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首页> 外文会议>International Symposium on Geotechnical Measurements and Modelling; Sep 23-25, 2003; Karlsruhe, Germany >The use of a relative humidity sensor for suction measurement of compacted bentonite-sand mixtures
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The use of a relative humidity sensor for suction measurement of compacted bentonite-sand mixtures

机译：相对湿度传感器用于压实膨润土-砂混合物的吸力测量

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摘要

Compacted bentonite-sand mixtures have been widely used as barrier material in many applications, such as in waste disposal systems. As they are commonly unsaturated in the field, suction can be used as a measure to characterise the material condition in situ in addition to water content, dry density and coefficient of permeability that are commonly adopted in general practise. Measurement of suction, in this case, total suction, poses great challenges for geotechnical engineers due to incapability and inaccuracy of available methods in measuring the whole range of suction that may occur in the field. This paper presents an alternative means for suction measurement by which almost the whole range of suction encountered in the field can be quantified indirectly. A commercially available relative humidity sensor is used to determine relative humidity of the material such that the corresponding suction can be calculated. The sensor was used to measure total suctions of two bentonite-sand mixtures compacted to standard and enhanced proctor densities. It is shown that satisfactory results can be obtained and a range within which the sensor is likely to be most applicable is proposed.
机译：压实的膨润土-沙混合物在许多应用中，例如在废物处理系统中，已被广泛用作阻挡材料。由于它们在该领域中通常是不饱和的，因此除一般实践中通常采用的水含量，干密度和渗透系数外，吸力还可以用作表征原位材料状况的一种措施。吸力的测量，在这种情况下，是总吸力，由于在现场可能无法测量整个吸力范围的可用方法的能力和准确性而给岩土工程师带来了巨大的挑战。本文提出了一种用于吸力测量的替代方法，通过该方法，可以间接量化现场遇到的几乎所有吸力范围。使用可商购的相对湿度传感器来确定材料的相对湿度，以便可以计算出相应的吸力。该传感器用于测量两种膨润土-砂混合物的总吸力，这些混合物压实至标准密度并提高了检举人的密度。结果表明，可以获得令人满意的结果，并且提出了传感器最可能适用的范围。

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