【摘要】：高溫、高壓作用下不埋或淺埋的海底管線較易發(fā)生水平向整體屈曲,土體對管線的阻力決定了管線的變形形態(tài)及變形后的應(yīng)力狀態(tài),因此,確定管線受到的土體阻力對準(zhǔn)確地分析管線的整體屈曲有重要意義。開展了基于渤海砂性土體的系列室內(nèi)模型試驗(yàn),測定了不同埋深條件下管線受到的土體阻力,建立了隨埋深條件而變化的土體動(dòng)態(tài)阻力模型,揭示了埋深對土體阻力峰值和最終穩(wěn)定值的影響。由于ABAQUS內(nèi)置的罰函數(shù)接觸模型無法實(shí)現(xiàn)管-土界面的動(dòng)態(tài)摩擦特性,開發(fā)了子程序VFRIC,在管線溫-壓聯(lián)合作用下的整體屈曲分析中成功引入了建立的土體動(dòng)態(tài)阻力模型,實(shí)現(xiàn)了土體阻力大小與管線位移相關(guān)的動(dòng)態(tài)接觸特性模擬,從而較為真實(shí)地反映了管線整體屈曲過程中受到的土體阻力變化過程。研究表明,不同土體阻力模型對管線整體屈曲分析結(jié)果影響顯著,在動(dòng)態(tài)阻力模型中由于土體阻力存在峰值和衰減過程,因此計(jì)算得到的管線整體屈曲臨界軸力明顯提高,管線屈曲變形更為集中,最大彎矩和應(yīng)變也相應(yīng)增大。
[Abstract]:Under the action of high temperature and high pressure, undersea pipelines without burying or shallow burying are prone to overall horizontal buckling. The resistance of soil to pipelines determines the deformation pattern and stress state of pipelines after deformation. It is important to determine the soil resistance of pipeline to accurately analyze the overall buckling of pipeline. A series of laboratory model tests based on sand soil in Bohai Sea were carried out. The soil resistance of pipeline under different buried depth was measured, and the dynamic resistance model of soil was established with the change of buried depth. The influence of buried depth on the peak value of soil resistance and ultimate stability is revealed. Because the dynamic friction characteristics of pipe-soil interface can not be realized by the penalty function contact model built in ABAQUS, the dynamic resistance model of soil is successfully introduced into the whole buckling analysis of the subroutine VFRIC, under the combined action of pipeline temperature and pressure. The dynamic contact characteristics of soil resistance and pipeline displacement are simulated, which reflects the variation process of soil resistance in the whole buckling process of pipeline. The results show that different soil resistance models have a significant effect on the overall buckling analysis results of pipeline. In dynamic resistance model, due to the peak and attenuation process of soil resistance, the calculated critical axial force of overall buckling of pipeline is obviously increased. The buckling deformation of the pipeline is more concentrated and the maximum bending moment and strain increase accordingly.
【作者單位】： 天津大學(xué)水利工程仿真與安全國家重點(diǎn)試驗(yàn)室;中交天津港灣工程研究院有限公司;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(No.2014CB046800) 國家自然科學(xué)基金優(yōu)秀青年基金(No.51322904) 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金資助課題(No.2013032110074)
【分類號】：P756.2;TU43

【共引文獻(xiàn)】

相關(guān)博士學(xué)位論文 前2條

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相關(guān)碩士學(xué)位論文 前3條

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本文編號：2396495