Experimental research on expansive deformation of tertiary red sandstone in Nanjing

ZHU Zhen-de; XING Fu-dong; LIU Han-long; ZHANG Yong

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Experimental research on expansive deformation of tertiary red sandstone in Nanjing

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- Experimental research on expansive deformation of tertiary red sandstone in Nanjing
- Vol. 25, Issue 7期　刊出日, (2004)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU458+.3
- Online First：18 July 2014，
  
  Published：2004
- 稿件说明：
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ZHU Zhen-de, XING Fu-dong, LIU Han-long, et al. Experimental research on expansive deformation of tertiary red sandstone in Nanjing[J]. 2004, 25(7期　刊出日).
DOI：

ZHU Zhen-de, XING Fu-dong, LIU Han-long, et al. Experimental research on expansive deformation of tertiary red sandstone in Nanjing[J]. 2004, 25(7期　刊出日). DOI：

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。

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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