| 两种卸荷路径下泥岩流变特性试验研究 |
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| 引用本文： | 任青阳,张黄梅,刘佳申.两种卸荷路径下泥岩流变特性试验研究[J].岩土力学,2019,40(Z1):127-134. |
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| 作者姓名： | 任青阳 张黄梅 刘佳申 |
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| 作者单位： | 1. 重庆交通大学 土木工程学院，重庆 400074；2. 武汉地铁集团有限公司，湖北 武汉 430000 |
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| 基金项目： | 国家重点研发计划重点专项子课题（No.2016YFC0802206-3）；国家自然科学基金项目（No. 41472262） |
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| 摘 要： | 分析岩石流变特性对边坡长期变形稳定性具有十分重要的意义。以贵州省某高速公路为背景，在施工现场取样，设计了恒轴压卸围压与等比例卸围压和轴压两种应力路径下的分级卸荷流变试验。试验结果表明，两种应力路径下泥岩岩样卸荷流变趋势大体一致，破坏应力下岩样的侧向变形迅速增长并超过了轴向变形，侧向扩容较显著；对比恒轴压卸荷，等比例卸荷历时较长，岩样轴向变形虽出现了回弹，但轴向变形量和侧向变形量所占全变形的比例较大，约为恒轴压卸荷的2倍，说明等比例卸载围压和卸轴压应力路径下岩样破坏可预见性更小，但其破坏影响更大。等比例卸荷实验参照实际边坡开挖坡度选取比例设计实验，对实际边坡工程长期稳定性分析极具参考价值。
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| 关 键 词： | 恒轴压卸荷 等比例卸荷 流变 |
| 收稿时间： | 2018-11-17 |
Rheological properties of mudstone under two unloading paths in experiments |
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| REN Qing-yang,ZHANG Huang-mei,LIU Jia-shen.Rheological properties of mudstone under two unloading paths in experiments[J].Rock and Soil Mechanics,2019,40(Z1):127-134. |
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| Authors: | REN Qing-yang ZHANG Huang-mei LIU Jia-shen |
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| Institution: | 1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Wuhan Metro Group Co., Ltd., Wuhan, Hubei 430000, China |
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| Abstract: | The rheological properties of rock are of great significance to the analysis of long-term deformation and stability of slopes. Based on the sampling of construction site at a highway in Guizhou province, the graded unloading rheological tests under two stress paths including constant axial stress and unloading confining pressure, and equal proportional unloading of confining pressure and axial stress were designed. The test results show that under the two stress paths, the rheological trend of the mudstone specimen under unloading is basically the same. Under the failure stress, the lateral deformation of the mudstone sample increases rapidly and it exceeds the axial deformation, and the lateral expansion is more significant. Compared with the constant axial stress unloading condition, the equal proportional unloading requires a much longer time, and the axial deformation of the mudstone sample rebounds. However, axial and lateral deformation account for a large proportion of the total deformation, which is about twice of that in unloading of constant axial stress. It shows that under the equal proportional unloading of confining pressure and axial stress, the predictability in failure of rock sample is smaller, but its damage effect is much greater. The proportional design experiment refers to the actual slope excavation gradient is designed to carry out the proportional unloading test, which has great reference for the long-term stability analysis of the actual slope engineering. |
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| Keywords: | constant axial stress unloading equal proportional unloading rheology |
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