排水过程三轴试样含水率分布演化规律研究

马德良; 谢一飞; 冯怀平; 李腾; 常建梅

doi:10.11779/CJGE202208007

排水过程三轴试样含水率分布演化规律研究 English Version

马德良^{1, 2,},
谢一飞^{1, 2},
冯怀平^{1, 2, ,},
李腾^{1, 2},
常建梅^{1, 2}

1.
石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室, 河北石家庄 050043
2.
石家庄铁道大学河北省交通工程结构力学行为演变与控制重点实验室, 河北石家庄 050043

基金项目:

国家自然科学基金项目 51478279

中央引导地方项目 216Z1805G

详细信息

作者简介:
马德良(1990—)，男，博士研究生，主要从事非饱和土测量设备的研发工作。E-mail: madeliang@stdu.edu.cn

通讯作者:
冯怀平，E-mail: fenghuaiping@stdu.edu.cn

中图分类号: TU43
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- 文章访问数: 204
- HTML全文浏览量: 37
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出版历程
- 收稿日期: 2022-01-04
- 网络出版日期: 2022-09-22
- 刊出日期: 2022-07-31

Development of moisture content distribution of triaxial samples during drying process

MA De-liang^{1, 2,},
XIE Yi-fei^{1, 2},
FENG Huai-ping^{1, 2, ,},
LI Teng^{1, 2},
CHANG Jian-mei^{1, 2}

1.
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2.
Key Laboratory of Mechanical Behavior Evolution and Control of Traffic Engineering Structures in Hebei, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

摘要

摘要: 三轴试验过程中试样含水率分布实时测试对吸力平衡判断、剪切速率确定和湿化变形等研究具有重要意义。通过扩展范德堡电阻率测试理论（vdP），提出了柱状土体含水率测试理论；在此基础上，研发一种厚度仅为0.1 mm的柔性印刷电极及配套的范德堡法集成测试装置。通过设计围压与温度敏感性因素试验，验证装置兼容性和可靠性。最后开展了恒压状态下的三轴干湿循环试验，并对试验过程中试样分层电阻率进行监测。试验结果表明，本套试验装置需要至少120 kPa静围压预压，以保证电极与试样完全贴合；同时试验全程静围压不低于20 kPa以保持电极紧密贴合。温度对电阻率测试精度具有一定的影响，Campbell模型可以有效修正温度带来的测试误差。浸水过程中，试样电阻率从下至上依次降低；排水过程中，试样电阻率由顶到底逐渐降低；最后提出了脱湿过程的试样分层含水率计算方法并且分析了含水率分布演化规律。
- 非饱和土 /
- 含水率分布 /
- 范德堡法 /
- 三轴试样
Abstract: The real-time measurement of moisture content distribution in the triaxial tests is significant to suction balance, shear rate and wetting deformation. The principle of water content tests on triaxial samples is proposed by extending van der Pauw (vdP) resistivity theory. Moreover, the flexible printing electrode (FPE) with 0.1 mm in thickness and the vdP method device are developed. The compatibility and reliability of the device are verified through the sensitivity factor tests such as net confining pressure and temperature. Finally, the triaxial drying-wetting cycle tests under constant pressure are carried out. At the same time, the layered resistivity is monitored. The test results show that the test device needs the preloading of net confining pressure of at least 120 kPa to ensure the complete cover between the FPE and the samples, and the net confining pressure shall be more than 20 kPa to ensure the cover status in the tests. The temperature has a certain influence on the results of resistivity tests, and the Campbell model can effectively correct the temperature-introduced errors. In the process of moisture wetting, the resistivity decreasing from bottom to top can be observed dramatically. In the process of drying, the resistivity decreases gradually from top to bottom. Finally, the method for calculating the layered moisture content during drying process is proposed, and the evolution law of moisture content distribution is analyzed.
- unsaturated soil /
- moisture content distribution /
- van der Pauw method /
- triaxial sample

HTML全文

图 1 电阻率测量误差随高度变化曲线

Figure 1. Measurement errors of resistivity with various heights

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图 2 粒径级配曲线

Figure 2. Grain-size distribution curves

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图 3 非饱和三轴仪改装示意图

Figure 3. Schematic diagram of modified unsaturated triaxial device

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图 4 柔性印刷电极

Figure 4. Flexible printing electrode

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图 5 电阻率测试盒

Figure 5. Integration resistivity device

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图 6 印刷电极与电缆连接

Figure 6. PFC connection between FPE and cable

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图 7 净围压加载路径

Figure 7. Loading paths of net confining pressure

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图 8 基质吸力调整示意图

Figure 8. Schematic diagram of matrix suction

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图 9 体变、净围压与电阻率随时间变化曲线

Figure 9. Curves of resistivity, volumetric change and net confining pressure with time

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图 10 试验结束后柔性电极状态

Figure 10. FPE status at end of tests

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图 11 电阻率与温度变化曲线

Figure 11. Curves of resistivity with various temperatures

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图 12 电阻率与修正后温度拟合

Figure 12. Fitting results between resistivity and correction temperature

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图 13 循环一中各层电阻率变化趋势

Figure 13. Tendency of resistivity of each layer in cycle I

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图 14 试样含水率沿高度分布图

Figure 14. Distribution of moisture content along height

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图 15 排水试验含水率分布随时间变化

Figure 15. Distribution of moisture content during drying process

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表 1 土的基本物理指标

Table 1 Basic physical properties of soil

土颗粒相对质量密度液限/% 塑限/% 最优含水率/% 最大干密度/( ${\text{g}} \cdot {\text{c}}{{\text{m}}^{{\text{ - 3}}}}$ )

2.71 24.3 15.8 12.4 1.78

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土颗粒相对质量密度	液限/%	塑限/%	最优含水率/%	最大干密度/( ${\text{g}} \cdot {\text{c}}{{\text{m}}^{{\text{ - 3}}}}$ )
2.71	24.3	15.8	12.4	1.78

排水过程三轴试样含水率分布演化规律研究 English Version

作者简介: 马德良(1990—)，男，博士研究生，主要从事非饱和土测量设备的研发工作。E-mail: madeliang@stdu.edu.cn

通讯作者: 冯怀平，E-mail: fenghuaiping@stdu.edu.cn

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Development of moisture content distribution of triaxial samples during drying process

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作者简介:
马德良(1990—)，男，博士研究生，主要从事非饱和土测量设备的研发工作。E-mail: madeliang@stdu.edu.cn

通讯作者:
冯怀平，E-mail: fenghuaiping@stdu.edu.cn