文献类型：期刊文献

英文题名：Water absorption/dehydration by NMR and mechanical response for weakly cemented mudstones subjected to different humidity conditions

作者：Wang, Shuai Han, Lijun Meng, Qingbin Jin, Yuhao Zhao, Weisheng

第一作者：Wang, Shuai

通信作者：Han, LJ[1]

机构：[1]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;[2]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China

通信机构：corresponding author), China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China.

年份：2020

卷号：79

期号：3

起止页码：1275-1288

外文期刊名：BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT

收录：;EI(收录号：20194607686515);Scopus(收录号：2-s2.0-85074850526);WOS:【SCI-EXPANDED(收录号:WOS:000495057200002)】；

基金：This study was supported by the National Natural Science Foundation of China (Nos. 51574223 and 51704280), Guizhou Science and Technology Support Plan Project (GZSCCB, No. [2018]1061), and Guizhou Provincial Department of Education Youth Science and Technology Talent Growth Support Project (GZSCC No. [2017]219).

语种：英文

外文关键词：Weakly cemented mudstone; Water adsorption; dehydration; NMR; Mechanical properties

摘要：Mudstones of Bayanhua Formation are characterized by high porosity, large content of swelling clay minerals, and weak cementation due to its late diagenesis in Wujianfang Basin, eastern Inner Mongolia, China. Mechanical properties heavily deteriorate during water absorption or dehydration, resulting in underground engineering instability. To study water absorption/dehydration and mechanical response for weakly cemented mudstones, two sets of weathering routes, namely, higher relative humidity (RHs) and lower RHs, are performed by using a self-developed weathering instrument, which can achieve environmental control and real-time weight measurement. The water migration is logged by nuclear magnetic resonance (NMR). Finally, uniaxial compression tests are carried out on weathered samples to study their mechanical properties. The results show that dehydration occurs even under the 70% RH condition, due to their higher initial water content of more than 10%, and the dehydration content is exponential over time under the 60% RH condition. Variations of T-2 spectrum reflect the water migration when the surrounding humidity changes. The maximum peak of the transverse relaxation time (T-2) moves left during dehydration and shifts to the right when adsorbing water. The uniaxial compressive strength (UCS) does not increase with the decreasing RH at any time, which is distinct from elasticity modulus (E). There is a critical RH at 50%, indicating that damages accumulate when the RH is lower than 50%. Tensile fracture occurs for the most types of weathered samples, and shear failure only occurs under the drying condition.