本文關(guān)鍵詞：地鐵隧道盾構(gòu)法施工變形及控制措施研究　出處：《南昌航空大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 隧道工程 富水砂礫石地層 地層變形 數(shù)值模擬 渣土改良

【摘要】：隨著社會經(jīng)濟(jì)迅猛發(fā)展，地上空間的開發(fā)利用已經(jīng)遠(yuǎn)遠(yuǎn)不能滿足城市發(fā)展的需要，如何更好地開發(fā)利用地下空間是解決城市交通發(fā)展瓶頸的第一要務(wù)。盾構(gòu)法以其地層適應(yīng)強、速度快、施工質(zhì)量有保證等顯著的優(yōu)點被廣泛地應(yīng)用于城市地鐵建設(shè)中，然而在盾構(gòu)掘進(jìn)施工過程中，無法避免對周圍巖體產(chǎn)生擾動，因而引發(fā)程度不同的土體變形和地層位移。因此，必需掌握盾構(gòu)施工對土體的擾動機理和范圍，分析得出擾動土體的分布規(guī)律和控制因素，才能在盾構(gòu)施工階段準(zhǔn)確預(yù)測和控制地表沉降。 本文以南昌地鐵某盾構(gòu)區(qū)間隧道工程為背景，結(jié)合有限差分軟件FLAC3D進(jìn)行數(shù)值模擬和現(xiàn)場實測方法，對地鐵隧道盾構(gòu)施工引起的地層變形進(jìn)行研究，，主要研究內(nèi)容以及取得成果有： (1)回顧了盾構(gòu)法隧道的發(fā)展及在中國的應(yīng)用現(xiàn)狀，并對盾構(gòu)隧道施工引起的地層變形預(yù)測方法進(jìn)行了概括和總結(jié)，分析了盾構(gòu)隧道施工導(dǎo)致地表沉降的機理。 (2)采用有限差分法FLAC3D能較好地模擬土壓平衡盾構(gòu)在富水砂礫石地層施工，得到計算結(jié)果與現(xiàn)場實測值較好吻合，可以應(yīng)用于實際工程進(jìn)行變形預(yù)測，以及對地層位移影響因素進(jìn)行分析。 (3)運用FLAC3D可以模擬盾構(gòu)施工引起的隧道橫向地表沉降規(guī)律和隧道縱向地表沉降規(guī)律，得出橫向地表沉降呈“V”形，從隧道中心正上方向兩邊擴散且沉降量逐漸減小；縱向地表沉降呈“S”形，離盾構(gòu)開挖面前方一定距離表現(xiàn)為隆起，開挖面后方表現(xiàn)為沉降且隨開挖深度增加而逐漸加大，最終趨于穩(wěn)定。 (4)結(jié)合實際盾構(gòu)工程進(jìn)行地表沉降監(jiān)測，在富水砂礫石地層通過添加膨潤土或者泡沫進(jìn)行渣土改良施工，使得渣土具有較好的流動性和止水性效果，利于開挖面保持穩(wěn)定，有效控制地表沉降。
[Abstract]:With the rapid development of social economy, the development and utilization of aboveground space has been far from meeting the needs of urban development. How to develop and utilize underground space better is the most important task to solve the bottleneck of urban traffic development. The obvious advantages such as guarantee of construction quality have been widely used in urban subway construction, but in the shield tunneling construction process, it is impossible to avoid disturbance to surrounding rock mass. Therefore, it is necessary to master the disturbance mechanism and scope of shield construction to soil, and to analyze the distribution law and control factors of disturbed soil. In order to accurately predict and control the surface subsidence in shield construction stage. In this paper, the ground deformation caused by shield tunneling in Nanchang Metro is studied based on the numerical simulation and field measurement method of finite difference software FLAC3D. The main contents of the study and the results achieved are as follows: 1) the development of shield tunneling and its application in China are reviewed, and the prediction methods of formation deformation caused by shield tunnel construction are summarized and summarized. The mechanism of ground subsidence caused by shield tunnel construction is analyzed. (2) the finite difference method (FLAC3D) is used to simulate the soil pressure balance shield construction in water-rich sand and gravel strata, and the calculated results are in good agreement with the field measured values. It can be applied to actual engineering to predict deformation and analyze the influencing factors of stratum displacement. 3) FLAC3D can be used to simulate the law of tunnel lateral surface subsidence and tunnel longitudinal surface subsidence caused by shield tunneling, and it is concluded that the horizontal surface subsidence is "V" shape. It diffuses from the center of the tunnel in the upper direction and the settlement decreases gradually. The longitudinal surface subsidence is "S" shape, the distance from the shield excavation surface is uplift, and the settlement behind the excavating surface is increasing gradually with the increase of excavation depth, and finally tends to be stable. In combination with the actual shield engineering, the residual soil is improved by adding bentonite or foam in the water-rich sand and gravel formation, which makes the residual soil have better fluidity and water sealing effect. 4) in combination with the actual shield engineering, the residual soil can be improved by adding bentonite or foam in the water-rich sand and gravel formation. It is propitious to keep the excavating surface stable and effectively control the surface subsidence.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43

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