| 张黎明*,王在泉,李华峰,孙辉.粉砂岩峰后破坏区应力脆性跌落的试验和本构方程研究[J].实验力学,2008,23(3):234~240 |
| 粉砂岩峰后破坏区应力脆性跌落的试验和本构方程研究 |
| Theoretical and Experimental Study on Siltstone Brittle Stress Drop in Post-Failure Region |
| 投稿时间：2007-07-15 修订日期：2008-04-11 |
| DOI： |
| 中文关键词: 破坏后区 脆塑性 应力脆性跌落 |
| 英文关键词:post-failure region brittle-plasticity brittle stress drop |
| 基金项目:国家自然科学基金资助项目（50674059）；山东省教育厅资助项目（J07YB01） |
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| 中文摘要: |
| 对粉砂岩试样进行常规三轴压缩试验，得到了其在不同围压下的应力－应变全程曲线。结果表明，岩样应力-应变曲线峰前（破坏前区）部分的力学性质较为稳定，其力学行为可用经典强度理论进行描述；应力-应变曲线峰后（破坏后区）部分，岩样处于非稳定状态，其力学行为难以用经典强度理论来描述，而脆塑性模型恰好可以描述试验岩样的应力非连续变化特征。岩石的应力脆性跌落是有条件发生的，应力脆性跌落系数是围压的函数，并给出应力脆性跌落系数与围压的关系。对完整岩样而言，使用弹性－线性软化－残余塑性三线性非理想脆塑性模型可以描述岩样的本构特征，而对含有节理岩样而言，采用双线性弹性－线性软化－残余塑性四线型非理想脆塑性模型与试验更为相符。 |
| 英文摘要: |
| Complete stress-strain curve of siltstone specimens under different confining pressures were obtained through conventional tri-axes compression tests. Results show that the pre-failure region of specimens represents a stable mechanical response, which is well defined by classic strength principle. However, the post-failure region of specimens represents an instable mechanical response, which is difficult to describe by classic strength principle. To a turn, it can be described by brittle-plastic model. Results show that the coefficient of brittle stress drop is a function of the confining pressure. Relation function between the brittle stress drop and the confining pressure of siltstone was obtained. For intact siltstone, the linear elastic-linear strain softening-residual plastic model is well adapted. For jointed siltstone specimens, the bilinear elastic-linear strain softening-residual plastic model is even better adapted. |
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