压力板仪排水通道中气溶水对吸力测试影响的理论修正  

Theoretical Correction to the Effect of Air Dissolved in Water inDrainage Channel of Pressure Plate on Matric Suction Measurement

作　　者：刘军定[1] 李荣建[1] 王磊 孙萍[3] 张世斌[1] LIU Jun-ding;LI Rong-jian;WANG Lei;SUN Ping;ZHANG Shi-bin(Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China;School of Architectural Engineering, Yan’an University, Yan’an 716000, China;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China)

机构地区：[1]西安理工大学岩土工程研究所,西安710048 [2]延安大学建筑工程学院,陕西延安716000 [3]中国地质科学院地质力学研究所,北京100081

出　　处：《长江科学院院报》2020年第3期178-182,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(41472296);陕西省黄土力学与工程重点实验室项目(14JS064);中国地质调查项目(DD20190717)。

摘　　要：为了得到更为精准的土-水特征曲线,基于压力板仪测定基质吸力的原理,首先分析了测试过程中的主要影响因素,指出了空气在水中的溶解对试验结果造成的影响,在测量土-水特征曲线时应合理考虑空气在水中的溶解对试验造成的影响;然后依据空气在水中的溶解度,确定了排水通道内水中溶解空气的体积,修正了陶土板底部气泡体积的测量值;最后依据修正后的陶土板底部气泡体积,提出了土体试样中体积含水率的修正公式,从而可以得到更为合理的土-水特征曲线。此分析方法为得到更为精准的土-水特征曲线提供了一种探索思路。The aim of this study is to obtain a more accurate soil-water characteristic curve(SWCC).First of all,major influential factors in the process of measuring matric suction by pressure plate are analyzed.Air dissolution in water is identified to have influence on the test result,which should be taken into consideration in measuring the SWCC.According to the solubility of air in water,the volume of dissolved air in water in the drainage channel is determined,and the measured value of bubble volume at the bottom of clay plate is corrected.On the basis of this corrected bubble volume,a correction formula for the volumetric water content in soil sample is proposed to acquire a more reasonable SWCC.

关 键 词：土-水特征曲线 压力板仪 基质吸力 溶解度 排水通道 

分 类 号：TU411[建筑科学—岩土工程]