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渗透破坏对堤防工程危害很大,形式主要有管涌和流土。影响土体发生渗透破坏的因素有其颗粒级配、密实度、渗透系数、土体结构等。发生渗透破坏的必要条件是土体的水力坡降大于其临界水力坡降,临界坡降的大小反应了土体发生渗透破坏的难易程度。本文基于文献中渗透破坏实验数据,运用主成分回归分析模型建立了临界水力坡降与土体各物理性质的关系。
Infiltration and destruction of the embankment project is very harmful, mainly in the form of piping and runoff. Affect the soil infiltration and destruction of the factors have their particle size distribution, density, permeability coefficient, soil structure. The necessary condition of infiltration and destrucion is that the hydraulic gradient of the soil is larger than the critical hydraulic gradient, and the critical gradient of the gradient reflects the difficulty of infiltration and destruction of the soil. Based on the experimental data of infiltration and destruction in the literature, the paper establishes the relationship between the critical hydraulic gradient and the physical properties of the soil by principal component regression analysis model.