北部湾吹填场地卓越周期演化特征分析  

Analysis on the characteristics of predominant periodic evolution of hydraulic reclamation site in Beibu Gulf

作　　者：张剑钊 杨猛 周东[1,2] ZHANG Jianzhao;YANG Meng;ZHOU Dong(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;National Experimental Teaching Demonstrating Center of Civil and Construction Engineering,Guangxi University,Nanning 530004,China;Guangxi Baidong Investment Co.,Ltd.,Baise 533000,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学土木建筑工程国家级实验教学示范中心,南宁530004 [3]广西百东投资有限公司,广西百色533000

出　　处：《桂林理工大学学报》2023年第3期430-435,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51378132)。

摘　　要：以北部湾吹沙型填海场地为背景,通过浸泡-加载联动试验和有限元计算方法研究了外界条件差异对北部湾吹填场地卓越周期的影响。结果表明:在远场长周期地震动作用下,北部湾吹填场地反应最为强烈,其加速度反应谱峰值放大了近两倍,卓越周期向长周期方向偏移且相对偏移量最小,产生共振危害几率增大;输入地震动幅值增大,吹填场地对其短周期高频部分抑制效应和长周期低频部分放大作用变强,场地卓越周期向长周期方向演化的趋势增加;随着堆载预压加固荷载增大,场地地表中心动力响应减弱,卓越周期呈减小的趋势,预压处理达到一定程度后,场地由Ⅳ类场地变为Ⅲ类场地。From the research of Beibu Gulf sand blowing reclamation site,the influence of the difference of ex-ternal conditions on the predominant period of Beibu Gulf dredger reclamation site is studied by means of immer-sion-loading linkage test and finite element calculation method.The results show that the Beibu Gulf reclamation site has the strongest response under the action of long period ground motion.The peak value of site acceleration response spectrum magnifies nearly 2 times.The predominant period shifts to the direction of long period and the relative offset is the least.The resonance hazard probability of the site increases as the amplitude of input ground motion increases.The suppression effect of the filling site on the short-period high-frequency part and the amplification effect of the long-period low-frequency part become stronger.The evolution trend of site pre-dominance period to long period increases with the increase of surcharge preloading reinforcement load.The dy-namic response of site surface center weakens.The predominance period tends to decrease.After preloading treatment to a certain extent,the site type changes from siteⅣto siteⅢ.

关 键 词：吹填场地 卓越周期 数值分析 

分 类 号：TU435[建筑科学—岩土工程] TU447[建筑科学—土工工程]