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波浪引起的海底管线周围海床动力响应分析

ISSN号：1000-6915
期刊名称：岩石力学与工程学报
时间：0
页码：789-795
语言：中文
分类：TU279.76[建筑科学—建筑设计及理论]
作者机构：[1]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, [2]大连理工大学土木水利学院,辽宁大连116024
相关基金：国家自然科学基金重点项目（50439010）教育部科学技术研究重大项目（合同号305003）;国家自然科学基金资助项目（50579006）
相关项目：海洋土的工程特性及其地基的变形机理研究

关键词：工业建筑, 海底管线, 海床–管线相互作用, 超静孔隙水压力, 波浪荷载, industrial construction, submarine pipeline, seabed-pipeline interaction, excess pore water pressure, wave loading

中文摘要：

在目前的海床–管线相互作用问题研究中,管线与海床交界面一般假定为不可滑动,没有考虑海床–管线接触效应,同时也没有考虑土体和管线加速度效应对海床动力响应的惯性影响,同工程实际情况存在较大差异。为此,分别基于Biot动力固结理论和弹性动力学理论列出海床和海底管线的控制方程,进而根据摩擦接触理论考虑海床与管线之间的相互作用效应,建立海床–管线相互作用的有限元计算模型。根据计算发现,海床–管线接触效应对管线附近海床中的有效应力影响显著,不同的管沟形状对海床中由波浪所引起的超静孔隙水压力及有效应力影响显著。

英文摘要：

The evaluation of wave-induced excess pore water pressure and effective stresses are recognized as an important factor in the design of submarine pipelines. In most previous investigations for the seabed-pipeline interaction, the effect of pipeline on dynamic response of seabed has been usually ignored; and nonslip condition is mainly assumed at the interface between pipeline and seabed soils. The effect of full interaction between seabed and pipeline has not been considered in the analyses of stresses and deformations of the seabed and submarine pipeline. Furthermore, the inertia effects of both accelerations of seafloor soils and pipeline on response of seabed have not been taken into account in most previous investigations. The governing equations of the seabed and pipeline are formulated respectively based on the Biot＇s theory of dynamic consolidation of two-phase media and principle of elastic dynamics. The seabed-pipeline interaction problem is investigated by using the friction contact theory; and numerical formulations based on FEM are established. Based on the computed results, it is found that the soil-pipeline interaction plays an important role in effect stresses of the seabed around pipeline; and the wave-induced excess pore water pressure along the pipeline surface is significantly affected by the shape of the trench layer in the vicinity of the bottom of the pipeline.

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