【摘要】：在城市中修建隧道如何減少施工對地表既有敏感結(jié)構(gòu)物造成的擾動影響及損害,一直是困擾相關(guān)研究人員的難題之一。為此本文結(jié)合鐵道部課題“長株潭城際鐵路湘江隧道施工關(guān)鍵技術(shù)研究”(2011G013-C),以長株潭城際鐵路隧道穿越西二環(huán)立交橋、熙源酒店、品格小區(qū)項目為依托,展開雙洞暗挖穿越敏感結(jié)構(gòu)物的擾動效應(yīng)及安全控制技術(shù)研究,主要內(nèi)容如下： (1)闡述了淺埋暗挖隧道對地層沉降的擾動機理及規(guī)律特征,以樁的荷載傳遞原理為基礎(chǔ),推導(dǎo)了荷載傳遞法的基本微分方程,并采用有限差分法推導(dǎo)出了受隧道開挖擾動影響樁身各節(jié)點的豎向及水平向位移方程； (2)采用FLAC3D數(shù)值計算軟件對雙洞暗挖隧道穿越西二環(huán)立交橋進行數(shù)值模擬分析,同時考慮了隧道超前注漿以及錨桿、鋼拱架等洞內(nèi)加固措施,并對比分析了全斷面法、三臺階法、環(huán)形開挖預(yù)留核心土法對西二環(huán)立交橋擾動效應(yīng)的差別,而且將數(shù)值計算結(jié)果與現(xiàn)場實際監(jiān)測數(shù)據(jù)進行了對比分析； (3)在對雙洞暗挖隧道穿越品格小區(qū)進行數(shù)值模擬時,不僅考慮了隧道超前加固措施和洞內(nèi)加固措施,還考慮了隔離樁對品格小區(qū)高層住宅樓的保護作用,并對比分析了全斷面法、三臺階法數(shù)值計算結(jié)果與實際量測結(jié)果的差別； (4)模擬雙洞暗挖隧道下穿熙源酒店時,考慮了熙源酒店位于邊坡附近的特殊地形條件,加入了實際施工中建造的擋土墻、隔離樁等加固措施,對比分析了全斷面法、三臺階法數(shù)值計算結(jié)果與實際量測結(jié)果的差別。
[Abstract]:How to reduce the disturbance effect and damage caused by the construction of tunnel in the city is always one of the difficult problems that puzzles the relevant researchers. For this reason, this paper combines the project of the Ministry of Railways, "Research on key Technology of Xiangjiang Tunnel Construction of Chang-Zhu-Tan Intercity Railway" (2011G013-C), relying on the project of Chang-Zhu-Tan Intercity Railway Tunnel crossing the overpass of the second West Ring Road, Xiyuan Hotel and character District. The main contents are as follows: (1) the disturbance mechanism and law characteristics of shallow-buried tunnel to ground settlement are expounded, and the disturbance effect and safety control technology of double-hole tunneling through sensitive structure are studied as follows: (1) the disturbance mechanism and law characteristics of shallow-buried tunnel to ground settlement are described. Based on the principle of pile load transfer, the basic differential equation of load transfer method is derived, and the vertical and horizontal displacement equations of each node affected by tunnel excavation are derived by using finite difference method. (2) the FLAC3D software is used to simulate and analyze the double-tunnel crossing the Xi-er-Huan overpass. At the same time, the tunnel pre-grouting and reinforcement measures such as anchor rod and steel arch frame are taken into account, and the whole section method is compared and analyzed. The three-step method and the ring excavation reserved core soil method are used to analyze the disturbance effect of the west-second ring interchange bridge, and the numerical results are compared with the actual monitoring data in the field. (3) in the numerical simulation of the double-tunnel tunneling through the character district, not only the advance reinforcement measures and the reinforcement measures inside the tunnel are considered, but also the protective effect of isolation piles on the high-rise residential buildings in the character district is considered. The differences between the numerical results of the total section method, the three-step method and the actual measurement results are compared and analyzed. (4) when simulating the double-hole tunnel under Xiyuan Hotel, taking into account the special terrain condition of Xiyuan Hotel near the slope, the reinforcement measures such as retaining wall and isolation pile built in the actual construction are added, and the whole section method is compared and analyzed. The difference between the numerical calculation results of the three-step method and the actual measurement results.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.4

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