本文選題：砂卵石地層 + 鄰近結(jié)構(gòu)物　； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：結(jié)構(gòu)物隔斷保護(hù)作為一種臨時(shí)的施工保護(hù)措施,其設(shè)計(jì)帶有很大的經(jīng)驗(yàn)性,在施工前對其保護(hù)效果也存在著較大的不確定性。因此,對盾構(gòu)鄰近結(jié)構(gòu)物施工隔斷保護(hù)研究將具有重要的現(xiàn)實(shí)意義。本論文依托長沙地鐵砂卵石地層盾構(gòu)穿越新中路立交橋L匝道工程,采用現(xiàn)場監(jiān)測及數(shù)值分析手段,研究了長沙地鐵砂卵石地層盾構(gòu)施工地表沉降特征,針對所穿越既有構(gòu)筑物特點(diǎn)進(jìn)行盾構(gòu)緊鄰橋樁施工隔斷保護(hù)研究。本文主要研究內(nèi)容和成果如下： (1)結(jié)合盾構(gòu)側(cè)穿新中路立交橋L匝道工程地質(zhì)條件和環(huán)境條件,對其施工風(fēng)險(xiǎn)進(jìn)行了系統(tǒng)的分析。由于本工程不確定風(fēng)險(xiǎn)因素較多,施工風(fēng)險(xiǎn)高,為保證上部結(jié)構(gòu)安全,提出了旋噴樁加固隔斷保護(hù)的風(fēng)險(xiǎn)控制措施； (2)分析了長沙地鐵砂卵石地層地質(zhì)條件,歸納總結(jié)了砂卵石地層盾構(gòu)施工地表沉降特征及優(yōu)化掘進(jìn)參數(shù),為今后類似盾構(gòu)施工提供參考；采用位移控制有限元法(DCM法),研究了砂卵石地層盾構(gòu)施工地層變形特性,并將計(jì)算結(jié)果與現(xiàn)場實(shí)測數(shù)據(jù)進(jìn)行對比,驗(yàn)證了DCM法的合理性和準(zhǔn)確性； (3)通過對隔斷結(jié)構(gòu)的作用機(jī)理和對隧道開挖地層變形影響規(guī)律進(jìn)行研究,得到了隔斷結(jié)構(gòu)的主要設(shè)計(jì)參數(shù)(剛度EI、隔斷范圍tanφ、嵌入深度h1)對隔離效果的影響規(guī)律,為隔斷結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供依據(jù)；對長沙常見上軟下硬地層與均勻地層進(jìn)行了隔斷效果對比,分析了隔斷結(jié)構(gòu)的地層適用性； (4)選取側(cè)穿新中路橋樁中風(fēng)險(xiǎn)較高斷面,采用Ansys三維數(shù)值模型,研究了有無旋噴樁隔斷時(shí)盾構(gòu)隧道開挖對鄰近樁基變形和內(nèi)力的影響,分析旋噴樁加固隔斷保護(hù)效果。同時(shí),結(jié)合地中水平位移、地表沉降和地下水位監(jiān)測,驗(yàn)證了旋噴樁加固隔斷保護(hù)的有效性。圖99幅,表29個(gè),參考文獻(xiàn)90篇。
[Abstract]:The structure partition protection is a temporary construction protection measure, its design has a great empiricism, and there is a great uncertainty in the protection effect before construction. Therefore, it is of great practical significance to study the protection of the construction partition of the adjacent structure of the shield. This paper relies on the shield crossing of the sand gravel stratum in Changsha Metro. In the L ramp project of Xinzhong Road overpass, the ground subsidence characteristics of the shield construction in Changsha subway sand gravel stratum are studied by means of field monitoring and numerical analysis. The main research contents and results are as follows:
(1) combined with the engineering geological conditions and environmental conditions of the L ramp of the new Middle Road overpass on the side of the shield, the construction risk was systematically analyzed. The risk control measures were put forward because the project was uncertain and the risk factors were more, the construction risk was high, and the safety of the superstructure was ensured.
(2) the geological conditions of sand pebble formation in Changsha subway are analyzed, the characteristics of ground settlement and optimization of tunneling parameters are summarized, which provide reference for the similar shield construction in the future. The displacement control finite element method (DCM method) is used to study the deformation characteristics of the shield construction in sand gravel stratum, and the calculation results are compared with the site. Comparing the measured data, the rationality and accuracy of the DCM method are verified.
(3) through the study of the action mechanism of the partition structure and the law of the influence of the tunnel excavation on the formation deformation, the influence rules of the main design parameters (stiffness EI, partition Tan phi, embedded depth H1) on the isolation effect are obtained, which provide the basis for the optimization of the partition structure, and the common upper soft under the hard strata and the uniformity in Changsha. The effect of the partition is compared, and the applicability of the partition structure is analyzed.
(4) select the high risk section in the side of the new middle road bridge pile, and use the Ansys three-dimensional numerical model to study the influence of the shield tunnel excavation on the deformation and internal force of the adjacent pile foundation when the non rotating jet pile is separated, and analyze the protective effect of the rotary spraying pile to reinforce the partition. Meanwhile, the horizontal displacement in the ground, the surface settlement and the monitoring of the groundwater level are used to verify the jet grouting pile. The effectiveness of reinforced partition protection is shown in Figure 99, table 29, and 90 references.

【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】：U231.3;U455.43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 翟杰群;賈堅(jiān);謝小林;;隔離樁在深基坑開挖保護(hù)相鄰建筑中的應(yīng)用[J];地下空間與工程學(xué)報(bào);2010年01期

2 羅桂東;;注漿技術(shù)和樹根樁法加固橋梁樁基[J];城市道橋與防洪;2006年02期

3 李建設(shè),杜朋,鄒志利;隔離樁工作機(jī)理及在設(shè)計(jì)中的應(yīng)用[J];低溫建筑技術(shù);1999年02期

4 李德勝;李大勇;;盾構(gòu)機(jī)下穿樁基施工對單樁承載力影響的數(shù)值研究[J];工程地質(zhì)學(xué)報(bào);2009年02期

5 石舒;;隔離樁施工對鄰近高鐵高架橋樁基的變形影響分析[J];世界橋梁;2012年05期

6 李立;;地鐵區(qū)間隧道穿越建筑物基礎(chǔ)的保護(hù)方案探討[J];隧道建設(shè);2008年06期

7 熊興國;;北京地鐵區(qū)間隧道淺埋暗挖法穿越高層建筑物施工技術(shù)[J];鐵道標(biāo)準(zhǔn)設(shè)計(jì);2007年05期

8 王吉華;;土壓平衡盾構(gòu)下穿小跨徑鋼筋混凝土連續(xù)梁橋綜合施工技術(shù)[J];鐵道建筑技術(shù);2012年07期

9 陳書文;吳二林;陳飛;;盾構(gòu)隧道側(cè)穿建筑物對其樁基的影響分析——以武漢地鐵8號線為例[J];人民長江;2013年03期

10 項(xiàng)彥勇,賀少輝,張彌,崔志杰,馬鎖柱;導(dǎo)洞隔離樁墻結(jié)構(gòu)對淺埋暗挖隧道周邊地層移動的限制作用[J];巖石力學(xué)與工程學(xué)報(bào);2004年19期

相關(guān)博士學(xué)位論文 前1條

1 周正宇;地鐵鄰近既有橋梁施工影響分析及主動防護(hù)研究[D];北京交通大學(xué);2012年

，

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