本文選題：地鐵車站 + 洞樁法　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：近年來(lái)地鐵建設(shè)發(fā)展迅猛,地鐵車站施工工藝很多,其中地鐵車站洞樁法施工以自身獨(dú)特的優(yōu)勢(shì)受到各方的關(guān)注。洞樁法是在暗挖的小導(dǎo)洞內(nèi)施作蓋挖法的樁梁框架體系作為初期支護(hù),其具體原理為先在地下將大斷面洞室拆分為若干個(gè)小導(dǎo)洞開(kāi)挖,再?gòu)男?dǎo)洞內(nèi)施作“樁”“柱”“拱”“梁”框架形成牢固的初期支護(hù)體系,在該支護(hù)體系的初期保護(hù)下,便可在樁梁柱的初期支護(hù)體系內(nèi)側(cè)施作防水和永久性二襯,同時(shí)依次向下開(kāi)挖施作內(nèi)部洞室結(jié)構(gòu)。洞樁法主要特點(diǎn)是地層適應(yīng)性強(qiáng),在各種地層條件下施工都能很好的控制地表沉降變形,相比傳統(tǒng)的淺埋暗挖法更為安全可靠,洞樁法既能降低大斷面暗挖施工帶來(lái)的沉降風(fēng)險(xiǎn),同時(shí)也能避免蓋挖法需要提前進(jìn)行明挖施工的繁雜工序。但是洞樁法的工序轉(zhuǎn)換較多,受力轉(zhuǎn)化復(fù)雜,在不同地層表現(xiàn)出的沉降影響差異性也很大。針對(duì)復(fù)雜粘土地層中進(jìn)行洞樁法施工對(duì)地表沉降的影響,本文進(jìn)行了數(shù)值模擬分析,以北京某地鐵車站洞樁法施工項(xiàng)目為參考,根據(jù)模擬結(jié)果指導(dǎo)該車站施工地表沉降監(jiān)測(cè)點(diǎn)的布置。通過(guò)收集了標(biāo)準(zhǔn)斷面加密監(jiān)測(cè)點(diǎn)的實(shí)測(cè)沉降數(shù)據(jù),對(duì)實(shí)測(cè)數(shù)據(jù)和之前做的模擬計(jì)算值進(jìn)行了對(duì)比分析,研究證明數(shù)值模擬計(jì)算得出的沉降數(shù)據(jù)與實(shí)測(cè)數(shù)據(jù)相符,驗(yàn)證了數(shù)值模擬法的合理性,同時(shí)表明數(shù)值建模方法能有效的指導(dǎo)洞樁法施工的地表沉降監(jiān)測(cè)點(diǎn)布置。該地層條件下導(dǎo)洞開(kāi)挖階段、樁拱施作階段、二襯施作階段產(chǎn)生的地表沉降量分別為16.37mm、2.91mm、18.88mm,分別占比為42.9%、7.6%、49.5%,并結(jié)合實(shí)際施工情況探討控制地表沉降的關(guān)鍵措施。
[Abstract]:In recent years, subway construction has developed rapidly, and there are many construction techniques in subway station. Among them, tunnel pile construction of subway station has attracted attention from all sides for its own unique advantages. The pile-pile method is to use the pile-beam frame system as the initial support in the small guide tunnel. The concrete principle is that the large section cavern is divided into several small guide holes in the underground first, and the concrete principle is that the large section cavern is divided into several small guide holes in the underground excavation. Then the frame of "pile", "column", "arch" and "beam" is applied from the small guide hole to form a solid initial support system. Under the initial protection of the supporting system, the waterproof and permanent secondary lining can be applied to the inner side of the initial support system of the pile Liang Zhu. At the same time, the structure of the inner cavern is excavated downward in turn. The main characteristic of the tunnel pile method is that it has strong adaptability to the strata, and it can control the ground subsidence and deformation well under various stratum conditions, which is more safe and reliable than the traditional shallow excavation method. The tunnel pile method can not only reduce the settlement risk brought by the large section excavation construction, but also avoid the complicated working procedure of the cover excavation method which needs to carry out the open excavation construction in advance. However, the hole pile method has a lot of process conversion and complex force transformation, and the difference of settlement effect in different strata is also great. In view of the influence of tunnel pile construction on surface settlement in complex clay strata, this paper carries out numerical simulation and analysis, taking the construction project of hole pile method for a subway station in Beijing as a reference. According to the simulation results, the layout of the ground subsidence monitoring points in the construction of the station is guided. Through collecting the measured settlement data of the standard section encryption monitoring point, comparing and analyzing the measured data and the previous simulated calculation value, it is proved that the settlement data obtained by the numerical simulation is in accordance with the measured data. The rationality of the numerical simulation method is verified, and it is shown that the numerical modeling method can effectively guide the ground subsidence monitoring points arrangement in the construction of the hole pile method. Under this condition, the ground subsidence in the excavation stage, the pile arch stage and the second lining stage are 16.37mm / 2.91mm / 18.88mm respectively, with the ratio of 42.9mm / 7.6m / 49.5mm, respectively, and the key measures to control the surface subsidence are discussed in the light of the actual construction conditions.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U231.3;P642.26
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本文編號(hào)：1824648