黑龙江地区土层剪切波速与埋深关系及其变异性对土层地震反应的影响

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中图分类号：TU435 文献标志码：A 文章编号：1000-0844（2025）05—1055—11

Abstract： Shear wave velocity （vs ），an inherent property of geotechnical materials with substantial regional characteristics，critically influences the seismic response of soil layers.Utilizing vS data from seismic safety evaluations at major engineering sites in the Heilongjiang area， statistical regressions were performed using linear， binomial， power function，and power-function-withconstant models across various soil types， including silty clay， clay， sand， gravelly soil， and weathered rock. The resulting fiting parameters and goodness-of-fit indicators for diferent models were obtained，providing insights into the relationship between vS and burial depth for common soil types in the Heilongjiang area. Systematic errors in vS measurements can impact seismic response calculations. Focusing on the Heilongjiang area， this study investigated how vS variability affects seismic response parameters， specifically the site amplification factor （FPGA） ），spectral plateau value （β） ，and characteristic period （Tg ） under varying seismic intensities. Key results indicate the following： （1） vS increases nonlinearly with burial depth;（2） negative variations in vs generally reduce FPGA and β while increasing Tg ，whereas positive variations produce the opposite effects；（3） negative variations in vS have a substantially greater influence on all three parameters than positive variations;（4） sensitivity to vs variability follows the order： Tg>FPGA>β ; （5） stronger input motions amplify errors caused by vS variability；and （6） for soft sites， vs measurement accuracy cannot be ignored and overestimation of test results may severely affect long-period structures.

Keywords： shear wave velocity; burial depth； variability; seismic response of soil layers; Heilongjiang area

0 引言

场地是工程建设的基础，大量震害调查数据表明场地条件对地震动和震害的影响至关重要[1]1906年旧金山地震[2]、1985年墨西哥地震[3]、2008年汶川地震[4]和2021年漾濞地震[5]均表明同一地震不同场地震害程度存在显著差异。（剩余13989字）