| 不同卸荷速度条件下灰岩力学特性的试验研究 |
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| 引用本文： | 王在泉,张黎明,孙辉,张迎晖,匡顺勇.不同卸荷速度条件下灰岩力学特性的试验研究[J].岩土力学,2011,32(4):1045-1050. |
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| 作者姓名： | 王在泉 张黎明 孙辉 张迎晖 匡顺勇 |
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| 作者单位： | 青岛理工大学,理学院,山东,青岛,266033 |
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| 基金项目： | 国家自然科学基金资助项目，山东省自然科学基金资助项目，山东省教育厅资助项目 |
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| 摘 要： | 对灰岩试样进行加轴压、卸围压破坏试验,研究了不同卸围压速度下灰岩的变形特征和力学参数变化,取得了一些新的结论:卸荷岩样的破坏是沿卸荷方向的强烈扩容所致;随着卸荷速度的增加,岩样的破坏特征从主剪切破坏、共轭剪切破坏逐渐变为劈裂加剪切破坏;在相同的卸荷初始围压下,卸围压速度越快,岩样破坏的应力差越小;在相同的卸荷速度下,随着卸荷初始围压的增加,岩样破坏的应力差逐渐增加;在相同的卸荷速度下,卸荷初始围压越大,轴向应变的回弹值愈大,环向应变突跳值愈小;随着卸荷速度的增加,岩样黏聚力c逐渐增加,内摩擦角Φ逐渐减小。
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| 关 键 词： | 卸荷 石灰岩 力学参数 变形特征 |
| 收稿时间： | 2009-11-24 |
Experimental study of mechanical properties of limestone under different unloading velocities |
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| WANG Zai-quan,ZHANG Li-ming,SUN Hui,ZHANG Ying-hui,KUANG Shun-yong.Experimental study of mechanical properties of limestone under different unloading velocities[J].Rock and Soil Mechanics,2011,32(4):1045-1050. |
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| Authors: | WANG Zai-quan ZHANG Li-ming SUN Hui ZHANG Ying-hui KUANG Shun-yong |
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| Institution: | College of Science, Qingdao Technological University, Qingdao, Shandong 266033, China |
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| Abstract: | The deformation features,mechanical parameters and failure characteristics were obtained based on the results of triaxial unloading tests of limestone.It is shown that the evolution of volumetric strain is determined by lateral strain under unloading condition.Failure modes of rock could be classified into three types: primary shear failure,conjugate shear failure and splitting-shear failure.The failure stress difference decreases with unloading velocity increasing under the same initial confining pressure.... |
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| Keywords: | unloading limestone mechanical parameters deformation characteristics |
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