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测定非饱和土土-水特征曲线的溢出水校正称量法
引用本文:陈辉,韦昌富,李幻,曹华峰,吴二林.测定非饱和土土-水特征曲线的溢出水校正称量法[J].岩土力学,2010,31(7):2141-2145.
作者姓名:陈辉  韦昌富  李幻  曹华峰  吴二林
作者单位:1. 中国科学院岩土力学研究所,岩土力学与工程国家重点试验室,武汉,430071;江西蓝天学院,南昌,330098
2. 中国科学院岩土力学研究所,岩土力学与工程国家重点试验室,武汉,430071
基金项目:中国科学院武汉岩土力学研究所领域前沿基础研究基金资助项目,国家自然科学基金资助项目,岩土力学与工程国家重点实验室重点项目,中国科学院百人计划择优支持项目 
摘    要:在利用压力板仪测定非饱和土的土-水特征曲线时,常用的取样称量法、溢出水称量法分别存在实测试样质量与实际试样质量不相等、实测排水量与实际排水量不相等等问题,从而造成试验结果失真。为此,溢出水校正称量法被引入用来消除取样称量法及溢出水称量法中存在的问题。通过取样称量法、溢出水称量法、溢出水校正称量法的对比研究发现,在同一基质吸力作用下,由取样称量法、溢出水称量法确定的试样饱和度均小于由溢出水校正称量法确定的试样饱和度,并对该现象进行了解释。随后,对取样称量法、溢出水称量法、溢出水校正称量法的适用范围进行了探讨。

关 键 词:压力板仪  土-水特征曲线  取样称量法  溢出水称量法  溢出水校正称量法
收稿时间:2009-09-03

A modified weighing-outflow method for measuring soil-water characteristic curve of unsaturated soils
CHEN Hui,WEI Chang-fu,LI Huan,CAO Hua-feng,WU Er-lin.A modified weighing-outflow method for measuring soil-water characteristic curve of unsaturated soils[J].Rock and Soil Mechanics,2010,31(7):2141-2145.
Authors:CHEN Hui  WEI Chang-fu  LI Huan  CAO Hua-feng  WU Er-lin
Institution:1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China ; 2. Jiangxi Bluesky University, Nanchang 330098, China
Abstract:Usually, two methods are adopted in using the pressure plate extractor, namely, including the weighing soil method(WSM), which measures the water content by weighing the soil sample when equilibrium is reached; and the weighing outflow method(WOM), which measures the water content by weighing the outflow from the soil sample after equilibrium is attained. In the measurement, however, there are some factors that can adversely influence testing results. For example, with the WSM, part of soil mass may lose, and in using the WOM, the outflow could be overestimated because the air-bubble accumulation and the air-water interface. All these factors may result in error. To resolve the problem, an adjusted method of weighing ouflow is introduced. By comparing the weighing soil method and the weighing outflow method to the adjusted method of weighing outflow, it is shown that at the same matric suction, the saturations determined with the weighing soil method and the weighing outflow method are less than that determined with the adjusted method of weighing outflow. The reasons for this are sought; and the applicabilities of these three methods are discussed.
Keywords:pressure plate extractor  soil water characteristic curve  weighing soil method  weighing outflow method  adjusted weighing outflow method
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