| 孔隙水压力分级加载砂岩蠕变特性研究 |
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| 引用本文： | 杨红伟,许 江,彭守建,聂 闻.孔隙水压力分级加载砂岩蠕变特性研究[J].岩土力学,2015,36(Z2):365-370. |
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| 作者姓名： | 杨红伟 许 江 彭守建 聂 闻 |
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| 作者单位： | 1. 宜宾学院 矿业工程研究所，四川 宜宾 644007；2. 重庆大学 煤矿灾害动力学与控制国家重点试验室，重庆 400044 |
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| 基金项目： | 国家自然科学基金面上项目（No.51474040）；国家青年科学基金（No.51304255）；四川省教育厅创新团队项目（No.14TD0032）。 |
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| 摘 要： | 采用RLW－2000 M微机控制煤岩流变仪，以细粒砂岩为研究对象，对三轴压缩条件下岩石孔隙水压力分级加载蠕变试验进行了蠕变特性及模型研究，重点分析了孔隙水压力分级加载时蠕变条件下岩石的应变（应变速率）、等效孔隙体积（体积速率）演化曲线，同时对不同孔隙水压力分级加载条件下的岩石蠕变演化曲线进行了模型分析和对比。试验结果表明，逐级加载孔隙水压作用下细粒砂岩的蠕变曲线符合蠕变演化3阶段特征；分级加载水压力的孔隙体积演化规律符合微孔洞的损伤过程的3个阶段规律；利用西原体模型进行理论与试验蠕变曲线对比，蠕变方程曲线与试验曲线的演化规律吻合。
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| 关 键 词： | 砂岩 蠕变 分级加载 孔隙水压力 |
| 收稿时间： | 2014-10-03 |
Study of sandstone creep characteristics under stepwise
loading pore water pressures |
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| YANG Hong-wei,XU Jiang,PENG Shou-jian,NIE Wen.Study of sandstone creep characteristics under stepwise
loading pore water pressures[J].Rock and Soil Mechanics,2015,36(Z2):365-370. |
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| Authors: | YANG Hong-wei XU Jiang PENG Shou-jian NIE Wen |
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| Institution: | 1. Institute of Mining Enginering, Yibin University, Yibin, Sichuan 644007, China;
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China |
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| Abstract: | The studies of, creep and damage of fine sandstone under step loading of pore water pressure are carried out by triaxial compression creep tests using the coal and rock computer controlled rheological testing machine RLW-2000 M. The highlights include studies of volumetric strain(rate) and equivalent pore volume(rate) evolution curves of rock creep under different stepwise loadings of pore water pressure. In addition, evolutions of rock creep curves are analyzed. The results show that the creep curves are consistent with three stages in typical creep process. The evolutions of pore volume are consistent with three stages in damage process of the microholes under stepwise loading of pore water pressure. The theoretical analysis of creep curves by Nishihara model was validated by experiments. |
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| Keywords: | sandstone creep stepwise loading pore water pressure |
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