【摘要】：隨著城市地下空間開發(fā)的不斷深入,許多基坑出現(xiàn)在建筑物密集區(qū),當(dāng)深基坑工程附近存在建筑物樁基礎(chǔ)同步施工或工序交錯(cuò)施工,尤其是在建建筑物離深基坑很近時(shí),進(jìn)行基坑設(shè)計(jì)既要考慮鄰近建筑物樁基礎(chǔ)加載對(duì)基坑的影響,又要考慮基坑開挖對(duì)鄰近建筑物的影響,在此條件下,研究深基坑施工與鄰近群樁基礎(chǔ)加載的相互影響關(guān)系,具有一定的現(xiàn)實(shí)意義和實(shí)用價(jià)值。本文依托的成綿樂(lè)客運(yùn)專線雙流機(jī)場(chǎng)站深基坑開挖深度為20.2m,最大基坑開挖寬度為55.2m,其與鄰近在建的T2航站樓斜拱群樁基礎(chǔ)承臺(tái)邊凈距僅14.8m,而且斜拱承臺(tái)落拱時(shí)承臺(tái)還受到高達(dá)12160kN的指向基坑的橫向水平力。以此為工程背景,本文采用巖土有限元數(shù)值分析、解析分析和施工監(jiān)測(cè)資料分析相結(jié)合的方法,對(duì)深基坑施工與鄰近群樁基礎(chǔ)加載的相互影響進(jìn)行研究分析。本文的研究課題主要涵蓋以下幾個(gè)方面的內(nèi)容：首先,采用巖土有限元軟件對(duì)基坑開挖至不同深度進(jìn)行群樁基礎(chǔ)加載時(shí)基坑和群樁基礎(chǔ)的應(yīng)力場(chǎng)和位移場(chǎng)分別進(jìn)行數(shù)值分析,在數(shù)值分析計(jì)算結(jié)果的基礎(chǔ)上,分別對(duì)圍護(hù)樁和群樁基礎(chǔ)的水平位移、圍護(hù)樁土壓力以及圍護(hù)樁和群樁基礎(chǔ)彎矩進(jìn)行分析,從而得到基坑開挖至不同深度進(jìn)行群樁基礎(chǔ)加載的各種計(jì)算條件下圍護(hù)樁和群樁基礎(chǔ)的變形和受力特點(diǎn)。然后,在上述研究的基礎(chǔ)上,對(duì)基坑開挖至不同深度群樁基礎(chǔ)加載的基坑和群樁基礎(chǔ)的水平位移、圍護(hù)樁土壓力以及圍護(hù)樁和群樁基礎(chǔ)彎矩分別進(jìn)行對(duì)比分析,進(jìn)而研究不同開挖深度進(jìn)行群樁基礎(chǔ)加載時(shí)群樁基礎(chǔ)加載對(duì)基坑圍護(hù)樁身位移、彎矩和圍護(hù)樁土壓力的影響以及基坑開挖對(duì)鄰近群樁基礎(chǔ)位移及彎矩的影響。從而得到深基坑施工和鄰近群樁基礎(chǔ)加載的相互影響規(guī)律。最后,將數(shù)值計(jì)算結(jié)果與現(xiàn)場(chǎng)監(jiān)測(cè)資料(主要包括圍護(hù)樁水平位移、承臺(tái)頂水平位移和圍護(hù)樁身彎矩)進(jìn)行對(duì)比分析,以驗(yàn)證采用數(shù)值分析方法進(jìn)行分析和計(jì)算的合理性和可靠性。
[Abstract]:With the deepening of the development of urban underground space, many foundation pit appear in the dense building area, when there is synchronous construction of building pile foundation or staggered construction of working procedure near the deep foundation pit project, especially when the building is very close to the deep foundation pit. In the design of foundation pit, not only the influence of pile foundation loading on foundation pit of adjacent buildings should be considered, but also the influence of foundation pit excavation on adjacent buildings should be considered. under this condition, the interaction between deep foundation pit construction and loading of adjacent pile group foundation should be studied. It has certain practical significance and practical value. In this paper, the excavation depth of deep foundation pit of Shuangliu Airport Station of Chengmianle passenger dedicated Line is 20.2m, the maximum excavation width of foundation pit is 55.2 m, and the net distance between the foundation platform of oblique arch pile group and the adjacent T2 terminal is only 14.8m. Moreover, when the inclined arch cap falls, the cap is also subjected to the horizontal force pointing to the foundation pit as high as 12160kN. Taking this as the engineering background, this paper uses the method of geotechnical finite element numerical analysis, analytical analysis and construction monitoring data analysis to study and analyze the interaction between the construction of deep foundation pit and the loading of adjacent pile group foundation. The research topic of this paper mainly covers the following aspects: firstly, the stress field and displacement field of foundation pit and pile group foundation are analyzed by using geotechnical finite element software to carry on the stress field and displacement field of foundation pit and pile group foundation when the foundation pit is excavated to different depths. On the basis of numerical analysis and calculation results, the horizontal displacement of retaining pile and pile group foundation, earth pressure of retaining pile and bending moment of retaining pile and pile group foundation are analyzed respectively. Thus, the deformation and stress characteristics of retaining pile and pile group foundation under various calculation conditions from foundation pit excavation to different depth loading of pile group foundation are obtained. Then, on the basis of the above research, the horizontal displacement of foundation pit and pile group foundation loaded from foundation pit excavation to different depth pile group foundation, the earth pressure of retaining pile and the bending moment of retaining pile and pile group foundation are compared and analyzed respectively. Furthermore, the influence of pile group foundation loading on the displacement, bending moment and earth pressure of retaining pile in foundation pit and the influence of foundation pit excavation on displacement and bending moment of adjacent pile group foundation are studied. Thus, the interaction between the construction of deep foundation pit and the loading of adjacent pile group foundation is obtained. Finally, the numerical results are compared with the field monitoring data (including the horizontal displacement of retaining pile, the horizontal displacement of cap top and the bending moment of retaining pile body). To verify the rationality and reliability of numerical analysis and calculation.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU753.3

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