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首页> 外文会议>Pan-American conference on unsaturated soils >First Saturation and Resaturation of High Capacity Tensiometers with 1.5 MPa High Air Entry Value (HAEV) Ceramic Filters
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First Saturation and Resaturation of High Capacity Tensiometers with 1.5 MPa High Air Entry Value (HAEV) Ceramic Filters

机译：具有1.5MPa高空气入口值（HEEV）陶瓷过滤器的高容量张力计的首次饱和度和饱和度

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摘要

High capacity tensiometers, or HCTs, are sensors that can measure negative pore water pressures (soil suctions) between -1.5 and -2 MPa. To achieve such measured values, HCTs first need to be fully saturated by water. For the first saturation of an initially dry HCT, the most common procedure involves application of vacuum followed by forced flooding by pressurised water. Instead, for the resaturation of a HCT that has cavitated (and is therefore still water flooded), only application of water pressure is necessary. Typically, the procedures for the first saturation and resaturation of HCTs can last days or weeks, which hinders adoption of these devices by the geotechnical industry. In this paper, faster procedures are presented for both first saturation and resaturation of HCTs built with 1.5 MPa air entry value filters. The duration of the first saturation can be reduced to less than 24 h if high vacuum is first applied to the ceramic filter followed by water pressurisation at about twice the air entry value of the filter. Even more, resaturation of a cavitated HCT can be achieved in less than 10min by simple water pressurisation of the ceramic filter. This is however true only if the HCT is not left to dry out to the atmosphere completely and is submerged in water just after cavitation.
机译：高容量张力计或HCT，是可以测量-1.5和-2MPa之间的负孔隙水压力（土壤粘液）的传感器。为了获得这种测量值，HCTS首先需要用水完全饱和。对于最初干燥的HCT的第一次饱和，最常见的方法涉及真空施加真空，然后通过加压水强制淹没。相反，对于已经存在的HCT（因此仍然有水）的HCT的饱和度，仅需要施加水压力。通常，第一次饱和度和HCT的饱和程序可以持续时间或几周，阻碍了岩土工业通过这些设备。本文介绍了具有1.5 MPa空气入口滤波器的第一次饱和度和HCT的饱和度，更快地提供了更快的程序。如果首先将高真空施加到陶瓷过滤器，然后在过滤器的空气进入值下的水进入水中，则第一饱和度的持续时间可以降低至小于24h。如此，通过简单的陶瓷过滤器的简单水压，可以在小于10分钟内实现有空分的HCT的饱和度。然而，只有当HCT仍然没有完全干燥并且在水中后浸没在水中时，就才真实。

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