Water-induced softening behavior of clay-rich sandstone in Lanzhou Water Supply Project, China
文献类型：期刊论文
| 作者 | Azhar, Muhammad Usman2,3; Zhou, Hui2,3; Yang, Fanjie2,3; Younis, Adnan1; Lu, Xinjing4; Fang, Houguo4; Geng, Yijun4 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2020-06-01 |
| 卷号 | 12期号:3页码:557-570 |
| ISSN号 | 1674-7755 |
| 关键词 | Clay-rich sandstone Microscopic properties Micro-indentation test Elastic modulus Slake durability index |
| DOI | 10.1016/j.jrmge.2019.07.017 |
| 英文摘要 | The strength of clay-rich sandstone decreases significantly when in contact with water due to softening effects. This scenario can pose a severe threat to the stability of water diversion tunnels during construction and operation periods. To address the issues related to water-induced softening in clay-rich sandstone zones in a water diversion tunnel of Lanzhou Water Supply Project, the microscopic and micromechanical variations of rocks due to increasing water content in two different zones i.e. zones A and B, were determined by various testing methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), thin section microscopy, micro-indentation test, sonic velocity test, and slake durability test. The microscopic analysis confirms the presence of montmorillonite mineral which is the dominant problematic geomaterial in engineering application. The integrity and durability of clay-rich sandstone were determined with sonic velocity and slake durability tests to calibrate the results obtained by the micro-indentation test. It shows that the elastic modulus and hardness of clay-rich sandstone decrease with the increase of saturation time, up to 144 h, which is more significant and rapid during early stage of saturation. After 144 h of saturation, the elastic modulus decreases by 89% and 97%, and the hardness decreases by 89% and 99% for zones A and B sandstones, respectively. The results of slake durability and sonic velocity indicate that zone A sandstone remains 56.19% durability after 144 h of saturation, while zone B sandstone loses its durability merely after 72 h of saturation. The clay-rich sandstone starts to dissolve in water when the saturation time exceeds 144 h. The significant decreases in strength and durability of clay-rich sandstone due to water-induced softening are serious threats to tunnel stability. The improvements in the strength of surrounding rock mass by grouting and permeability by installation of drainage galleries can reduce the damage caused by water-induced softening. (C) 2020 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| 资助项目 | Chinese Academy of Sciences and the World Academy of Sciences (CASTWAS) ; National Key R&D Program of China[2018YFC0809601] ; National Key R&D Program of China[2018YFC0809600] ; Key projects of the Yalong River Joint Fund of the National Natural Science Foundation of China[U1865203] ; Hubei Province Natural Science Foundation Innovation Group[2018CFA013] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000540806700011 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/24338]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zhou, Hui |
| 作者单位 | 1.Univ Calgary, Dept Geosci, Calgary, AB, Canada 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 4.Yellow River Engn Consulting Co Ltd, Zhengzhou 450003, Peoples R China |
| 推荐引用方式 GB/T 7714 | Azhar, Muhammad Usman,Zhou, Hui,Yang, Fanjie,et al. Water-induced softening behavior of clay-rich sandstone in Lanzhou Water Supply Project, China[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2020,12(3):557-570. |
| APA | Azhar, Muhammad Usman.,Zhou, Hui.,Yang, Fanjie.,Younis, Adnan.,Lu, Xinjing.,...&Geng, Yijun.(2020).Water-induced softening behavior of clay-rich sandstone in Lanzhou Water Supply Project, China.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,12(3),557-570. |
| MLA | Azhar, Muhammad Usman,et al."Water-induced softening behavior of clay-rich sandstone in Lanzhou Water Supply Project, China".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 12.3(2020):557-570. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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