黑龙江省土动力学参数变异性研究  

Study on the variability of soil dynamic parameters in Heilongjiang Province

作　　者：齐文浩[1,2] 李林芳 陈方晓 张苋凯 QI Wenhao;LI Linfang;CHEN Fangxiao;ZHANG Xiankai(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2025年第2期145-154,共10页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2021C07);黑龙江省科学基金项目(LH2021E121)。

摘　　要：土动力学参数是土层地震反应计算的必备参数。针对当前黑龙江省土动力学特性理论研究的不足,基于黑龙江省286组不同埋深的粉质黏土、黏土和砂土的动剪切模量比和阻尼比数据,反推得到每组土动力学参数的特征参数,并统计给出特征参数随土体埋深变化的拟合公式。通过该公式,推算了不同埋深下不同土类的动剪切模量比和阻尼比数据,并验证了拟合公式的合理性。利用数据较为丰富的土类,建立了6个土层地震反应模型,输入黑龙江省的典型地震动,分别计算了拟合公式的a_(1)、a_(2)、E(λ_(max))、E(M)等拟合参数。通过放缩拟合参数研究了特征参数变异性对地表峰值加速度、地表反应谱特征周期和平台值的影响。结果表明,随着a_(1)和E(λ_(max))的增加,阻尼比增大,导致场地放大系数F_(PGA)减小,特征周期T g增大。a_(2)和E(M)的增加则会导致阻尼比减小,进而导致F_(PGA)增大,T g减小。平台值β离散性较大,在某一范围内波动,并无确定的增减趋势。变异性对F_(PGA)的影响最大,T g次之,对β的影响最小。土层地震反应对a_(1)变异最敏感。随着输入地震动强度的增加,误差增大。本研究为黑龙江省土动力学参数研究做出了必要补充。Soil dynamic parameters are crucial calculation parameters for the seismic response of soil.However,there is currently insufficient theoretical research on soil dynamic characteristics in Heilongjiang Province.To address this,we analyzed data on the dynamic shear modulus ratio and damping ratio of 286 groups of clay,clayey soil,and sandy soil at different burial depths in the region.We derived the characteristic parameters of each group of soil dynamic parameters and statistically obtained a fitting formula for the variation of these parameters with soil burial depth.Using this formula,we calculated the dynamic shear modulus ratio and damping ratio data of different soil types at different burial depths and verified the rationality of the fitting formula.We established six soil seismic response models using soil types with abundant data and input typical seismic motions in Heilongjiang Province.We calculated the fitting parameters a_(1),a_(2),E(λ_(max)),E(M),etc.of the fitting formula and studied the influence of the variability of characteristic parameters on peak ground acceleration,characteristic period,and plateau value of ground response spectrum by scaling the fitting parameters.Results show that with the increase of a_(1)and E(λ_(max))the damping ratio increases,resulting in a decrease in the site amplification factor F_(PGA)and an increase in the characteristic period T g.The increase of a_(2)and E(M)will lead to a decrease in the damping ratio,resulting in an increase in F_(PGA)and a decrease in T g.The plateau valueβhas a large variability,fluctuating within a certain range without a definite increasing or decreasing trend.Variability has the greatest impact on F_(PGA),followed by its impact on T g,and then onβ.The soil seismic response is the most sensitive to the variability of a_(1).As the intensity of the input seismic motion increases,the error increases.Overall,this study provides necessary supplements to the research on soil dynamic parameters in Heilongjiang Province.

关 键 词：土动力学参数 变异性 土层地震反应 黑龙江省 地震动参数 

分 类 号：TU435[建筑科学—岩土工程]