锁定回填下沉管隧道地震稳定性  

Seismic stability of immersed tunnel under locked backfill

作　　者：王秋哲 韩瑞 白笑笑 赵凯[2] WANG Qiuzhe;HAN Rui;BAI Xiaoxiao;ZHAO Kai(School of Architectural Engineering and Management,Jiangsu Vocational College of Business,Nantong 226000,Jiangsu,China;Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210000,Jiangsu,China)

机构地区：[1]江苏商贸职业学院建筑工程与管理学院,江苏南通226000 [2]南京工业大学岩土工程研究所,江苏南京210000

出　　处：《隧道与地下工程灾害防治》2023年第3期71-77,共7页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金资助项目(51978335,52168044);岩土力学与工程国家重点实验室开放基金资助项目(Z019101)。

摘　　要：为研究沉管隧道地震稳定性,基于扩展Masing法则构造土体黏弹塑性应力-应变滞回曲线,将剪切-耦合体积应变增量模型作为Biot动力固结方程中残余孔隙水压力增长的源项,建立砂土液化过程的有效应力分析方法,基于FLAC^(3D)计算平台实现该有效应力分析方法。建立砂质海床-锁定回填-沉管隧道相互作用模型,对地震动作用下锁定回填沉管隧道周围海床的抗液化机理进行研究。结果表明:锁定回填提高了沉管隧道周围海床的抗液化强度,同时增大了沉管隧道的侧摩阻力,最终减小了沉管隧道在地震动作用下的残余上浮量,有效地提高了沉管隧道的地震稳定性。In order to study the seismic stability of immersed tunnel,a viscoelastic-plastic stress-strain hysteresis curve was established based on the extended Masing rule,and the shear-coupled volumetric strain increment model was taken as the source term of the residual pore water pressure growth in Biot dynamic consolidation equation,an effective stress analysis method for sand liquefaction was established.The method was implemented based on the FLAC^(3D) computing platform.The interaction model between sandy seabed and submarine tunnel was established,and the anti-liquefaction mechanism of locked backfilling under seismic loading was studied.The results showed that the locked backfilling increased the anti-liquefaction strength of the seabed and the friction resistance,finally reduced the residual uplift distance,which effectively improved the seismic stability of the immersed tunnel.

关 键 词：沉管隧道 地震反应 土-结构相互作用 抗液化措施 有效应力方法 

分 类 号：TU433[建筑科学—岩土工程]