| 剪切带倾角尺度律与局部化启动跳跃稳定研究 |
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| 引用本文： | 王学滨,潘一山.剪切带倾角尺度律与局部化启动跳跃稳定研究[J].岩土力学,2002,23(4):446-449. |
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| 作者姓名： | 王学滨 潘一山 |
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| 作者单位： | 辽宁工程技术大学力学与工程科学系,辽宁,阜新,123000 |
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| 基金项目： | 辽宁工程技术大学校基金项目(编号:02-48) |
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| 摘 要： | 研究了剪切带倾角是如何依赖于岩样高度以及剪切带的不稳定性。建立了准脆性材料试件剪切带倾角尺度效应模型,得到了剪切带倾角尺度效应的解析解,且与实验结果比较相符。研究结果表明:剪切带倾角随着试件高度的增加而增加,但其增加幅逐渐减缓,最终趋于稳定值。笔者还对剪应变局部化启动、跳跃和稳定进行了理论分析,解释了实验所观测到的剪切带跳跃现象和砂岩岩样应变局部化较煤样滞后的原因。剪应变局部化是否发生跳跃,关键取决于全程应力-应变曲线软化段是否存在拐点。对于没有拐点的情形,宏观剪切带图案不跳跃。局部化是导致准脆性材料试件剪切带倾角尺度效应的原因。
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| 关 键 词： | 应变梯度 尺度效应 剪切带倾角 应变局部化 启动 跳跃 稳定 拐点 |
| 文章编号： | 1000-7598-(2002)04-0446-04 |
| 修稿时间： | 2001年8月21日 |
An analysis of size effect of the inclination angle of shear band and the onset, skip and stability of shear strain localization |
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| WANG Xue-bin,PAN Yi-shan.An analysis of size effect of the inclination angle of shear band and the onset, skip and stability of shear strain localization[J].Rock and Soil Mechanics,2002,23(4):446-449. |
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| Authors: | WANG Xue-bin PAN Yi-shan |
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| Abstract: | The focus of the paper is to in vestigate how the inclination angle of the shear band is dependent on the height of rock specimen and the instability of shear band.Based upon the gradient-dependent plasticity,a model of size effect of the inclination angle of the shear band was put forward.The theoretical result compares well with experimental results.The larger the height of the specimen,the larger the inclination angle of the shear band is.With the increment of the height,the velocity of increment becomes slow and gradually achieves a stable value.A theoretical analysis of the onset,skip and stability of shear strain localization was done;the phenomenon of the skip of shear strain localization was explained.Compared with the coal specimen,the reasons for lag of strain localization of sandstone specimen were explained and the reason is also given of the fact that the local strain of the sandy rock specimen lags behind the coal specimen.Whether the skip occurs or not,the flex point is a key factor in softening stage of complete stress-strain curve.If the curve has no flex point,then the skip of shear strain localization can not occur.Shear strain localization is the reasons for size effect of the inclination angle of shear band on the condition of uniaxial compression of quasibrittle materials. |
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| Keywords: | Key word:strain gradient size effect inclination angle of shear band strain localization onset skip stability flex point |
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