基于现场测试土的动力学参数修正方法的研究  

Research on the modification method of soil dynamic parameters

作　　者：刘建民 郭婷婷 蒋其峰 邱月[3] 付海清 LIU Jianmin;GUO Tingting;JIANG Qifeng;QIU Yue;FU Haiqing(Shandong Earthquake Agency,Jinan 250014,China;Shandong Institute of Earthquake Engineering,Jinan 250021,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China;Shandong Jianzhu University,Jinan 250021,China)

机构地区：[1]山东省地震局,济南250014 [2]山东省地震工程研究院,济南250021 [3]山东科技大学矿山灾害预防控制-省部共建国家重点实验室实验室培育基地,青岛266590 [4]山东建筑大学,济南250021

出　　处：《建筑结构》2022年第S02期2177-2181,共5页Building Structure

基　　金：山东省地震局一般科研项目(YB2209);中国地震局星火专项(XH20035);山东科技大学人才引进科研启动基金项目资助(2017RCJJ004);山东省自然科学基金(No.ZR2020QE276)

摘　　要：土的动剪切模量比和阻尼比是土层地震反应反应分析中的重要参数,而动三轴试验对小应变下相关参数的测试结果常常存在一定误差。为此,利用现场波速测试法、动三轴反推法、Hardin公式推导等,对比了土的最大动剪切模量及阻尼比,并根据理论分析确定了利用现场波速测试和Hardin公式推导值对动剪切模量、阻尼比修正的方法及公式,给出了修正后的结果。研究表明:动三轴反推方法获取的最大动剪切模量值较小且规律性不强,现场波速测试和Hardin公式推导获取的最大动剪切模量值,均显现出相似的规律,即随着深度增大逐渐增大的趋势;根据理论分析,确定了采用现场波速测试和Hardin公式推导值对动剪切模量、阻尼修正的方法及公式;修正后的最大动剪切模量比、阻尼比与规范值及推荐值相比,该结果更加符合场地实际情况。According to the G_(max)and D of soil in the soil layer response analysis, using the field wave velocity test method, dynamic triaxial backward calculation method, Hardin formula derivation, etc., comparing the G_(max)of soil.According to the theoretical analysis, the method and formula of correction of G and λ_(d) by field wave velocity test and Hardin formula are determined, the revised results are presented.The study showed that: The G_(max)by the dynamic triaxial method is small and irregular, G_(max)by field wave velocity test and Hardin formula derivation shows a certain regularity with the increase of depth. According to the theoretical analysis, the method and formula for modifying the dynamic shear modulus and damping by using the field wave velocity test and the derived value of Hardin formula are determined. Compared with the standard and recommended values, the modified modulus ratio and damping ratio are more reasonable and accurate.

关 键 词：最大动剪切模量 剪切模量比 阻尼比 动三轴 

分 类 号：TU435[建筑科学—岩土工程]