水下抛石电阻率特性试验研究
Experimental study of electrical resistivity traits in underwater riprap
梁越 1张宏杰 1许彬 1马士谦 2夏日风 1代磊1
作者信息
- 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;重庆交通大学 水利水运工程教育部重点实验室,重庆 400074
- 2. 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;中交武汉港湾工程设计研究院有限公司,湖北 武汉 430040
- 折叠
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.
Abstract
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Key words
underwater riprap/defect detection/electrical resistivity/void fraction/power supply voltage引用本文复制引用
基金项目
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(CSTB2022TIAD-GPX0045)
重庆市博士后基金特别资助项目(2022CQBSHTB1010)
重庆交通大学研究生科研创新项目(2022B0006)
出版年
2024
NETL
NSTL
维普
万方数据