【摘要】：地鐵軌道沿線人口密集、高層建筑與大型地下商場(chǎng)快速建設(shè),深基坑工程也隨之增加。深基坑開挖伴隨著土壓力卸載,周圍土體應(yīng)力重分布,對(duì)臨近地鐵隧道等建筑不可避免地產(chǎn)生影響。基坑支護(hù)結(jié)構(gòu)是保持基坑穩(wěn)定的重要支撐,當(dāng)深基坑變形量小、穩(wěn)定性良好時(shí),鄰近深基坑的地鐵隧道變形通常在可控范圍內(nèi)微小變化,因此,研究支護(hù)結(jié)構(gòu)對(duì)鄰近地鐵隧道變形的影響,能夠?yàn)猷徑罔F隧道的深基坑支護(hù)設(shè)計(jì)提供有力依據(jù),以保證深基坑工程建設(shè)順利進(jìn)行、地鐵隧道安全不受影響。本文以鄭州綜合交通樞紐地下交通工程為研究背景,結(jié)合土力學(xué)理論分析、有限元軟件ABAQUS建模分析與施工現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),研究了雙側(cè)深基坑開挖過(guò)程中,樁錨支護(hù)和地連墻對(duì)鄰近地鐵隧道的變形影響。主要內(nèi)容包括:(1)樁錨支護(hù)與地連墻的適用性、結(jié)構(gòu)特點(diǎn)、施工工藝及破壞形式。(2)總結(jié)了深基坑開挖過(guò)程中樁錨支護(hù)與地連墻的受力與變形機(jī)理,分析了深基坑開挖過(guò)程中樁錨支護(hù)與地連墻的力學(xué)計(jì)算理論,在此基礎(chǔ)上,總結(jié)了樁錨支護(hù)與地連墻對(duì)鄰近地鐵隧道變形影響的分析理論。(3)以鄰近地鐵隧道的雙側(cè)深基坑(鄭州綜合交通樞紐地下交通工程)為工程背景,對(duì)其工程概況、地質(zhì)條件、水文條件進(jìn)行了詳細(xì)梳理,在此基礎(chǔ)上得出了基坑土體的物理力學(xué)性質(zhì),并對(duì)東廣場(chǎng)工程的施工方案進(jìn)行了總結(jié)。(4)利用有限元軟件ABAQUS計(jì)算了鄭州綜合交通樞紐地下交通工程(東廣場(chǎng))深基坑開挖過(guò)程中地鐵隧道的變形,并與施工現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)進(jìn)行對(duì)比,分析了雙側(cè)深基坑開挖過(guò)程中相鄰地鐵隧道的變形規(guī)律。(5)利用有限元軟件ABAQUS模擬了不進(jìn)行支護(hù)時(shí)地鐵隧道的變形,單獨(dú)使用樁錨支護(hù)時(shí)地鐵隧道的變形,以及在樁錨和地連墻共同支護(hù)下地鐵隧道的變形,將三種支護(hù)方案下地鐵隧道的變形狀況進(jìn)行對(duì)比,研究了樁錨支護(hù)和地連墻對(duì)雙側(cè)深基坑地鐵隧道的變形影響。研究結(jié)果表明:隨著雙側(cè)深基坑開挖,相鄰地鐵隧道發(fā)生沉降變形,加設(shè)樁錨支護(hù)與地連墻之后地鐵隧道的沉降變形略有減小,減小幅度不大;地鐵隧道水平位移向相鄰基坑邊緣增大,樁錨支護(hù)與地連墻均有減小地鐵隧道水平位移的作用,與沉降變形相比,樁錨支護(hù)對(duì)相鄰地鐵隧道的水平位移減小作用明顯,地連墻亦是如此;地鐵隧道截面尺寸變化為水平直徑增大,豎向直徑減小,樁錨支護(hù)和地連墻對(duì)地鐵隧道的應(yīng)力集中現(xiàn)象具有一定的減小作用。本研究為鄰近地鐵隧道的深基坑支護(hù)結(jié)構(gòu)設(shè)計(jì)提供了理論依據(jù)。
[Abstract]:With the rapid construction of high-rise buildings and large underground shopping malls, the deep foundation pit works are increasing. The excavation of deep foundation pit is accompanied by the unloading of earth pressure, and the stress distribution of surrounding soil is redistributed, which inevitably affects the adjacent subway tunnel and other buildings. The supporting structure of foundation pit is an important support to maintain the stability of foundation pit. When the deformation of deep foundation pit is small and the stability is good, the deformation of subway tunnel adjacent to deep foundation pit usually changes slightly within the controllable range, so, The study of the influence of the supporting structure on the deformation of the adjacent subway tunnel can provide a powerful basis for the design of the deep foundation pit support of the adjacent subway tunnel, so as to ensure the smooth construction of the deep foundation pit project and the safety of the subway tunnel will not be affected. In this paper, based on the underground traffic engineering of Zhengzhou comprehensive transportation hub, combined with soil mechanics theory analysis, finite element software ABAQUS modeling analysis and construction site monitoring data, the excavation process of bilateral deep foundation pit is studied. The influence of pile-anchor support and ground-connecting wall on the deformation of adjacent subway tunnel. The main contents are as follows: (1) applicability, structural characteristics, construction technology and failure form of pile-anchor support and ground connecting wall. (2) stress and deformation mechanism of pile anchor support and ground connecting wall during excavation of deep foundation pit are summarized. This paper analyzes the mechanics calculation theory of pile anchor support and ground connecting wall in the course of deep foundation pit excavation, on the basis of which, This paper summarizes the analysis theory of the influence of pile and anchor support and ground connecting wall on the deformation of adjacent subway tunnel. (3) taking the deep foundation pit of adjacent subway tunnel (underground traffic engineering of Zhengzhou comprehensive traffic hub) as the engineering background, the general situation of the project and the geological conditions are discussed. On the basis of the detailed analysis of hydrological conditions, the physical and mechanical properties of foundation pit soil are obtained. The construction scheme of the East Square Project is summarized. (4) the deformation of the subway tunnel during the excavation of the deep foundation pit of the Zhengzhou Comprehensive Transportation Hub Underground Transportation Project (East Square) is calculated by using the finite element software ABAQUS. Compared with the monitoring data of construction site, the deformation law of adjacent subway tunnel during the excavation of bilateral deep foundation pit is analyzed. (5) the deformation of subway tunnel without supporting is simulated by using finite element software ABAQUS. The deformation of subway tunnel under the support of pile and anchor alone, and the deformation of subway tunnel under the joint support of pile anchor and ground connecting wall are compared. The influence of pile-anchor support and ground-connecting wall on the deformation of subway tunnel with deep foundation pit is studied. The results show that: with the excavation of deep foundation pit on both sides, the settlement deformation of adjacent subway tunnel occurs, and the settlement deformation of subway tunnel decreases slightly with the addition of pile-anchor support and ground connecting wall. The horizontal displacement of subway tunnel increases to the edge of adjacent foundation pit. Both pile and anchor support and ground connecting wall can reduce the horizontal displacement of subway tunnel. Compared with settlement deformation, pile anchor support can reduce the horizontal displacement of adjacent subway tunnel obviously. The horizontal diameter increases and the vertical diameter decreases. The pile-anchor support and the ground connecting wall play a certain role in reducing the stress concentration phenomenon of the subway tunnel. This study provides a theoretical basis for the design of deep foundation pit support structure adjacent to subway tunnel.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U231;U456.3

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