渗流管涌是堤防最常见的破坏形式之一,高水位期准确探明渗漏通道分布对堤防除险加固意义重大。利用渗漏水良导电性,提出通过向漏水口供人工电流,观测渗漏通道导电回路产生的一次感应微弱磁场能量查找渗漏通道的方法,称为渗漏通道弱磁探测法。基于室内物性参数试验和正演计算,分析堤防土体导电性随含水率的变化趋势,揭示不同形态渗漏通道的弱磁场空间分布特征;系统总结弱磁场强度、电流密度随渗漏通道埋深、电导率的变化规律。物理模型试验结果表明弱磁探测法能有效查明渗漏通道的空间分布形态,具有效率高、无接地电极、抗干扰性强等优势。该技术将对促进堤防渗漏隐患探测技术的发展具有重要科学意义和实用价值。
Abstract
Seepage piping is a most common failure mode of dike. Accurate detection of dike piping channels during high water level is of great significance to the reinforcement of dike. We propose a method to identify seepage channel by providing artificial current to the seepage opening and observing the primary induced weak magnetic field energy generated by the conductive circuit of the seepage channel. Based on laboratory physical parameter test and forward simulation calculation, we looked into the variation trend of electrical conductivity of embankment soil with water content, and revealed the spatial distribution characteristics of weak magnetic field in different seepage channels. We further summarized the variation law of weak magnetic field intensity and current density with the depth and conductivity of leakage channel. The results of physical model test show that the weak magnetic detection method effectively identifies the spatial distribution of seepage channels. It is highly efficient and has strong anti-interference capability with no grounding electrode. It is expected to offer pragmatic value for promoting the detection technology of hidden seepage danger in dike.
关键词
堤防隐患 /
渗漏通道 /
弱磁探测技术 /
弱磁场特征 /
一次感应磁场
Key words
hidden danger of dike /
seepage channel /
weak magnetic detection technology /
weak magnetic field characteristics /
primary induced magnetic field
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基金
国家重点研发计划项目(2017YFC1502600);国家自然科学基金青年基金项目(41702321)
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