酸腐蚀下粉砂质泥岩力学特性及细观机理研究  

Study on the Mechanical Properties and Meso-Mechanism of Silty Mudstone under Acid Corrosion

作　　者：付宏渊[1,2] 龙彪 史振宁[1] 曾铃[2] 高乾丰 Fu Hongyuan;Long Biao;Shi Zhenning;Zeng Ling;Gao Qianfeng(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,P.R.China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,P.R.China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙410114 [2]长沙理工大学土木工程学院,长沙410114

出　　处：《地下空间与工程学报》2022年第5期1441-1451,共11页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(51908069,51838001,51878070);湖南省自然科学基金项目(2022JJ40491);长沙市自然科学基金项目(kq2014110)。

摘　　要：为探究酸性环境下粉砂质泥岩宏观力学性质变化规律与孔隙变化规律及其内在联系,对不同pH值条件下不同腐蚀时间的粉砂质泥岩试样开展单轴压缩试验、电镜扫描试验及能谱分析试验,得到了不同溶液pH值与不同腐蚀时间对粉砂质泥岩试样宏观力学性质及细观损伤特性的影响规律。结果表明:(1)随着溶液pH值的减小及腐蚀时间的增加,试样的单轴抗压强度及弹性模量显著降低;(2)孔隙率及次生孔隙率显著增大,断口表面越来越粗糙;(3)粉砂质泥岩试样受酸溶液腐蚀机制主要是岩体内Al_(2)O_(3)等化合物与酸性溶液中的H^(+)发生化学反应,从而引起试样的宏观力学性质劣化。To explore the variation law of macroscopic mechanical properties and meso-pore changes of silty mudstone under acidic environment and their internal relationship,uniaxial compression tests,scanning electron microscope tests and energy spectrum analysis tests were carried out on silty mudstone samples under different PH values and different corrosion times.The effects of different PH values and different corrosion time on the macroscopic mechanical properties and meso-damage characteristics of silty mudstone samples were obtained.The results show that:(1)with the decrease of PH value and the increase of corrosion time,the uniaxial compressive strength and elastic modulus of the samples decrease significantly;(2)The porosity and secondary porosity increase significantly,and the fracture surface becomes rougher and rougher;(3)The corrosion mechanism of silty mudstone samples by acid solution is mainly the chemical reaction of Al_(2)O_(3) and other compounds in the rock mass with H^(+) in acid solution,leading to the deterioration of the macroscopic mechanical properties of the samples.

关 键 词：粉砂质泥岩 酸性环境 单轴抗压强度 弹性模量 孔隙率 

分 类 号：TU45[建筑科学—岩土工程]