摘要
为研究水化学-冻融作用对安山岩的物理性质与剪切力学特性的影响,以西藏多龙矿集区的安山岩为研究对象,在三种水化学环境下进行45次冻融循环试验,从宏、微观角度分析了安山岩剪切力学参数和物理指标的变化规律及损伤机理。结果表明:随冻融循环次数增加,三种水化学环境中安山岩的物理指标和剪切力学参数均呈劣化趋势,其中酸性环境下岩石损伤最大;随冻融循环次数增加,三种环境下岩石黏聚力的降低幅度均大于其内摩擦角的降低幅度,且不同环境下破坏形式各异,酸性环境为剪切破坏,中性环境下为剪断破坏,碱性环境下为拉剪破坏;基于剪切试验构建的剪切力学预测模型,其预测误差小于10%,可有效预测不同化学环境中长期冻融后岩石的黏聚力和内摩擦角;基于剪切试验参数对水化学和冻融作用损伤进行量化分析,冻融循环对安山岩的损伤高于水化学作用。
To investigate the effects of hydrochemical and freeze-thaw(HFT)on the physical properties and shear mechanical characteristics of andesite,freeze-thaw tests were conducted for 45 cycles under three different hydrochemical environments.The andesite samples from the Duolong mining area in Xizang was selected as the research object.The changes in shear mechanical parameters and physical properties,as well as the damage mechanisms,were analyzed from both macroscopic and microscopic perspectives.The results show that,as the number of freeze-thaw cycles increases,both the physical properties and shear mechanical parameters of andesite in all three hydrochemical environments exhibit a deterioration trend,with the most significant damage observed in the acidic environment.The decrease in cohesion is more pronounced than that in the internal friction angle,and the failure modes differ among environments:shear failure in acidic environments,shear fracture failure in neutral environments,and tensile shear failure in alkaline environments.A shear mechanical prediction model based on shear test data was established,with an error of less than lo%,which can effectively predict the cohesion and internal friction angle values of the rock after long-term freeze-thaw cycles in different chemical environments.Quantitative analysis of damage caused by hydrochemical and freeze-thaw effects based on shear test parameters shows that freeze-thaw cycles cause more damage to andesite than hydrochemical effects.
作者
付俊
梁瑞
李洪超
吴灿萍
余璨
李嘉淇
刘轩泽
FU Jun;LIANG Rui;LI Hongchao;WU Canping;YU Can;LI Jiaqi;LIU Xuanze(Kunming Survey,Design and Research Institute Co.,Ltd.,of China Nonferrous Metals Industry,Kunming,Yunnan 650051,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;Yunnan Key Laboratory of Geotechnical Engineering and Geohazards,Kunming,Yunnan 650051,China;City College,Kunming University of Science and Technology,Kunming,Yunnan 650051,China;Faculty of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming,Yunnan 650093,China)
出处
《矿业研究与开发》
北大核心
2025年第12期186-194,共9页
Mining Research and Development
基金
国家自然科学基金项目(52164010,52164016)
云南省院士专家工作站科技项目(202405AF140045)
昆明市中青年学术和技术带头人科技专项(202405B040035)
中国有色金属工业昆明勘察设计研究院有限公司科技创新项目(2022YN05A3,2023YN06)。
关键词
安山岩
水化学
冻融循环
剪切特性
损伤机理
Andesite
Hydrochemical
Freeze-thaw cycles
Shear characteristy
Damage mechanism
