用微波炉快速测定黄土含水率最佳烘干时间的确定
|
摘要
以往现场测定黄土含水率的方法主要有烘干法、酒精灼烧发、比重计法、碳酸钙气压法等。微波炉的出现给含水率测定带来新的途径。微波炉烘干是否破坏了有机质,测试数据是否有效,最佳烘干时间是多少成为不可逾越的问题。笔者以延安地区黄土及红黏土为研究对象,采用微波炉烘干和常规实验室烘箱烘干方法,对比了不同烘干时间的土样含水率,确定了土样含水率达到稳定时的烘干时间。结果表明:微波炉烘干达到10min后,其结果与烘箱烘干法一致,方法有效;微波炉设定高火力,延安马兰黄土(Q~(p3))烘干时间为7min,离石黄土(Q~(p2))烘干时间为8min,对新近系N2b-j组红粘土烘干时间为10min;与烘箱烘干法相比,波炉烘干法可现场测试,省去了送样和和长时间烘烤时间,显著提高了工作效率,可作为工程施工及地质调查现场快速测定含水率的方法。
The drying method is a commonly used method in the determination of loess moisture content.The laboratory uses oven drying method.At the engineering site,the microwave ovens are commonly used for drying in order to save time.There is no uniform standard for the best time to dry in a microwave oven.In this paper,the drying of loess and red clay in Yanan area has been carried out by microwave oven.The moisture content of soil samples with different drying time has been compared,and then the drying time for the moisture content of soil samples reached stability has been determined.The results show that,when the microwave oven is set to high firepower,the drying time is 7 minutes for Yanan Q3 loess,8 minutes for Q2 loess,and 10 minutes for red clay in N2b-j group.This result can be used as a reference for rapid determination of moisture content of loess and red clay at the site of engineering construction and geological survey.
The drying method is a commonly used method in the determination of loess moisture content.The laboratory uses oven drying method.At the engineering site,the microwave ovens are commonly used for drying in order to save time.There is no uniform standard for the best time to dry in a microwave oven.In this paper,the drying of loess and red clay in Yanan area has been carried out by microwave oven.The moisture content of soil samples with different drying time has been compared,and then the drying time for the moisture content of soil samples reached stability has been determined.The results show that,when the microwave oven is set to high firepower,the drying time is 7 minutes for Yanan Q3 loess,8 minutes for Q2 loess,and 10 minutes for red clay in N2b-j group.This result can be used as a reference for rapid determination of moisture content of loess and red clay at the site of engineering construction and geological survey.
引文
邢鲜丽,李同录,李萍,等.黄土抗剪强度与含水率的变化规律[J].水文地质工程地质,2014,41(3):54-59.XING Xianli,LI Tonglu,LI ping,et al.Variation regularities of loess shear strength with the moisture content[J].Hydrogeology and Engineering Geology,2014,41(3):54-59.
边加敏,王保田.含水量对非饱和土抗剪强度影响研究[J].人民黄河,2010,32(11):124-125.BIAN Jiamin,WANG Baotian.Study on Influence of Moisture Content to the Shearing Resistance of Unsaturated Soil[J].Yellow River,2010,32(11):124-125.
南京水利科学研究院.GB/T 50123-1999土工试验方法标准[S].北京:中国计划出版社,1999.Nanjing Hydraulic Research Institute.GB/T 50123-1999Standard for soil test method[S].Beijing:China Planning Press,1999.
张虎元,张秋霞,李敏.微波炉法测定遗址土含水率的可靠性研究[J].岩土力学,2012,33(2):65-70.ZHANG Huyuan,ZHANG Qiuxia,LI Min.Reliability research of soil moisture content measurement by microwave oven drying method for earthen monuments[J].Rock and Soil Mechanics,2012,33(2):65-70.
李祯祥,赵寿刚.用微波炉测定土含水量的比较试验[J].防渗技术,2000,6(3):5-10.LI Zhenxiang,ZHAO Shougang.Comparative Experiment of Measuring the Moisture Content of Soil with Microwave Furnace[J].Technique of Seepage Control,2000,6(3):5-10.
