| 南京红山窑第三系红砂岩膨胀变形性质试验研究 |
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| 引用本文： | 朱珍德,邢福东,刘汉龙,张勇.南京红山窑第三系红砂岩膨胀变形性质试验研究[J].岩土力学,2004,25(7):1041-1044. |
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| 作者姓名： | 朱珍德 邢福东 刘汉龙 张勇 |
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| 作者单位： | 1.中国科学院武汉岩土力学研究所 岩土力学重点实验室，湖北 武汉 430071；2.河海大学 岩土工程研究所，江苏 南京 210098 |
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| 基金项目： | 中科院武汉岩土力学研究所岩土力学国家重点开放科学基金项目(Z110306)，河海大学科技创新基金项目(2001401743) |
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| 摘 要： | 针对原状红砂岩具有自由膨胀率为3.5 %、而膨胀力高达270 kPa、干燥岩样峰值强度为5.85 MPa、饱和岩样抗压强度仅为0.20 MPa等这些特殊性质的膨胀岩，采用MTS815.02型岩石力学刚性伺服试验机与自行研制的岩石膨胀测量仪，进行了不同含水率红砂岩膨胀变形性质试验。结果表明：(1) 在低荷载状态下，红砂岩膨胀应变随着含水率增加而呈对数形增长；(2) 在高荷载作用下，红砂岩膨胀应变与吸水率之间存在着线性关系；(3) 红砂岩吸水膨胀应变在较短的时间内基本完成，随着时间的延长，膨胀变形将趋于稳定。在此基础上，提出了确定膨胀稳定时间的理想概化数学模型。研究成果对南京红山窑水利工程膨胀岩地基处理方案设计、施工具有重要的指导意义。
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| 关 键 词： | 红砂岩 膨胀变形 含水率 试验 |
| 文章编号： | 1000-7598-(2004)07-1041-04 |
| 收稿时间： | 2003-09-22 |
| 修稿时间： | 2003年9月22日 |
Experimental research on expansive deformation of tertiary red sandstone in Nanjing |
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| ZHU Zhen-de,XING Fu-dong,LIU Han-long,ZHANG Yong.Experimental research on expansive deformation of tertiary red sandstone in Nanjing[J].Rock and Soil Mechanics,2004,25(7):1041-1044. |
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| Authors: | ZHU Zhen-de XING Fu-dong LIU Han-long ZHANG Yong |
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| Institution: | 1. Key Lab of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | For the reason of special expansive characteristics of red sandstone, a series of experimental procedure performed in rock mechanics rigidity servo testing system (RMTS815.02) and rock oedometer, developed to determine the swelling behaviour of red sandstone taken from a foundation pit of Hongshanyao Project (HSYP) in Nanjing, is described. Based on the experimental data, an empirical formula of expansive strain with water content was expressed as . It is clear that the curve of expansive strain-water content is a logarithm. In the meantime, the relation of expansive strain with time was studied and the importance of expansive stabilization time was illuminated. The experimental results indicated that the water content has a tremendous effect on peak expansive and steady expansive deformation of swelling red sandstone; and it must be a momentous guide in the engineering design and construction. |
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| Keywords: | red sandstone expansive deformation water content experiment |
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