本文選題：深基坑 + 鄰近建筑物　； 參考：《南京工業(yè)大學(xué)》2013年碩士論文

【摘要】：近年來，，伴隨著城市地下空間開發(fā)和軌道交通建設(shè)的發(fā)展，地鐵車站基坑工程的周邊環(huán)境條件越來越復(fù)雜，周邊鄰近建筑物的保護(hù)對基坑工程的設(shè)計(jì)施工提出了嚴(yán)峻的挑戰(zhàn)。盡管已有大量的基坑工程與周邊環(huán)境及建筑物相互影響的分析研究，但基坑開挖施工對鄰近建筑物的影響變化規(guī)律還有待進(jìn)一步的深入探討。 根據(jù)某地鐵車站工程的巖土工程勘察報告，詳細(xì)總結(jié)了該車站基坑設(shè)計(jì)施工方案、周邊交通、鄰近建筑物等情況。建立基坑開挖施工過程的精細(xì)化三維有限元模型，基坑模型土體采用Mohr-Coulomb彈塑性模型，分析了基坑開挖與支撐施工步驟對基坑變形及支護(hù)結(jié)構(gòu)的影響，得出了基坑周邊地表沉降、圍護(hù)結(jié)構(gòu)變形、坑底隆起等變形規(guī)律，總結(jié)了支撐軸力隨基坑開挖施工過程的受力變化特征。進(jìn)一步建立了基坑開挖與支護(hù)結(jié)構(gòu)施工對鄰近不同結(jié)構(gòu)型式建筑物影響的有限元模型，對基坑不同結(jié)構(gòu)型式鄰近建筑物的基礎(chǔ)沉降、上部結(jié)構(gòu)水平位移以及結(jié)構(gòu)內(nèi)力的變化進(jìn)行分析研究，總結(jié)了建筑物不同基礎(chǔ)型式的沉降與水平位移變化規(guī)律，分析了鄰近建筑物不同上部結(jié)構(gòu)的內(nèi)力變化特點(diǎn)。論文的主要結(jié)論如下： （1）基坑開挖施工步驟對基坑周邊地表土體位移、圍護(hù)結(jié)構(gòu)變形和支撐結(jié)構(gòu)內(nèi)力有明顯影響。地表沉降最大值出現(xiàn)在基坑邊緣，圍護(hù)結(jié)構(gòu)最大水平位移的出現(xiàn)位置受基坑圍護(hù)結(jié)構(gòu)空間效應(yīng)影響，支撐軸力隨基坑開挖過程有明顯變化。 （2）基坑開挖施工引起鄰近建筑物基礎(chǔ)產(chǎn)生沉降，三棟典型建筑結(jié)構(gòu)的基礎(chǔ)差異沉降均對結(jié)構(gòu)內(nèi)力沒有明顯影響，上部結(jié)構(gòu)無明顯撓曲。 （3）根據(jù)本文基坑開挖施工特點(diǎn)和鄰近建筑物特征，總結(jié)劃分了基坑開挖對鄰近建筑物基礎(chǔ)沉降影響范圍、基坑水平位移和坑底隆起影響范圍。
[Abstract]:In recent years, with the development of urban underground space development and rail transit construction, the surrounding environmental conditions of subway station foundation pit engineering are becoming more and more complex. The protection of adjacent buildings poses a severe challenge to the design and construction of foundation pit engineering. Although there have been a lot of analysis and research on the interaction between foundation pit engineering and surrounding environment and buildings, the influence of excavation construction on adjacent buildings needs to be further discussed. According to the geotechnical investigation report of a subway station project, the design and construction scheme of the foundation pit of the station, the traffic around the station, the adjacent buildings and so on are summarized in detail. The fine three-dimensional finite element model of foundation pit excavation is established. Mohr-Coulomb elastoplastic model is adopted in the foundation pit model. The influence of excavation and supporting construction procedure on foundation pit deformation and supporting structure is analyzed, and the ground subsidence around the foundation pit is obtained. The deformation law of the retaining structure and the uplift of the pit bottom are summarized, and the stress variation characteristics of the supporting axial force with the excavation process of the foundation pit are summarized. Furthermore, the finite element model of the influence of excavation and support structure construction on the adjacent buildings with different structural types is established, and the foundation settlement of the adjacent buildings with different structure types of the foundation pit is also studied. The changes of horizontal displacement and internal force of superstructure are analyzed and studied. The variation rules of settlement and horizontal displacement of different foundation types of buildings are summarized and the variation characteristics of internal forces of different superstructures in adjacent buildings are analyzed. The main conclusions are as follows: (1) the excavation procedure has a significant effect on the displacement of soil around the foundation pit, the deformation of the retaining structure and the internal force of the bracing structure. The maximum ground subsidence occurs at the edge of the foundation pit and the position of the maximum horizontal displacement of the enclosure structure is affected by the spatial effect of the foundation pit enclosure structure. The supporting axial force varies obviously with the excavation process of foundation pit. The excavation of foundation pit causes the settlement of adjacent building foundation, and the differential settlement of the foundation of three typical building structures has no obvious influence on the internal force of the structure. There is no obvious deflection of superstructure. (3) according to the characteristics of excavation and adjacent buildings, the influence range of foundation settlement, horizontal displacement of foundation pit and uplift of pit bottom are summarized and divided.
【學(xué)位授予單位】：南京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU753

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