聂良佐.微波炉法快速测试土的含水率[J].安全与环境工程,2007,14(2):105-107.NIE Liangzuo.Research and Application of Quick Measurement of Soil's Water Content with Microwave Oven Method[J].Safety and Environmental Engineering,2007,14(2):105-107.
王建华,李永江,王伟.微波炉烘干法快速测试土的含水率指标的试验研究[J].水电能源科学,2009,27(6):63-65.WANG Jianhua,LI Yongjiang,WANG Wei.Study on Rapid Testing Soil Water Content Using Microwave Oven Method[J].Water Resources and Power,2009,27(6):63-65.
王铁行,罗小锋,刘小军.考虑含水率影响的非饱和原状黄土冻融强度试验研究[J].岩土力学,2010,31(8):2378-2382.WANG Tiexing,LUO Xiaofeng,LIU Xiaojun.Testing study of freezing-thawing strength of unsaturated undisturbed loess considering influence of moisture content[J].Rock and Soil Mechanics,2010,31(8):2378-2382.
ASTM.D4643-00Standard test method for determination of water(moisture)content of soil by the microwave oven heating[S].Philadelphia American Society of Testing and Materials,2008.
PAUL A G.Rapid water content by computer-controlled microwave drying[J].Geotech.Engrg.,1991,117(1):118-138.
HAGERTY D J,ULLRICH C R,DENTON MM.Microwave drying of soils[J].Geotechnical Testing Journal,1990,13(2):138-141.
边加敏,王保田.含水量对非饱和土抗剪强度影响研究[J].人民黄河,2010,32(11):124-125.BIAN Jiamin,WANG Baotian.Study on Influence of Moisture Content to the Shearing Resistance of Unsaturated Soil[J].Yellow River,2010,32(11):124-125.
南京水利科学研究院.GB/T 50123-1999土工试验方法标准[S].北京:中国计划出版社,1999.Nanjing Hydraulic Research Institute.GB/T 50123-1999Standard for soil test method[S].Beijing:China Planning Press,1999.
张虎元,张秋霞,李敏.微波炉法测定遗址土含水率的可靠性研究[J].岩土力学,2012,33(2):65-70.ZHANG Huyuan,ZHANG Qiuxia,LI Min.Reliability research of soil moisture content measurement by microwave oven drying method for earthen monuments[J].Rock and Soil Mechanics,2012,33(2):65-70.
李祯祥,赵寿刚.用微波炉测定土含水量的比较试验[J].防渗技术,2000,6(3):5-10.LI Zhenxiang,ZHAO Shougang.Comparative Experiment of Measuring the Moisture Content of Soil with Microwave Furnace[J].Technique of Seepage Control,2000,6(3):5-10.
聂良佐.微波炉法快速测试土的含水率[J].安全与环境工程,2007,14(2):105-107.NIE Liangzuo.Research and Application of Quick Measurement of Soil's Water Content with Microwave Oven Method[J].Safety and Environmental Engineering,2007,14(2):105-107.
王建华,李永江,王伟.微波炉烘干法快速测试土的含水率指标的试验研究[J].水电能源科学,2009,27(6):63-65.WANG Jianhua,LI Yongjiang,WANG Wei.Study on Rapid Testing Soil Water Content Using Microwave Oven Method[J].Water Resources and Power,2009,27(6):63-65.
王铁行,罗小锋,刘小军.考虑含水率影响的非饱和原状黄土冻融强度试验研究[J].岩土力学,2010,31(8):2378-2382.WANG Tiexing,LUO Xiaofeng,LIU Xiaojun.Testing study of freezing-thawing strength of unsaturated undisturbed loess considering influence of moisture content[J].Rock and Soil Mechanics,2010,31(8):2378-2382.
ASTM.D4643-00Standard test method for determination of water(moisture)content of soil by the microwave oven heating[S].Philadelphia American Society of Testing and Materials,2008.
PAUL A G.Rapid water content by computer-controlled microwave drying[J].Geotech.Engrg.,1991,117(1):118-138.
HAGERTY D J,ULLRICH C R,DENTON MM.Microwave drying of soils[J].Geotechnical Testing Journal,1990,13(2):138-141.