基于实测数据的场地特征参数与液化相关性分析

Measured data-based analysis of correlation between liquefactive characteristic parameters and liquefaction

通过搜集国内外现有的地震液化实测数据,利用皮氏积距相关系数法分析了影响砂土液化的PGA、地下水位、饱和砂层埋深、标贯击数以及剪切波速等特征参数与液化的相关性,对比研究了在不同埋深、地下水位和烈度范围内各参数相关性的表现以及各参数相关性间的对比,得到了实际动荷情况、真实埋藏条件以及现场实测下土力学指标与液化关联性的真实结果。分析结果表明:地下水位、砂层埋深、标贯击数和剪切波速与液化呈负相关,PGA与液化呈正相关;砂层埋深、标贯击数与液化显著相关,而地下水位和剪切波速与液化相关性不显著;标贯击数与液化的相关性最大,其次为埋深、PGA和水位,最小为剪切波速。

Through collecting measured data of liquefaction at home and abroad,the correlations between characteristic paramelers influencing liquefaction such as PGA,ground water level,buried depth of saturated sand layer,SPT counts and shear wave velocity and liquefaction were analyzed by means of Pearson correlation method.The correlative performance of the characteristic parameters with liquefaction was comparatively analyzed under conditions of different buried depths,ground water levels and seismic intensities.The real correlations between characteristic parameters and liquefaction were obtained corresponding to real dynamic loading,real buried condition and in-situ testing data.The analytical results show that ground water level,buried depth of sand layer,SPT and shear wave velocity present negative correlations with liquefaction while the of PGA presents positive corretation with liquefaction.The correlations of buried depth of sand layer,SPT were remarkable while the correlations of ground water level,shear wave velocity were weak.The correlation coefficient of SPT is the largest,followed by buried depth of sand layer,PGA and ground water level.