| 砂岩加卸载条件下能耗特征试验研究 |
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| 引用本文： | 许国安,牛双建,靖洪文,杨圣奇,王文龙.砂岩加卸载条件下能耗特征试验研究[J].岩土力学,2011,32(12):3611-3617. |
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| 作者姓名： | 许国安 牛双建 靖洪文 杨圣奇 王文龙 |
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| 作者单位： | 1.中国矿业大学 深部岩土力学与地下工程国家重点试验室，江苏 徐州 221008；2.中国矿业大学 力学与建筑工程学院，江苏 徐州 221116 |
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| 基金项目： | 国家自然科学基金项目，国家十一五科技支撑计划，江苏省土木工程研究生科技创新基金 |
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| 摘 要： | 采用MTS815刚性伺服试验机，对砂岩进行了单轴、三轴压缩和三轴峰后卸围压试验，对比研究了砂岩在加卸载试验条件下的能耗特征。结果表明，单轴压缩各能耗指标值均小于三轴压缩和三轴峰后卸围压，三轴峰后卸围压介于单轴与三轴压缩之间。三轴压缩和三轴峰后卸围压各能耗指标均具有明显的围压效应，随着围压的升高而线性增大。单轴压缩时砂岩表现为突发性的脆性破坏，初期储存的弹性应变能瞬间几乎全部转化为耗散能，成为岩样破坏时所表现出的一切现象的源动力；三轴压缩时砂岩表现为从局部破坏到整体失稳的渐进过程，耗散能所占吸收能量的比例越来越大，表现为明显的能量耗散，能量耗散发展到一定程度表现为明显的能量释放，随即岩石整体失稳破坏。
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| 关 键 词： | 应力路径 能量耗散 能量释放 三轴压缩 峰后卸围压 |
| 收稿时间： | 2010-07-05 |
Experimental study of energy features of sandstone under loading and unloading |
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| XU Guo-an,NIU Shuang-jian,JING Hong-wen,YANG Sheng-qi,WANG Wen-long.Experimental study of energy features of sandstone under loading and unloading[J].Rock and Soil Mechanics,2011,32(12):3611-3617. |
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| Authors: | XU Guo-an NIU Shuang-jian JING Hong-wen YANG Sheng-qi WANG Wen-long |
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| Institution: | 1. State Key Laboratory for Geomechanics ? Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; 2. School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China |
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| Abstract: | In order to get the features of energy absorption and dissipation of sandstone under loading and unloading,the tests of uniaxial compression,triaxial compression and post-peak unloading confining pressure have been performed on sandstone with the MTS81.5 servo-controlled test machine.The results show that the dissipated energy of sandstone increases from uniaxial compression test through post-peak unloading test to triaxial compression test.The dissipated energy in triaxial compression and post-peak unloadi... |
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| Keywords: | stress paths energy dissipation energy release triaxial compression post-peak unloading confining pressure |
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