| 黄土渗气系数原位测试原理方法及适用性试验研究 |
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| 引用本文： | 任宏玉,李喜安,张玉涛,李杰,薛泉.黄土渗气系数原位测试原理方法及适用性试验研究[J].工程地质学报(英文版),2022,30(2):347-356. |
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| 作者姓名： | 任宏玉 李喜安 张玉涛 李杰 薛泉 |
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| 作者单位： | ①.长安大学地质工程与测绘学院，西安 710054，中国 |
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| 摘 要： | 渗透系数是黄土渗透变形破坏及黄土水理性质相关研究中的一项重要参数,而渗气系数与渗透系数具有良好的相关性且其测试过程不受黄土水敏性的影响,同时比渗透系数测定更为方便和快捷,因此具有良好的推广应用前景.本文介绍了黄土原位渗气测试方法的原理,在此基础上针对插入式和接触式两种原位渗气测试方法,在不同地区黄土地层开展了一系列原位...
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| 关 键 词： | 渗气系数 原位试验 接触式 插入式 |
| 收稿时间： | 2021-05-16 |
EXPERIMENTAL STUDY ON PRINCIPLE,METHOD AND APPLICABILITY OF IN-SITU MEASUREMENT OF LOESS GAS PERMEABILITY COEFFI-CIENT |
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| REN Hongyu,LI Xi'an,ZHANG Yutao,LI Jie,XUE Quan.EXPERIMENTAL STUDY ON PRINCIPLE,METHOD AND APPLICABILITY OF IN-SITU MEASUREMENT OF LOESS GAS PERMEABILITY COEFFI-CIENT[J].Journal of Engineering Geology,2022,30(2):347-356. |
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| Authors: | REN Hongyu LI Xi'an ZHANG Yutao LI Jie XUE Quan |
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| Institution: | ①.School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China②.Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Xi'an 710054, China③.Chang' an University Huangtu Engineering Research Center, Xi'an 710054, China④.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The permeability coefficient is an important parameter in the study of loess seepage deformation and loess hydraulic properties. However,the gas permeability coefficient has a good correlation with the permeability coefficient,and water sensitivity of loess can not affect its testing process. At the same time,it is more convenient and faster than the determination of permeability coefficient. So it has a good prospect of popularization and application. This paper introduces the principle of loess in-situ gas permeability test method. On this basis,we carry a series of in-situ gas permeability tests in different loess areas by contact type and plug-in type. The test results show that the two methods have different application scopes for loess stratum. The plug-in method is more suitable when the clay content of loess is greater than 12.44%(the plasticity index is greater than 11.2). On the contrary,when the clay content is less than 12.44%(the plasticity index is less than 11.2),the plug-in method can cause larger errors. The comprehensive comparison shows the contact method is generally applicable to loess strata because of its less human error. But this method needs a larger working face and is more suitable for horizontal working face,which affects the test speed and convenience. The plug-in method needs a smaller working face,and is suitable for both horizontal and vertical working face. So it is more convenient and faster. However,the process of probe inserting into loess can cause disturbance,so this method is more suitable for loess layer with higher clay content. When the clay content of loess is greater than 12.44%(the plasticity index is greater than 11.2),we suggest to give priority to the plug-in method. If the site does not meet these conditions,we suggest to choose the contact method. The two determination methods of in-situ gas permeability coefficient of loess and their application scope provide a theoretical basis for further application in practice. |
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