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土体剪切波速是工程场地地震安全性评价和地震小区划工作需涉及的重要参数之一。以福建沿海的福州,泉州,漳州3个盆地为研究对象,基于大量剪切波速实测资料,得到各盆地土体等效剪切波速的空间分布特征:①泉州盆地等效剪切波速整体大于福州、漳州两个盆地;②福州盆地等效剪切波速呈现出闽江沿岸地区较小的分布特征。基于最小二乘法的拟合结果,福州、漳州盆地的土层剪切波速随深度的变化呈线性关系,泉州盆地则呈二次多项式的非线性关系,并推荐了其拟合参数;拟合公式预测的场地不同深度处土层的剪切波速值,与场地的实测剪切波速值基本吻合,可为该地区无剪切波速实测值的场地提供较好的参考依据。
Soil shear wave velocity is one of the important parameters to be involved in the seismic safety evaluation and small area zoning of engineering sites. Taking the three basins in Fuzhou, Quanzhou and Zhangzhou of Fujian Province as the research objects, the spatial distribution characteristics of equivalent shear wave velocity of the soils in the basins are obtained based on the measured data of a large number of shear wave velocities. ① The equivalent shear wave velocity in Quanzhou basin is larger than that of Fuzhou , And Zhangzhou two basins. (2) The equivalent shear wave velocity in Fuzhou basin shows a relatively small distribution along the Minjiang River. Based on the fitting result of least square method, the shear wave velocity of soil in Fuzhou and Zhangzhou basins shows a linear relationship with the depth, and the non-linear relationship of quadratic polynomials in Quanzhou basin, and the fitting parameters are suggested. The fitting formula The predicted shear wave velocity values of soil layers at different depths are in good agreement with the measured shear wave velocity values of the site, which can provide a good reference for the field without shear wave velocity measurement in this area.