本文選題：深大基坑　切入點：分步開挖　出處：《河北工業(yè)大學》2013年碩士論文

【摘要】：針對深大基坑開挖對鄰近歷史風貌建筑產(chǎn)生的影響，本文對天津市津灣廣場二期深大基坑工程支護體系內(nèi)力和變形及周圍土體變形的監(jiān)測成果進行整理。并采用FLAC3D分析了基坑在挖至不同深度時，地下連續(xù)墻變形、支撐軸力、樁頂變形以及坑周土體變形的規(guī)律。最后將模擬結(jié)果與實測結(jié)果進行了對比分析，預測了基坑南側(cè)歷史風貌建筑（原法國兵營）的最大水平變形值。 研究結(jié)果表明：(1)開挖完畢，基坑南側(cè)圍護墻的最大水平位移值為106.2mm，出現(xiàn)在距地表-9m深度處。開挖過程中，支撐以承受軸壓力為主，，支撐軸壓力的最大值為14230KN，出現(xiàn)在東西向?qū)蝂1-13上。地表沉降的影響范圍約為40m，約兩倍的基坑開挖深度，基坑南側(cè)地表沉降最大值為12.3mm，出現(xiàn)在距坑邊約7m處。(2)基坑變形有很強的空間性和整體性�？舆呁馏w深層水平位移場與圍護墻變形規(guī)律相似。圍護墻和樁在豎向卸荷和坑底隆起的作用下，均表現(xiàn)為先沉降后隆起的現(xiàn)象。(3)通過在不同開挖步下，模擬結(jié)果與實測結(jié)果的對比發(fā)現(xiàn)，模擬規(guī)律和實測規(guī)律基本一致，模擬值與監(jiān)測值基本吻合。(4)根據(jù)模擬值預測：挖至坑底時，基坑南側(cè)歷史風貌建筑地表處水平位移值為12.1mm；最大水平變形量為20.2mm，出現(xiàn)在距地表4m深度處。根據(jù)已有文獻，分析結(jié)果認為，津灣廣場二期基坑工程施工對南側(cè)歷史風貌建筑（原法國兵營）會產(chǎn)生一定的影響。 本文的分析結(jié)果可用于指導工程安全施工和南側(cè)歷史風貌建筑的保護。
[Abstract]:In view of the influence of deep and large foundation pit excavation on adjacent historical buildings, In this paper, the monitoring results of the internal force and deformation of the support system and the deformation of surrounding soil in the deep and large foundation pit of Tianjin Jinwan Square Phase II are sorted out, and the deformation of the underground continuous wall and the supporting axial force are analyzed by FLAC3D when the foundation pit is excavated to different depths. The law of pile top deformation and soil deformation around the pit is analyzed. Finally, the maximum horizontal deformation of historic buildings (former French Barracks) on the south side of foundation pit is predicted by comparing the simulation results with the measured results. The results show that after excavation, the maximum horizontal displacement of the retaining wall on the south side of the foundation pit is 106.2 mm, which appears at a depth of -9 m from the surface. During the excavation, the support is mainly supported by axial pressure. The maximum pressure of the supporting shaft is 14230KN, which appears on the east-west bearing Z1-13. The influence range of surface subsidence is about 40m, which is about twice the excavation depth of foundation pit. The maximum value of ground subsidence on the south side of foundation pit is 12.3 mm, which appears at about 7 m from the edge of pit.) the deformation of foundation pit has strong spatial character and integrity. The horizontal displacement field of deep soil around the pit is similar to that of retaining wall. The surrounding wall and pile are discharged vertically. Under the influence of the heave of the bottom of the pit, Through the comparison between the simulation results and the measured results, it is found that the simulation law is basically consistent with the measured law. The simulated value is basically in agreement with the monitoring value.) according to the prediction of the simulated value, the horizontal displacement of the historical landscape building on the south side of the foundation pit is 12.1mm, and the maximum horizontal deformation is 20.2mm, which appears at the depth of 4m from the ground surface. The results show that the construction of the second phase foundation pit of Jinwan Square will have a certain influence on the historical architecture (former French Barracks) on the south side. The results of this paper can be used to guide the safety construction of the project and the protection of the historic buildings on the south side.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU470;TU433

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