧;随着应力率绝对值的增加,剪应变率、体积应变率集中程度增强。
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| 关 键 词： | 应变局部化 韧性剪切带 应变梯度塑性理论 剪应力(率) 体积应变(率) 空隙率 |
| 文章编号： | 1006-6616(2002)01-0079-08 |
| 收稿时间： | 2001/9/6 0:00:00 |
| 修稿时间： | 2001年9月6日 |
A THEORETICAL STUDY ON DUCTILE SHEARING BANDS BASED UPON STRAIN GRADIENT PLASTICITY THEORY |
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| WANG Xue-bin,PAN Yi-shan and MA jin.A THEORETICAL STUDY ON DUCTILE SHEARING BANDS BASED UPON STRAIN GRADIENT PLASTICITY THEORY[J].Journal of Geomechanics,2002,8(1):79-86. |
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| Authors: | WANG Xue-bin PAN Yi-shan and MA jin |
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| Institution: | 1. Dept. of Mechanics and Engineering Sciences, Liaoning Technical University, Fuxin 123000, China;2. Institude of Geology, China Seismological Bureau, Beijing 100029, China |
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| Abstract: | Many usual phenomena in the realm of geology can be seen as strain localization. Ductile shearing bands are shearing strain localization bands. In the first time, a theoretical study on ductile shearing bands based upon strain gradient plasticity theory is conducted in this paper. The regularities of the shear strain and the ratio of shear strain in the shearing bands are got. The theoretical formulas about the displacement of the shearing bands in the two perpendicular directions are obtained. Besides, the regularities of the volumetric strain and the ratio of volumetric strain in the shearing bands are also got. The strain localization causes volumetric strain localization and the localization of porosity factor. If the strain softening intensifies, the shear strain and the volumetric strain localization intensify. Along with the increase of absolute ratio of shear stress, the intensive extent of ratio of shear strain and volumetric strain intensifies. |
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| Keywords: | strain localization the ductile shearing bands strain gradient plasticity theory (the ratio of) shear strain (the ratio of) volumetric strain porosity factor |
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