Abstract: This study aims to evaluate the internal erosion sensitivity of dam core soil of Minjiang navi- gation and hydropower hub project under controlled seepage conditions. The geotechnical properties and dispersibility of soil are analyzed through laboratory tests to reveal the erosion vulnerability mechanism. Based on the measurement results and engineering guidelines, the soil is classified and the erosion sensi- tivity is evaluated. The test results show that the sample size significantly affects the erosion parameters, and there are significant differences between different units. Although the erosion coefficient values vary by test units, according to the engineering criteria, the three types of soil erosion categories are generally similar. It is worth noting that the soil with lower clay content exhibits stronger resistance to internal ero - sion. This study provides important foundation for understanding the internal erosion sensitivity of dam core soil, and reveals the key effects of sample size and clay content on the erosion process.

Key words: dam, internal erosion, core soil, pitting corrosion test, erosion sensitivity, dispersibility

摘要： 本研究旨在评估岷江航电枢纽工程大坝核心土壤在受控渗流条件下的内部侵蚀敏感性。通过实验室试验分析土壤的岩土力学特性和分散性，以揭示其侵蚀脆弱性机制。基于测量结果和工程指南，对土壤进行分类和侵蚀敏感性评估。试验表明，试样尺寸显著影响侵蚀参数，不同单元间存在显著差异。尽管侵蚀系数值因试验单元而异，但根据工程准则分类，试验的三种土壤总体上属于相近的侵蚀类别。值得注意的是，黏土含量较低的土壤展现出更强的抗内部侵蚀能力。本研究为理解大坝核心土壤的内部侵蚀敏感性提供了重要依据，揭示了试样尺寸和黏土含量对侵蚀过程的关键影响。

关键词: 大坝, 内部侵蚀, 核心土壤, 孔蚀试验, 侵蚀敏感性, 分散性