本文選題：深基坑 + 空間效應(yīng)�。� 參考：《遼寧工程技術(shù)大學(xué)》2014年碩士論文

【摘要】：地鐵車站深基坑圍護(hù)結(jié)構(gòu)設(shè)計(jì)及其變形規(guī)律的研究是地鐵車站建設(shè)過程中最重要的環(huán)節(jié)之一,因此,對(duì)地鐵車站深基坑在開挖過程中變形規(guī)律的研究具有重要的工程應(yīng)用價(jià)值。本文運(yùn)用三維有限差分軟件FLAC3D,考慮基坑開挖過程中存在時(shí)空效應(yīng),對(duì)徐州地鐵車站深基坑開挖過程進(jìn)行模擬,分析每層土體開挖后基坑底部土體回彈、基坑周圍土體沉降、內(nèi)支撐軸力、圍護(hù)結(jié)構(gòu)側(cè)移的變化規(guī)律,并將模擬結(jié)果與現(xiàn)場(chǎng)監(jiān)測(cè)結(jié)果相對(duì)比,得出：基坑底部土體回彈沿基坑寬度方向呈對(duì)稱分布,隨開挖深度增加,回彈形式由均勻回彈變成中間大兩邊��；基坑周圍地表沉降曲線形狀呈拋物線型,且最大地表沉降值發(fā)生在距離基坑邊緣約1倍開挖深度位置處,隨著基坑開挖深度的增加,沉降值逐漸增大,最大沉降點(diǎn)有向外移動(dòng)現(xiàn)象；斜撐軸力隨著斜撐長(zhǎng)度增加而增大,且斜撐軸力明顯小于直撐軸力,直撐軸力的最大值出現(xiàn)在基坑中部范圍內(nèi)；基坑擋土墻側(cè)移總體變化趨勢(shì)是兩頭小中間大,隨著基坑開挖深度的增加側(cè)移量也增加,在第2、3道支撐設(shè)置后,擋土墻的水平側(cè)移量繼續(xù)增加,但增加幅值明顯減小；隨著開挖層厚度的增加,基坑周圍土體沉降和圍護(hù)結(jié)構(gòu)變形也隨之增加,但隨著開挖段寬度的增加,周圍土體沉降減少而圍護(hù)結(jié)構(gòu)側(cè)移量增大,二者成此消彼長(zhǎng)的關(guān)系。
[Abstract]:The design of the retaining structure and the deformation law of the deep foundation pit of the subway station is one of the most important links in the construction of the subway station. Therefore, the study on the deformation law of the deep foundation pit of the subway station during the excavation process has important engineering application value. In this paper, the three-dimensional finite-difference software FLAC3D is used to simulate the excavation process of the deep foundation pit of Xuzhou Metro Station, considering the space-time effect in the excavation process of the foundation pit, and to analyze the springback of the soil at the bottom of the foundation pit after each layer of soil is excavated, and the settlement of the soil around the foundation pit. By comparing the simulation results with the field monitoring results, it is concluded that the springback of the soil in the bottom of the foundation pit is symmetrically distributed along the width of the foundation pit and increases with the depth of excavation. The shape of the surface settlement curve around the foundation pit is parabola, and the maximum surface settlement occurs at the position of about 1 times the excavation depth from the edge of the foundation pit, and with the increase of the excavation depth of the foundation pit, the springback form is changed from uniform springback to the middle big and small, and the shape of the surface settlement curve around the foundation pit is parabola. The settlement value increases gradually, the maximum settlement point moves outward, the axial force of inclined brace increases with the increase of inclined brace length, and the axial force of oblique brace is obviously smaller than that of straight brace, and the maximum axial force of straight brace appears in the middle of foundation pit. The overall trend of lateral displacement of retaining wall of foundation pit is large in the middle of two ends, and the amount of lateral displacement also increases with the increase of excavation depth. The horizontal lateral displacement of retaining wall continues to increase, but the amplitude of increase decreases obviously after the installation of the second third support. With the increase of the thickness of the excavation layer, the settlement of the soil and the deformation of the surrounding structure also increase, but with the increase of the width of the excavation section, the settlement of the surrounding soil decreases and the lateral displacement of the surrounding structure increases.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU753

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