【摘要】：隨著海洋油氣資源的勘探開發(fā)邁向深水和超深水海域,對海底油氣管道也提出了更高的要求。傳統(tǒng)的單層海底管道由于浮重度較大,絕熱性能較差,已不適合應(yīng)用于于深水和超深水海域。夾層管復(fù)合結(jié)構(gòu)是近年才發(fā)展起來的海底管束技術(shù),在深海油氣資源開發(fā)和輸運中具有顯著的優(yōu)勢。深水海底管道在安裝和服役期間,需要承受巨大的外部靜水壓力和不同程度的彎曲作用,同時材料非線性和幾何非線性的存在使得管道受力更為復(fù)雜。深海高壓環(huán)境容易誘發(fā)管道發(fā)生局部屈曲,在靜水壓力作用下屈曲將沿管道軸向傳播,導(dǎo)致整條管道發(fā)生失穩(wěn)破壞,造成重大的經(jīng)濟損失和生態(tài)影響。因此,開展深海夾層管復(fù)合結(jié)構(gòu)非線性屈曲失穩(wěn)機理研究具有重大的工程意義。 本文采用具有較高結(jié)構(gòu)強度和良好保溫絕熱性能的聚丙烯作為夾芯層材料,通過試驗測得聚丙烯夾芯層與內(nèi)外鋼管之間的粘結(jié)特性,考慮不同的層間粘結(jié)性能,分別對夾層管在外壓和彎曲作用下的屈曲失穩(wěn)進行了精確的數(shù)值模擬分析,主要研究工作概述為以下幾個方面： (1)夾層管層間粘結(jié)性能試驗研究。通過單軸拉伸試驗和單軸壓縮試驗測得聚丙烯材料的應(yīng)力應(yīng)變關(guān)系曲線,設(shè)計不同的試驗方案分別研究夾層管層間環(huán)向粘結(jié)性能和軸向粘結(jié)性能,探究了不同黏結(jié)劑和接觸面粗糙程度對層間粘結(jié)性能的影響。 (2)外壓作用下夾層管非線性屈曲失穩(wěn)研究。將外壓作用下夾層管的屈曲失穩(wěn)簡化為平面應(yīng)變問題,運用有限元分析軟件ABAQUS建立了相應(yīng)的數(shù)值模型,采用節(jié)點間非線性彈簧模擬夾芯層與內(nèi)外管之間的粘結(jié)性能,通過廣泛的參數(shù)化分析,研究了層間粘結(jié)性能、鋼管初始幾何缺陷、截面幾何構(gòu)型以及材料特性等因素對夾層管屈曲失穩(wěn)的影響。 (3)純彎作用下夾層管非線性屈曲失穩(wěn)研究。建立了夾層管在純彎作用下的三維數(shù)值模型,通過一系列的參數(shù)敏感性分析,研究了管道長度、層間粘結(jié)性能、截面幾何構(gòu)型以及材料特性等因素對夾層管屈曲失穩(wěn)的影響。 研究結(jié)果表明,無論是外壓,還是彎曲作用下,夾層管的屈曲性能相比傳統(tǒng)單層管都有較大幅度的提升；外壓作用下,層間粘結(jié)性能對夾層管屈曲性能影響較大,而彎曲作用下,層間粘結(jié)性能對夾層管屈曲性能影響較��；夾層管截面幾何構(gòu)型以及內(nèi)外管材料特性對夾層管屈曲性能影響較為顯著。
[Abstract]:With the exploration and development of offshore oil and gas resources moving into deep and ultra deep water areas, higher requirements for submarine oil and gas pipelines have been put forward. The traditional single-layer submarine pipeline is not suitable for deep water and ultra deep water because of its large floating degree and poor adiabatic performance. Sandwich pipe composite structure is a kind of submarine pipe bundle technology developed in recent years. It has obvious advantages in the exploitation and transportation of deep sea oil and gas resources. During the installation and service of deep-water submarine pipeline, it is necessary to bear huge external hydrostatic pressure and varying degrees of bending, and the existence of material nonlinearity and geometric nonlinearity makes the pipeline force more complicated. The deep sea high pressure environment can easily induce the local buckling of the pipeline, and the buckling will propagate along the pipeline axis under hydrostatic pressure, resulting in the instability of the whole pipeline, resulting in significant economic losses and ecological effects. Therefore, it is of great engineering significance to study the nonlinear buckling failure mechanism of deep sea sandwich tube composite structure. In this paper, polypropylene with high structural strength and good thermal insulation property is used as sandwich layer material. The bonding characteristics between sandwich layer and inner and outer steel pipe are measured by experiments, and different interlaminar bonding properties are considered. The buckling instability of sandwich tube under external pressure and bending is analyzed by numerical simulation. The main research work is summarized as follows: (1) Experimental study on interlaminar bond behavior of sandwich tube. The stress-strain curves of polypropylene were measured by uniaxial tensile test and uniaxial compression test. The effects of different binders and roughness of contact surface on interlaminar bond properties were investigated. (2) nonlinear buckling instability of sandwich tubes under external pressure was investigated. The buckling instability of sandwich tube under external pressure is simplified as a plane strain problem. The corresponding numerical model is established by using the finite element analysis software ABAQUS, and the bond performance between the sandwich layer and the inner and outer tube is simulated by nonlinear spring between the nodes. Based on the extensive parametric analysis, the interlaminar bond properties and initial geometric defects of the steel pipe are studied. The effect of geometric configuration and material characteristics on buckling instability of sandwich tubes. (3) nonlinear buckling instability of sandwich tubes under pure bending. The three-dimensional numerical model of sandwich tube under pure bending is established. Through a series of parameter sensitivity analysis, the influence of pipe length, interlaminar bond property, section geometry configuration and material characteristics on buckling instability of sandwich tube is studied. The results show that the buckling behavior of the sandwich tube is much higher than that of the traditional single-layer tube under the external pressure and bending, and the interlaminar bond property has a great influence on the buckling performance of the sandwich tube. However, the effect of interlaminar bonding on the buckling behavior of sandwich tube is small, and the geometric configuration of sandwich tube section and the characteristics of inner and outer tube material have a significant effect on the buckling performance of sandwich tube.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE973

【參考文獻】

相關(guān)期刊論文 前2條

1 李志剛;王琮;何寧;趙冬巖;;An Overview of Deepwater Pipeline Laying Technology[J];China Ocean Engineering;2008年03期

2 趙天奉;段夢蘭;潘曉東;;剛性連接雙層海底管道高溫側(cè)向屈曲分析方法研究[J];海洋工程;2008年03期

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本文編號：2185623