中文核心期刊
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中国科技核心期刊
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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2020, Vol. 39 ›› Issue (09): 127-131.DOI: 10.3969/j.issn.1674-0696.2020.09.18

• 港口航道·水利水电·资源环境 • 上一篇    下一篇

基于电阻率试验的真空饱水-干燥循环砂岩性能分析

何叶1,2，赵明阶1，汪魁1，吉跃辉1   

  1. (1. 重庆交通大学 水工建筑物健康诊断技术重庆市高校工程研究中心，重庆 400074； 2. 湖南城市学院 土木工程学院，湖南 益阳 413000)
  • 收稿日期:2019-10-17 修回日期:2020-06-29 出版日期:2020-09-18 发布日期:2020-09-22
  • 作者简介:何叶（1984—），女，湖南益阳人，博士研究生，主要从事水工结构与岩土基础的研究。E-mail:heye.1984@163.com
  • 基金资助:
    国家自然科学基金项目（51609027）；重庆市研究生科研创新项目（CYB16110）

Performance of Alternate Vacuum Saturation and Drying Cycles of Sandstone Based on Electrical Resistivity Test

HE Ye1,2, ZHAO Mingjie1, WANG Kui1, JI Yuehui1   

  1. (1. Hydraulic Building Health Diagnostic Technology Chongqing University Engineering Research Center, Chongqing Jiaotong University, Chongqing 400074, China; 2. School of Civil Engineering, Hunan City University, Yiyang 413000, Hunan, China)
  • Received:2019-10-17 Revised:2020-06-29 Online:2020-09-18 Published:2020-09-22

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摘要： 针对三峡库区的典型砂岩开展了试验研究，考虑到水位周期性变化的特点，对砂岩试件分别进行了循环次数n=0（自然状态）、1、3、5、9及13的真空饱水-干燥循环作用；分别测试循环后砂岩试件饱水状态及干燥状态的电阻率，并对饱水状态试件进行了物理、力学性能试验，分析了砂岩试件饱水电阻率Res和干燥电阻率Red随着真空饱水-干燥循环次数n变化的规律，对比了饱水电阻率Res、孔隙率P、饱和含水率ws、单轴抗压强度σc、弹性模量E与n的相关关系；结合饱水砂岩试件的SEM结果，分析了砂岩试件的电阻率与其物理、力学性能指标及微观特征之间的相关性。结果表明：自然状态砂岩试件经过1次饱水作用后，饱水电阻率Res下降了81.6%；Res随着n的增加而增大，增长趋势相对稳定；n从5增加到9时，干燥电阻率Red呈跳跃式增大，而n=5～9时，SEM图显示砂岩试件内部有明显裂隙出现；与Res相比，Red变化幅度更大；当n=5时，砂岩试件的Res、P、ws、σc、E均出现了特征点，且Res与P、ws随着n变化的规律基本相同，表明Res可以作为分析真空饱水-干燥循环砂岩宏-微观特性的有效指标。

关键词: 岩土工程, 真空饱水-干燥循环, 电阻率, 孔隙率, 宏-微观特征

Abstract: Considering the characteristics of periodic changes of water level, the test study on typical sandstone in the Three Gorges reservoir area was carried out. Firstly, six groups of sandstone specimens were subjected to alternate vacuum saturation and drying cycling, when the vacuum saturation and drying cycles n was 0 (natural state), 1, 3, 5, 9 and 13 respectively. Secondly, the electrical resistivity test was carried out on each group of saturated or dry sandstone specimens, and the saturated specimens were subjected to physical and mechanical tests. The variation rule of saturation electrical resistivity Res and drying electrical resistivity Red of sandstone specimens changing with the vacuum saturation and drying cycles n was analyzed. The correlation among Res, porosity P, saturated water content ws, uniaxial compressive strength σc, elastic modulus E and n were studied. Finally, combined with the SEM results of saturated sandstone specimens, the correlation between electrical resistivity and physical, mechanical performance indexes, as well as microscopic characteristics was analyzed. The results show that: after one time of water saturation of sandstone specimens at natural state, the saturated electrical resistivity Res decreases by 81.6%, and Res increases with the increase of n, and the growth trend is relatively stable. When n increases from 5 to 9, the dry electrical resistivity Red increases a leaping manner, and when n is in the range from 5 to 9, cracks in the sandstone specimens can be found from the SEM images. Compared with Res, Red changes more greatly. When n equals 5, Res, P, ws, σc, and E of sandstone specimens all have characteristic points. Moreover, the variation rule of Res, P, and ws changing with n are basically the same, which indicates that Res can be used as an effective index for analyzing the macro-micro characteristics of alternate vacuum saturation and drying cycle sandstone.

Key words: geotechnical engineering, alternate vacuum saturation and drying cycles, electrical resistivity, porosity, macro-micro characteristics

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