水化学腐蚀作用下泥岩力学性能与微结构劣化特征研究  

Study on mechanical properties and microstructure deterioration of mudstone under hydrochemical corrosion

作　　者：周凯凯 李振奇 Zhou Kaikai;Li Zhenqi(Hangzhou Water Resources and Hydropower Survey and Design Institute Co.,Ltd.,Hangzhou 310000,China;State Key Laboratory of Geological Hazard Prevention and Geological Environmental Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]杭州水利水电勘测设计院有限公司,浙江杭州310000 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《吉林水利》2025年第4期1-5,共5页Jilin Water Resources

基　　金：四川省水利水电开发有限公司科研试验项目(SHKA-G20160)。

摘　　要：为分析水工隧洞围岩中泥岩的水化学腐蚀效应,开展单轴抗压试验和核磁共振扫描,研究了不同腐蚀循环次数下强度性能和结构损伤程度的演化规律。试验结果表明:在持续的水化学腐蚀作用下,泥岩表现出脆性破坏特征,岩石的整体损伤程度显著提高;随着水化学腐蚀次数增加,泥岩的强度指标(即单轴抗压强度、变形模量)出现衰减,80次腐蚀作用后的衰减趋势趋于稳定;泥岩的核磁共振试验结果定量化地表征了泥岩孔隙结构在水化学腐蚀过程中的损伤程度;强度与孔隙率具有良好的线性关系,表明泥岩宏观力学性能与微观结构的变化密切相关。研究成果可为输水隧洞围岩工程提供重要参考。To analyze the hydrochemical corrosion effect of mudstone in the surrounding rock of the hydraulic tunnel,uniaxial compression tests and nuclear magnetic resonance scanning were conducted to investigate the evolution law of strength properties and structural damage degree under diverse corrosion cycles.The test outcomes reveal that the mudstone demonstrates brittle failure characteristics under continuous hydrochemical corrosion,and the overall damage degree of the rock is conspicuously augmented.With the escalation of the times of hydrochemical corrosion,the strength indices of mudstone,namely the uniaxial compressive strength and deformation modulus,deteriorate,and the deterioration trend tends to stabilize after 80 times of corrosion.The damage degree of the mudstone pore structure during hydrochemical corrosion is quantified by the results of nuclear magnetic resonance experiments.There exists an excellent linear relationship between strength and porosity,indicating that the macroscopic mechanical properties of mudstone are intimately associated with the alterations of the microstructure.The results of this study offer a significant reference for the objective comprehension of the engineering performance of the tunnel's surrounding rock.

关 键 词：隧洞 泥岩 水化学 力学性能 孔隙结构 

分 类 号：TV52[水利工程—水利水电工程]