本文選題：地鐵隧道 + 淺埋暗挖法�。� 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：近年來,我國(guó)城市發(fā)展快速,地面交通擁堵嚴(yán)重,人們也越來越重視地下空間資源的利用,各大中城市為緩解地面交通壓力而進(jìn)行地下軌道交通建設(shè)。地鐵隧道施工受地面和地下環(huán)境的限制較大,在穿越既有建筑物基礎(chǔ)附近時(shí)會(huì)導(dǎo)致基礎(chǔ)周圍土體發(fā)生位移,進(jìn)而使得樁基產(chǎn)生附加內(nèi)力和變形,導(dǎo)致上部結(jié)構(gòu)出現(xiàn)整體或不均勻沉降,從而危及橋梁和建筑物的安全使用。因此,研究地鐵淺埋暗挖法施工對(duì)既有樁基礎(chǔ)的影響,對(duì)工程施工具有重要的借鑒意義。本文對(duì)前人的研究成果進(jìn)行了總結(jié),在此基礎(chǔ)上分析了隧道開挖與樁基位移、軸力及樁周摩阻力變化之間的關(guān)系,主要進(jìn)行的工作有以下幾個(gè)方面:(1)分析了隧道開挖引起的土體位移變化和主要影響因素,采用Loganathan解析公式計(jì)算隧道開挖引起的土體位移;分析了土體豎向位移對(duì)既有橋樁的影響規(guī)律,然后通過剪切位移法建立起單樁及群樁位移控制方程,求解方程得出樁身位移及軸力變化的表達(dá)式;建立起隧道開挖前樁身的位移控制方程,得出開挖前的樁身位移、軸力分布表達(dá)式。(2)基于所推導(dǎo)的樁身位移及軸力公式,將其應(yīng)用到具體的工程實(shí)例中,計(jì)算了隧道開挖前的單樁及群樁位移軸力分布;將開挖引起的土體豎向位移分布進(jìn)行多項(xiàng)式擬合,計(jì)算出隧道開挖引起的單樁及群樁變形和受力變化;最后對(duì)單樁進(jìn)行了參數(shù)分析。(3)通過對(duì)施工現(xiàn)場(chǎng)進(jìn)行監(jiān)測(cè),獲取數(shù)據(jù)并分析得出地表和橋樁沉降規(guī)律;利用FLAC3D有限差分軟件建立模型,就實(shí)際采用環(huán)形開挖預(yù)留核心土法引起的土體橋樁沉降進(jìn)行數(shù)值計(jì)算,得出其分布規(guī)律;將所得的計(jì)算、實(shí)測(cè)及模擬結(jié)果進(jìn)行對(duì)比,通過實(shí)際監(jiān)測(cè)和模擬結(jié)果驗(yàn)證計(jì)算的正確性。(4)對(duì)現(xiàn)行規(guī)范中橋樁變形的控制標(biāo)準(zhǔn)進(jìn)行了總結(jié);根據(jù)計(jì)算的結(jié)果確定其加固的范圍;提出了實(shí)際工程中控制橋樁變形的措施,可以給工程施工進(jìn)行指導(dǎo)并具有一定的參考意義。
[Abstract]:In recent years, the urban development of our country is fast, the ground traffic congestion is serious, people pay more and more attention to the utilization of the underground space resources, each big and medium city carries on the underground rail transit construction in order to alleviate the ground traffic pressure. The construction of subway tunnel is restricted by the ground and underground environment, which will lead to the displacement of the soil around the foundation when passing through the existing building foundation, and then cause the additional internal force and deformation of the pile foundation. Causes the superstructure to appear the integral or uneven settlement, thus endangers the bridge and the building safe use. Therefore, it is of great significance for engineering construction to study the influence of shallow underground excavation on the existing pile foundation. In this paper, the previous research results are summarized, and the relationship between tunnel excavation and pile foundation displacement, axial force and friction around pile is analyzed. The main work is as follows: (1) analyzing the displacement of soil caused by tunnel excavation and the main influencing factors, using Loganathan analytic formula to calculate the displacement of soil caused by tunnel excavation; The influence of soil vertical displacement on existing bridge piles is analyzed, and then the displacement control equations of single pile and group pile are established by shear displacement method, and the expressions of pile displacement and axial force are obtained by solving the equations. The displacement control equation of pile body before excavation is established, and the displacement of pile body before excavation is obtained. The expression of axial force distribution is obtained. Based on the derived formula of displacement and axial force of pile body, it is applied to concrete engineering examples. The axial force distribution of single pile and group pile before tunnel excavation is calculated and the deformation and force change of single pile and group pile caused by tunnel excavation are calculated by polynomial fitting of vertical displacement distribution of soil caused by excavation. Finally, the parameters of the single pile are analyzed. 3) by monitoring the construction site, obtaining the data and analyzing the settlement law of the ground and bridge pile, the model is established by using the FLAC3D finite difference software. The settlement of soil bridge pile caused by ring excavation with reserved core soil method is numerically calculated, and its distribution law is obtained, and the calculated, measured and simulated results are compared. Through the actual monitoring and simulation results to verify the correctness of the calculation. 4) the control standard of bridge pile deformation in the current code is summarized, the reinforcement range is determined according to the calculation results, and the measures to control the bridge pile deformation in practical engineering are put forward. It can guide the project construction and has certain reference significance.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U231.3;U456.3

