海底管线周围海床瞬时液化的数值分析  

Numerical Analysis of Seabed Momentary Liquefaction along Submarine Pipelines

作　　者：张小玲[1] 栾茂田[1,2] 郭莹[1,2] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116024 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《防灾减灾工程学报》2009年第2期165-171,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金重点基金项目(50439010;50639010);国家自然科学基金项目(50579006);教育部科学技术研究重大项目(305003)资助

摘　　要：地震荷载作用下,海床液化是海底管线失稳的主要原因之一。本文采用Mohr-Coulomb模型和Drucker-Prager模型,基于饱和多孔介质的Biot动力固结方程,进行了有效应力分析;利用大型有限元计算软件ADINA,计算得到了海底管线周围海床土体中的超孔隙水压力及其变化规律,并在此基础上进行了瞬时液化分析。在数值计算的过程中,引入粘弹性人工边界的方法模拟地震波由有限域到无限域的传播,从而更为实际地反映了在地震作用下,海底管线周围土体的动力响应问题。The seabed liquefaction under seismic loading is one of the main factors governing the overall stability of submarine pipelines. Based on Biot＇s equations of dynamic consolidation for fully-saturated media, Mohr-Coulomb model and Drucker-Prager model were adopted to analyze the effective stress, and the values and regularity of excess pore water pressure in seabed along submarine pipelines were computed with ADINA, a general-purpose FEM analysis package, to estimate and analyze the momentary liquefactions of the seabed. In the numerical analysis, viscous-elastic artificial boundary was set up in the FEM model to simulate the transmission of seismic waves, which reproduced more realistically the dynamic response of the seabed along submarine pipelines under seismic loading.

关 键 词：海底管线 超孔隙水压力 瞬时液化 地震荷载 

分 类 号：TU279.76[建筑科学—建筑设计及理论]