低速水流作用下砂岩力学特性与参数损伤特性  

Mechanical Properties and Parametric Damage Characteristics of Sandstone Under the Action of Low-Velocity Water Flow

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作  者:马记[1] 万文 田洪义 陈伟 周彧 舒彬[1] MA Ji;WAN Wen;TIAN Hongyi;CHEN Wei;ZHOU Yu;SHU Bin(School of High-Speed Railway Engineering,Shaanxi Railway Institute,Weinan,Shaanxi 714000 China;School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;China Railway Tunnel Survey Design and Research Institute Co.,Ltd.,Guangzhou,Guangdong 511458,Guangdong,China;College of Construction Engineering,Hunan University of Engineering,Xiangtan,Hunan 4ll104,China)

机构地区:[1]陕西铁路工程职业技术学院高铁工程学院,陕西渭南市714000 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭市411201 [3]中铁隧道勘察设计研究院有限公司,广东广州511458 [4]湖南工程学院建筑工程学院,湖南湘潭市411104

出  处:《矿业研究与开发》2022年第12期113-119,共7页Mining Research and Development

基  金:国家自然科学基金面上项目(51774132);渭南市重点研发计划项目(2019ZDYF-JCYJ-136);陕西铁路工程职业技术学院科学研究基金项目(KY2021-38)。

摘  要:以砂岩为试验与研究对象,基于自然干燥状态对比不同流速及不同pH值的水化学溶液腐蚀作用,进行一系列的单轴、三轴压缩试验,对比分析了水化学溶液作用下砂岩的强度与变形特征以及相关参数的响应机制。试验结果发现:砂岩的单轴、三轴抗压强度、各阶段特征应力、弹性模量、黏聚力以及内摩擦角随着溶液pH值的减小、水流流速的增大而降低,但泊松比随之增大;微细观结构方面,随着溶液pH值的减小、水流流速的增大,孔隙率逐渐增大,原先较为致密的孔隙结构逐渐向不规则蜂窝状结构发展,导致砂岩宏观变形和强度特性逐步劣化。A series of uniaxial and triaxial compression tests were conducted to compare the strength and deformation characteristics of sandstone and the response mechanism of relevant parameters under the action of water-chemical solution based on the corrosive effects of water-chemical solution with different flow velocities and different pH values in the natural dry state.The test results show that,with the decrease of solution pH and the increase of water flow velocity,the uniaxial and triaxial compressive strengths,characteristic stress at each stage,elastic modulus,cohesion and internal friction angle of sandstone decrease,however,Poisson’s ratio increases.In terms of microstructure,the porosity gradually increases with decreasing solution pH and increasing water flow velocity,and the original dense pore structure gradually develops into irregular honeycomb structure,which leads to macroscopic deformation and gradual deterioration of strength characteristics for sandstone.

关 键 词:砂岩 水化腐蚀 流速 岩石力学参数 微细观结构 

分 类 号:TD313[矿业工程—矿井建设] TD315

 

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