本文選題：地下車(chē)站　切入點(diǎn)：下穿橋梁　出處：《北京建筑大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著城市交通的發(fā)展,地鐵的建設(shè)也成為了一個(gè)城市進(jìn)步發(fā)展的標(biāo)志,但建設(shè)地鐵對(duì)周?chē)h(huán)境影響較大,尤其是像北京這樣立交橋隨處可見(jiàn)的城市,這樣就出現(xiàn)了地鐵下穿橋梁的現(xiàn)象,區(qū)間下穿橋梁的例子已經(jīng)屢見(jiàn)不鮮,但車(chē)站下穿橋梁的工程還屈指可數(shù),尤其是淺埋暗挖車(chē)站下穿橋梁,一旦出現(xiàn),就會(huì)存在特級(jí)風(fēng)險(xiǎn),因此,研究暗挖車(chē)站下穿橋梁已經(jīng)十分必要。本文以北京地鐵六號(hào)線一期花園橋站下穿花園橋工程為背景,采用理論研究、數(shù)值計(jì)算和現(xiàn)場(chǎng)實(shí)踐的方式進(jìn)行了研究,主要內(nèi)容如下： (1)從工程造價(jià)、結(jié)構(gòu)安全性、工序轉(zhuǎn)換、降水深度等方面總結(jié)對(duì)比了洞樁法的七種施工方案； (2)基于樁側(cè)暗挖卸荷理論,并以鄧肯張模型在卸荷中考慮土體模量的變化為依據(jù),在Mohr-Coulomb模型中引入鄧肯張模型的切線模量和切線泊松比計(jì)算公式,以此來(lái)考慮開(kāi)挖卸荷對(duì)土層參數(shù)的影響,并對(duì)此基于FLAC3D進(jìn)行了二次開(kāi)發(fā),并用于實(shí)際工程計(jì)算,與實(shí)際監(jiān)測(cè)值進(jìn)行了對(duì)比； (3)利用考慮卸荷影響的M-C模型為土體計(jì)算模型,結(jié)合花園橋站下穿花園橋工程進(jìn)行數(shù)值模擬計(jì)算,得出非對(duì)稱洞樁法非對(duì)稱下穿橋梁時(shí)地表、橋樁、橋墩的變形規(guī)律,并分析了上部橋梁結(jié)構(gòu)的內(nèi)力變化規(guī)律； (4)結(jié)合五導(dǎo)洞非對(duì)稱下穿橋梁的五種工序進(jìn)行對(duì)比分析,提出了合理的施工步序；結(jié)合6導(dǎo)洞、5導(dǎo)洞、4導(dǎo)洞、3導(dǎo)洞方案進(jìn)行分析,得出各種方案下地表及橋墩的變形規(guī)律,然后結(jié)合橫導(dǎo)洞的施工和橋樁加長(zhǎng)等四種情況進(jìn)行分析,得出了最優(yōu)導(dǎo)洞的數(shù)量,說(shuō)明了橫導(dǎo)洞開(kāi)挖提前施做底板對(duì)橋梁的影響規(guī)律以及補(bǔ)樁后橋墩的變形規(guī)律 (5)提出了注漿加固、圍護(hù)樁加固、復(fù)合錨桿樁隔離、橋樁補(bǔ)強(qiáng)托換、掌子面超前加固等八種加固措施,并對(duì)每種措施的加固效果進(jìn)行了建模分析,綜合得出最優(yōu)措施,并對(duì)圍護(hù)樁加固和復(fù)合錨桿樁加固時(shí)的樁長(zhǎng)進(jìn)行優(yōu)化。
[Abstract]:With the development of urban traffic, subway construction has become a symbol of urban progress and development, but subway construction has a great impact on the surrounding environment, especially in cities such as Beijing, where overpasses are everywhere. In this way, there is a phenomenon of undercutting bridges under the subway. Examples of bridge crossing under the interval are common, but there are only a handful of projects to bridge under the station, especially the shallow excavation of the bridge under the station. Once it appears, there will be a special risk. Therefore, it is very necessary to study the undercut bridge under the station. Based on the garden bridge project of the first phase of Beijing Metro Line 6, the research is carried out by means of theoretical research, numerical calculation and field practice. The main contents are as follows:. 1) from the aspects of project cost, structural safety, process conversion, dewatering depth and so on, this paper summarizes and compares seven construction schemes of hole pile method; 2) based on the theory of pile side excavating and unloading, and on the basis of Duncan's model considering the variation of soil modulus in unloading, the tangent modulus and tangent Poisson's ratio of Duncan's model are introduced into Mohr-Coulomb model. The influence of excavation unloading on soil parameters is considered, and the secondary development based on FLAC3D is carried out, which is used in practical engineering calculation and compared with the actual monitoring value. Using M-C model considering the influence of unloading as soil calculation model, combined with the numerical simulation calculation of garden bridge project under garden bridge station, the deformation law of ground surface, bridge pile and pier is obtained when asymmetric hole pile method is used to unsymmetrical underpass bridge. The law of internal force variation of upper bridge structure is also analyzed. In combination with the comparison and analysis of the five processes of asymmetric underpass bridge with five tunnels, the reasonable construction sequence is put forward, and the deformation law of surface and piers under various schemes is obtained by combining with the scheme of No. 6 tunnel, No. 5 tunnel, No. 4 tunnel, No. 4 tunnel, and No. 3 tunnel. Based on the analysis of the construction of the transverse guide tunnel and the lengthening of the bridge pile, the optimal number of the guide holes is obtained, and the influence law of the foundation slab on the bridge and the deformation law of the pier after the pile filling are explained. Eight reinforcement measures, such as grouting reinforcement, enclosing pile reinforcement, composite anchor pile isolation, bridge pile reinforcement and replacement, and forehand face reinforcement, are put forward, and the reinforcement effects of each kind of measures are modeled and analyzed, and the optimal measures are obtained synthetically. The length of the pile is optimized when the retaining pile is strengthened and the composite anchor pile is strengthened.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U231.4;U445.72

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