| 测定非饱和土水力参数的一步流动方法研究 |
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| 引用本文： | 伊盼盼,韦昌富,陈盼,马田田.测定非饱和土水力参数的一步流动方法研究[J].岩土力学,2012,33(4):1025-1030. |
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| 作者姓名： | 伊盼盼 韦昌富 陈盼 马田田 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071；2. 武昌理工学院，武汉 430223 |
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| 基金项目： | 国家自然科学基金(No.11072255,10872211);中国科学院方向性项目(No.kzcxz-yw-150);中国科学院“百人计划”择优项目资助 |
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| 摘 要： | 详细介绍了改进的常流速联合测试系统，该系统增加了气泡冲刷和量测装置，能够冲刷试验过程中溢出陶土板的气泡并测量气泡的体积，进而对溢出水量进行修正，使测量值更加接近于真值。使用该系统对试样进行一步脱湿、吸湿流动试验，得出溢出水量随时间变化的关系曲线，利用HYDRUS-1D水分运移模型对该曲线进行拟合并得出相关参数。根据这些参数，反算得出试样脱湿段和吸湿段的土-水特征曲线和渗透函数并和实测数据进行对比。结果表明，该方法能很好的拟合实测溢出水量随时间变化的关系曲线，通过模型得出的土-水特征曲线和实测值比较接近，证实了该方法的可靠性。并且，与传统的测试方法相比，该方法能够节约大量的时间。因此，通过一步流动试验测定非饱和土-水力学参数的方法是可行的。
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| 关 键 词： | 改进的常流速联合测试系统 HYDRUS-1D 一步流动试验 土-水特征曲线 渗透函数 |
| 收稿时间： | 2010-10-08 |
A one-step outflow method for measuring hydraulic parameters of unsaturated soils |
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| YI Pan-pan
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WEI Chang-fu
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CHEN Pan
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MA Tian-tian.A one-step outflow method for measuring hydraulic parameters of unsaturated soils[J].Rock and Soil Mechanics,2012,33(4):1025-1030. |
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| Authors: | YI Pan-pan WEI Chang-fu CHEN Pan MA Tian-tian |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics Chinese Academy of Sciences, Wuhan 430071, China; 2. Wuchang University of Technology, Wuhan 430223, China |
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| Abstract: | An improved combined system with constant flow method and additional equipment to scour and quantify the air bubbles is introduced in detail.In order to make the measurement closer to the true value,we can correct the overflow of water by measuring the volume of the air bubbles.The curves of outflow with time are observed from one-step drying and wetting outflow experiment.The parameters which are evaluated using the HYDRUS-1D software are used to determine the drying and wetting soil-water characteristic curve(SWCC) and the hydraulic conductivity function.By comparing the measured data,it is shown that the method can fit the observed curves of outflow with time correctly so as to verity the reliability of the method.The difference of SWCCS between the estimated and measured is small.In addition,comparing with the traditional methods,the method proposed enables experiments to complete in a short period of time.Therefore,the method proposed for determining hydraulic parameters of unsaturated soils by one-step outflow test is feasible. |
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| Keywords: | improved combined testing system with constant flow method HYDRUS-1D one-step outflow test soil-water characteristic curve hydraulic conductivity function |
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