水下抛石电阻率特性试验研究  

Experimental study of electrical resistivity traits in underwater riprap

作　　者：梁越[1,2] 张宏杰[1,2] 许彬 马士谦 夏日风 代磊 LIANG Yue;ZHANG Hongjie;XU Bin;MA Shiqian;XIA Rifeng;DAI Lei(National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Hydraulic and Waterway Engineering of Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China;Hubei Key Laboratory of Advanced Materials&Reinforcement Technology Research for Marine Environment Structures,Wuhan 430040,China;CCCC Wuhan Harbor Engineering Design&Research Institute Co.,Ltd.,Wuhan 430040,China)

机构地区：[1]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074 [2]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [3]海工结构新材料及维护加固技术湖北省重点实验室,湖北武汉430040 [4]中交武汉港湾工程设计研究院有限公司,湖北武汉430040

出　　处：《水利水运工程学报》2024年第2期100-107,共8页Hydro-Science and Engineering

基　　金：国家自然科学基金面上项目(52379097);重庆市技术创新与应用发展专项面上项目(CSTB2022TIADGPX0045);重庆市博士后研究项目特别资助项目(2022CQBSHTB1010);重庆交通大学研究生科研创新项目(2022B0006)。

摘　　要：研究旨在利用电阻率技术解决水下抛石坝(隐蔽性工程)隐患探测和质量评价等关键问题。采用四电极法分析了水下抛石在不同供电电压和空隙率条件下的电阻率特性,并建立了电阻率与水下抛石空隙率的经验公式。结果表明:水下抛石电阻率随供电电压(10~60 V)升高呈先衰减后逐渐趋于稳定的变化特征,且供电电压高于30 V时电阻率衰减程度显著降低;水下抛石电阻率随空隙率的增加逐渐减小并趋于稳定(两者间的关系可用递减型幂函数表征),且不同供电电压下电阻率随空隙率的变化规律与此类似;分别选用幂函数、指数函数及对数函数拟合电阻率与空隙率关系,发现幂函数拟合误差最小,考虑供电电压影响最终建立了水下抛石电阻率与空隙率的经验公式;进一步通过水下抛石坝模型试验验证了经验公式的可靠性。该经验公式可有效描述水下抛石分布的密实程度,从而快速识别水下抛石坝内部隐患。The objective of this research is to employ electrical resistivity technology to address key issues in underwater riprap dams,such as defect detection and quality evaluation.The study investigates the electrical resistivity characteristics of underwater riprap under varying supply voltage and void fraction conditions using the four-electrode method.An empirical formula is established to correlate electrical resistivity with the occurrence state of underwater riprap.The research reveals that the electrical resistivity of underwater riprap rapidly decreases with increasing supply voltage(10-60 V),stabilizing at higher voltages(>30 V).The electrical resistivity also decreases with increasing void fraction until it stabilizes.The relationship between electrical resistivity and void fraction shows similar patterns for different supply voltages.The power,exponential,and logarithmic functions are used to fit the relationship between electrical resistivity and void fraction,with the power function providing the smallest error.The empirical formula for void fraction and electrical resistivity of underwater riprap is then established,taking into account the influence of supply voltage.The empirical formula's reliability is verified through an underwater riprap dam model test,enabling effective description of the occurrence state of underwater riprap and quick identification of internal defects in underwater riprap dams.

关 键 词：水下抛石 隐患探测 电阻率 空隙率 供电电压 

分 类 号：TU432[建筑科学—岩土工程]