Influence of drying-wetting cycles and soaking conditions on the shear creep characteristics of sandstone joints  

作　　者：GAO Yingchao WU Qiang WEI Wei JIANG Qinghui JIANG Shu ZHANG Chunshun DONG Jie 

机构地区：[1]School of Civil Engineering,Wuhan University,Wuhan 430072,China [2]School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China [3]School of Remote Sensing and Information Engineering,Wuhan University,Wuhan 430079,China

出　　处：《Journal of Mountain Science》2025年第4期1462-1481,共20页山地科学学报(英文)

基　　金：financial support from the National Natural Science Foundation of China(Grant Nos.52479108,52408391);the Fundamental Research Funds for the Central Universities(2042024kf0032);the Postdoctoral Fellowship Program(Grade C)of China Postdoctoral Science Foundation(Grant No.GZC20241283);the Natural Science Foundation of Hubei Province,China(No.2024AFB160)。

摘　　要：Numerous slope failures have been reported during periods of water level fluctuations.Understanding the influence of water on the creep behavior of joints is essential for evaluating the long-term stability of slopes.This study focuses on the effects of drying-wetting cycles and soaking conditions on the long-term behavior of sandstone joints.A total of 12 multi-stage shear creep tests are carried out on sandstone joints subjected to varying drying-wetting cycles under both soaking and un-soaking conditions.Based on the experimental results,the influences of drying-wetting cycles as well as soaking conditions on the microstructure,shear creep displacement,strength,and failure morphologies of sandstone joints are investigated comprehensively.Results indicate that increasing drying-wetting cycles not only yields larger shear creep displacements but also leads to a negative exponential decrease in the strength of sandstone joints.Besides,soaking conditions strongly influence the creep behavior of sandstone joints.The failure strength and long-term strength of sandstone joints for soaked samples decrease by 13.6%–29.0%and 19.4%–37.5%,respectively,as compared to unsoaked samples.Furthermore,four distinct stages in the shear creep process were identified according to the results obtained from multi-stage shear creep tests and computerized tomography scans,and three creep failure modes of sandstone joints are thus determined.Finally,the influence mechanism of drying-wetting cycles and soaking conditions on the creep failure modes of sandstone joints is revealed.Drying-wetting cycles and soaking conditions diminish the influence of asperities on the shear creep behavior of joints,thereby reducing the resistance of joints to long-term deformation.

关 键 词：Drying-wetting cycles Soaking conditions Shear creep Sandstone joints Computerized tomography 

分 类 号：TU45[建筑科学—岩土工程]