【摘要】：針對黃土遇水后濕陷產(chǎn)生陷穴并引起埋地管道懸空這一過程中管道的力學(xué)行為,以基于彈塑性地基的黃土濕陷區(qū)懸空管道力學(xué)模型為基礎(chǔ),從濕陷原因和機(jī)理出發(fā),建立三維有限元實(shí)體模型,模擬了土體濕陷過程和沉降變形,模擬計(jì)算結(jié)果與理論值和實(shí)測值進(jìn)行了比對驗(yàn)證;進(jìn)一步的計(jì)算和回歸分析得到了管道最大位移、最大von Mises應(yīng)力與地表土體濕陷沉降量的變化規(guī)律,同時(shí)也得到了最終濕陷情況下管道的von Mises應(yīng)力分布和濕陷區(qū)范圍的影響。結(jié)果表明:土體濕陷沉降是管道和土體共同作用的結(jié)果,濕陷前期管道與土體一起運(yùn)動,位移和應(yīng)力增加較快,而管道下方土體脫離管道產(chǎn)生陷穴后則增長較慢;管道最大位移和土體濕陷沉降量間呈對數(shù)函數(shù)關(guān)系,而管道最大von Mises應(yīng)力和土體濕陷量呈指數(shù)函數(shù)關(guān)系;濕陷區(qū)管段向下彎曲變形會在3個位置形成應(yīng)力集中區(qū),濕陷區(qū)范圍增大會引起管道應(yīng)力和變形的明顯增加,且3個區(qū)域的最值分布有所不同。
[Abstract]:In view of the mechanical behavior of pipeline in the process of collapsing loess collapsing and causing buried pipeline to hang, based on the mechanical model of suspended pipeline in loess collapsible area based on elasto-plastic foundation, the reason and mechanism of collapsibility are analyzed. A three-dimensional finite element solid model is established to simulate the process of soil collapsibility and settlement, and the calculated results are compared with the theoretical values and the measured values. Further calculation and regression analysis obtained the variation rule of maximum displacement, maximum von Mises stress and collapsible settlement of surface soil. At the same time, the distribution of von Mises stress and the range of collapsible zone of pipeline under final collapsibility were also obtained. The results show that the wet settlement of soil mass is the result of the joint action of pipeline and soil. The displacement and stress increase rapidly with the pipeline moving together with the soil in the early stage of collapsibility, but the increase of soil mass under the pipe is slower after the collapse occurs when the pipe is separated from the pipe. There is a logarithmic function relationship between the maximum displacement of the pipeline and the settlement of the soil mass, while the relationship between the maximum von Mises stress of the pipeline and the amount of the collapsibility of the soil is exponential. The downward bending deformation of pipe segment in collapsible zone will form stress concentration zone in three locations. The increase of collapsible zone will result in obvious increase of pipe stress and deformation, and the distribution of the maximum value of the three regions will be different.
【作者單位】： 西南石油大學(xué)土木工程與建筑學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(5974105) 中國工程院重大咨詢研究項(xiàng)目(2011-ZD-20) 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金(20105121110003)
【分類號】：TE973

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