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃吉鋒;結(jié)構(gòu)近似分析中的二次位移假定[J];計(jì)算力學(xué)學(xué)報(bào);1999年01期

2 周志英,趙宏興,黃義春;單光束激光散斑照相法測(cè)微小位移[J];哈爾濱建筑工程學(xué)院學(xué)報(bào);1984年02期

3 李荷生;;估算滑坡位移的一種新方法[J];路基工程;1993年06期

4 張子達(dá);;土的應(yīng)力場(chǎng)和位移場(chǎng)流變理論分析計(jì)算方法[J];吉林工業(yè)大學(xué)學(xué)報(bào);1985年04期

5 劉惠珊,徐鳳萍,李鵬程,侯忠良;液化引起的地面大位移對(duì)工程的影響及研究現(xiàn)狀[J];特種結(jié)構(gòu);1997年02期

6 劉惠珊;徐鳳萍;李鵬程;;液化引起的地面大位移對(duì)工程的影響及研究現(xiàn)狀[J];工程抗震;1997年02期

7 孔憲賓;樁周土的位移場(chǎng)的研究[J];淮陰工學(xué)院學(xué)報(bào);2000年03期

8 王宜庚;物體表面細(xì)觀位移場(chǎng)測(cè)量方法的研究[J];南京理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2003年03期

9 廖少明,余炎,陳亮;由基坑擋墻位移推算地層位移場(chǎng)及其影響[J];巖土工程學(xué)報(bào);2005年07期

10 金長(zhǎng)義;復(fù)合材料圓板Ⅳ型界面裂紋擴(kuò)展應(yīng)力位移場(chǎng)[J];北京理工大學(xué)學(xué)報(bào);2005年08期

相關(guān)會(huì)議論文 前10條

1 王泳嘉;;位移不連續(xù)法與應(yīng)變核[A];第三屆巖石力學(xué)學(xué)術(shù)會(huì)議論文集（上）[C];1985年

2 郭保橋;陳鵬萬;謝惠民;;從帶測(cè)量噪聲的位移場(chǎng)計(jì)算應(yīng)變場(chǎng):兩種技術(shù)的研究與比較[A];第十三屆全國(guó)實(shí)驗(yàn)力學(xué)學(xué)術(shù)會(huì)議論文摘要集[C];2012年

3 李冬青;陶軍;田錫唐;李聃;;一種新的非接觸式焊接動(dòng)態(tài)位移場(chǎng)測(cè)量方法[A];第十次全國(guó)焊接會(huì)議論文集（第2冊(cè)）[C];2001年

4 胡文祥;錢夢(mèng)，

本文編號(hào)：1776262