【摘要】：目前,我國主要一線城市均建有城市地下綜合管廊。建設(shè)地下綜合管廊,利于維修和管理各類城市管線、節(jié)約城市建設(shè)空間、美化城市景觀,是提升城市生活品位的必由之路。在城市化發(fā)展的同時,城市人口和城市管線逐漸增多。人們對地下城市綜合管廊的使用功能和需求日益增大,地下綜合管廊的結(jié)構(gòu)尺寸越來越大、斷面形式越來越復(fù)雜、施工難度越來越高,對當(dāng)前新型結(jié)構(gòu)地下綜合管廊施工的研究有所裨益。本文以鄭州市中原區(qū)多層多艙結(jié)構(gòu)地下綜合管廊工程為工程實(shí)例,使用ABAQUS有限元軟件建立了土體、支護(hù)結(jié)構(gòu)、管廊主體結(jié)構(gòu)共同作用的三維有限元計算模型。對該工程的基坑開挖和支護(hù)、管廊主體澆筑、基坑回填三個施工階段進(jìn)行數(shù)值分析計算。研究了基坑受力變形機(jī)理,并把計算結(jié)果與現(xiàn)場監(jiān)測數(shù)據(jù)對比分析;在管廊澆筑和基坑回填過程中管廊結(jié)構(gòu)變形和應(yīng)力變化,并對管廊主體結(jié)構(gòu)進(jìn)行可靠度分析。研究成果可為類似工程的施工和設(shè)計提供參考。研究結(jié)果表明:(1)數(shù)值計算結(jié)果與現(xiàn)場實(shí)測結(jié)果表現(xiàn)出較好的一致性,說明本文建立的有限元計算模型、各材料本構(gòu)模型和計算參數(shù)的選取是恰當(dāng)?shù)?數(shù)值計算結(jié)果在一定程度上能反映基坑開挖過程的變形規(guī)律。(2)基坑整體變形呈“凸”型,土體由坑內(nèi)向坑外隆起,基底土體上涌、基壁向兩外側(cè)偏移。在基坑開挖的前期基坑變形不明顯,在進(jìn)行三級放坡開挖時,基坑變形明顯增大。(3)地表最大沉降不在基坑邊坡頂部,因噴錨支護(hù)體系作用,錨釘?shù)墓渴羌茏饔眉庸塘嘶舆吰峦馏w,使得距離基坑邊坡頂部較近位置處沉降較小。(4)在管廊主體澆筑階段,基坑穩(wěn)定性良好。管廊夾層頂板中間部位處變形最大,方向向下。(5)隨著基坑回填施工進(jìn)行,管廊應(yīng)力和變形逐漸增大。基坑回填高度大于管廊高度后,對下層管廊應(yīng)力和變形的影響減小。(6)在管廊混凝土強(qiáng)度和撓度控制條件下,管廊結(jié)構(gòu)可靠度均在安全適用范圍之內(nèi)。
[Abstract]:At present, China's main first-line cities have built urban underground comprehensive pipe gallery. It is the only way to improve the quality of city life by constructing underground comprehensive pipe gallery, which is conducive to the maintenance and management of all kinds of urban pipelines, saves urban construction space and beautifies the city landscape. With the development of urbanization, urban population and urban pipelines are increasing gradually. The use function and demand of underground integrated pipe gallery are increasing day by day. The structure size of underground integrated pipe gallery is becoming larger and larger, the section form is more and more complex, and the construction is more and more difficult. It is beneficial to the study of the construction of the new structure underground comprehensive pipe gallery. In this paper, a three-dimensional finite element model for the interaction of soil mass, support structure and main structure of pipe gallery is established by using ABAQUS finite element software, taking the underground comprehensive pipe gallery project of multi-storey and multi-cabin structure in Zhongyuan District of Zhengzhou City as an engineering example. The excavation and support of the foundation pit, the main pouring of the pipe gallery and the backfilling of the foundation pit are numerically analyzed and calculated. The stress deformation mechanism of foundation pit is studied, and the calculated results are compared with the field monitoring data, and the deformation and stress changes of pipe gallery structure during the process of pipe gallery construction and foundation pit backfilling are analyzed, and the reliability of the main structure of pipe gallery is analyzed. The research results can provide reference for the construction and design of similar projects. The results show that: (1) the numerical results are in good agreement with the field measured results, which indicates that the finite element calculation model, the constitutive model of each material and the selection of calculation parameters are appropriate. The numerical results can reflect the deformation law of the excavation process to some extent. (2) the whole deformation of the foundation pit is "convex", the soil is uplifted from the pit to the outside of the pit, the foundation soil is upwelled, and the foundation wall is shifted to the two sides. In the early stage of excavation, the deformation of foundation pit is not obvious, and the deformation of foundation pit is obviously increased during the third stage of excavation. (3) the maximum surface settlement is not at the top of the slope of foundation pit, because of the effect of shotcrete anchor support system. The hoop skeleton of anchor nail strengthened the soil of the slope of foundation pit, which made the settlement smaller near the top of the slope. (4) the stability of foundation pit was good in the main pouring stage of pipe gallery. The deformation of the middle part of the pipe gallery sandwich roof is the largest and the direction is downward. (5) with the foundation pit backfilling construction, the stress and deformation of the pipe gallery gradually increase. When the backfill height of foundation pit is higher than the height of pipe gallery, the influence on stress and deformation of lower pipe gallery is reduced. (6) under the control of concrete strength and deflection of pipe gallery, the reliability of pipe gallery structure is within the safe and applicable range.
【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU990.3

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