| 摘要: |
| 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,采用四电极法研究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。研究表明：水下抛石电阻率随供电电压(10~60 V)不断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不断增加而逐渐减小至趋于稳定(两者之间的演化曲线可采用递减型幂函数形式表征),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、指数函数以及对数函数拟合电阻率与空隙率关系,发现在幂函数拟合下误差最小,并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赋存状态,从而快速识别水下抛石坝内部隐患。 |
| 关键词: 水下抛石 隐患探测 电阻率 空隙率 供电电压 |
| DOI： |
| 分类号:TU432 |
| 基金项目:重庆市技术创新与应用发展专项面上项目(CSTB2022TIAD-GPX0045)；国家重点研发计划项目(2018YFB1600400)；重庆交通大学研究生科研创新项目(2022B0006) |
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| Experimental study on electrical resistivity characteristics of underwater riprap |
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LIANG Yue1, ZHANG Hongjie1, XU Bin1, MA Shiqian2, XIA Rifeng1, DAI Lei1
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1.National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University;2.Hubie Key Laboratory of Advanced Materials and Reinforcement Technology Research for Marine Environment Structures
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| Abstract: |
| The aim is to use electrical resistivity technology to solve the key problems of underwater riprap dams (concealed engineering), such as defect detection and quality evaluation. The electrical resistivity characteristics of underwater riprap under different supply voltage and void fraction conditions are studied by the four-electrode method. The empirical formula between electrical resistivity and the occurrence state of underwater riprap was established. The study shows that the electrical resistivity of underwater riprap attenuates rapidly with the increasing supply voltage (10-60 V) and then gradually stabilizes. The attenuation is significantly reduced when the supply voltage is higher than 30 V. The electrical resistivity of underwater riprap decreases with the increasing void fraction to stabilization (the evolution curve between the two can be characterized as a decreasing power function). The variation of electrical resistivity with void fraction different supply voltages is similar. The power, exponential, and logarithmic functions are selected to fit the relationship between electrical resistivity and void fraction. It is found that the error is the smallest under power function fitting, and the empirical formula between void fraction and electrical resistivity of underwater riprap is finally established by considering the influence of supply voltage. Furtherly, the reliability of the empirical formula was verified by the underwater riprap dam model test, which can effectively describe the occurrence state of underwater riprap and quickly identify the internal defect problems of the underwater riprap dam. |
| Key words: underwater riprap defect detection electrical resistivity void fraction power supply voltage |
