本文關(guān)鍵詞：北京地鐵6號(hào)線物資學(xué)院站車站與隧道區(qū)間施工沉降控制技術(shù)研究　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地鐵 地表沉降 變截面 大斷面 PBA法

【摘要】：在地鐵施工中，區(qū)間行車隧道多采用盾構(gòu)法進(jìn)行施工，其相關(guān)的研究和施工經(jīng)驗(yàn)已得到大量的總結(jié)歸納，日趨完善，但是在隧道區(qū)間施工時(shí)常會(huì)遇到非常規(guī)斷面隧道的施工。大斷面變截面隧道具有較為復(fù)雜的特性，其開挖施工時(shí)造成的地表的沉降特點(diǎn)往往與普通隧道有較大的差別。在地鐵車站施工時(shí)，PBA工法在眾多工法中得到越來越多的應(yīng)用。本文以北京地鐵6號(hào)線二期工程物資學(xué)院站的施工建設(shè)和施工監(jiān)測(cè)數(shù)據(jù)為基礎(chǔ)，針對(duì)一站兩區(qū)間中的平交段大斷面變截面隧道和PBA工法車站的施工，運(yùn)用Midas/GTS軟件進(jìn)行數(shù)值模擬，模擬了不同施工順序?qū)Φ乇沓两档挠绊�，�?duì)比分析實(shí)際監(jiān)測(cè)數(shù)據(jù)和不同工況下的數(shù)值模擬結(jié)果，分析了不同施工方法對(duì)地表沉降的影響。 針對(duì)變截面大斷面隧道施工對(duì)地表沉降的影響，根據(jù)實(shí)際監(jiān)測(cè)數(shù)據(jù)和數(shù)值模擬結(jié)果，分析結(jié)果產(chǎn)生差異的原因，考慮實(shí)際施工情況，本文認(rèn)為在變截面隧道施工中，沿隧道施工方向的水平位移對(duì)地表沉降會(huì)產(chǎn)生不可忽視的影響，影響結(jié)果使得隧道兩端的沉降減少，而變截面位置的沉降較大。在變截面位置，截面埋深差較大的一側(cè)將產(chǎn)生沉降極值，該位置為地表沉降的最不利位置，在施工中應(yīng)重視該位置的沉降控制。運(yùn)用數(shù)值模擬對(duì)變截面隧道的施工順序進(jìn)行對(duì)比分析時(shí)，考慮變截面隧道中由大斷面向小斷面施工和從小斷面向大斷面施工兩種工況，得出以下結(jié)論：由大斷面向小斷面施工工程中，地表沉降集中在大斷面上方，沉降范圍較小，沉降最大值較大，從小斷面向大斷面施工過程中，沉降分布在整個(gè)隧道上方，沉降影響范圍較大，且由于隧道變換截面，范圍內(nèi)的沉降不均勻，在僅考慮地表沉降的情況下應(yīng)針對(duì)不同地表情況進(jìn)行施工順序的設(shè)計(jì)。 PBA工法是先開挖導(dǎo)洞來進(jìn)行由樁、墻、拱結(jié)構(gòu)組成的初期支護(hù)施工后再開挖整個(gè)斷面并進(jìn)行二襯施工的一種施工方法，本文中根據(jù)對(duì)采用PBA工法的車站的實(shí)際監(jiān)測(cè)數(shù)據(jù)分析，認(rèn)為采用PBA工法時(shí)，對(duì)地表沉降影響最大的施工步驟為上層中部導(dǎo)洞和扣拱位置的開挖施工，該步驟造成的沉降量占總沉降量的70%以上。在對(duì)PBA工法中不同小導(dǎo)洞施工順序進(jìn)行數(shù)值模擬，根據(jù)模擬結(jié)果，本文認(rèn)為先進(jìn)行下部導(dǎo)洞施工再進(jìn)行上部導(dǎo)洞施工能夠有效減少導(dǎo)洞開挖對(duì)地表沉降的影響，采用不同導(dǎo)洞施工順序完成導(dǎo)洞施工后，，施工扣拱步驟產(chǎn)生的沉降量基本一致，在扣拱施工完成后車站主體的沉降基本完成，后續(xù)施工步驟對(duì)車站施工帶來的地表沉降影響非常小，控制PBA車站施工對(duì)地表沉降影響主要應(yīng)在導(dǎo)洞施工順序和扣拱施工時(shí)的地表沉降控制等方面著手。
[Abstract]:In the subway construction, the shield method is used in the construction of the interval driving tunnel, and its related research and construction experience have been summarized and summarized, and become more and more perfect. However, the construction of unconventional cross-section tunnel is often encountered in the tunnel section construction. The large-section variable section tunnel has more complex characteristics. The settlement characteristics of the ground caused by the excavation are often different from those of the ordinary tunnel. PBA method has been used more and more in many engineering methods. This paper is based on the construction construction and construction monitoring data of Beijing Metro Line 6 Phase II Engineering Materials Institute Station. Aiming at the construction of large cross-section and variable cross section tunnel and PBA station in the two sections of one station and two stations, the influence of different construction sequence on the surface settlement is simulated by using Midas/GTS software. The actual monitoring data and numerical simulation results under different working conditions are compared and the effects of different construction methods on surface subsidence are analyzed. According to the influence of the construction of large section tunnel with variable cross section on the surface settlement, according to the actual monitoring data and numerical simulation results, the reasons for the difference between the results are analyzed, and the actual construction situation is considered. In this paper, it is concluded that the horizontal displacement along the tunnel construction direction can not be ignored in the construction of the tunnel with variable cross-section, which can not be ignored, and the result of the influence will reduce the settlement at both ends of the tunnel. In the position of variable section, the settlement extreme value will be produced in the side with large depth difference of section, which is the most unfavorable position of surface subsidence. During the construction, the settlement control of this position should be paid attention to, and the construction sequence of the tunnel with variable section should be compared and analyzed by numerical simulation. Considering the construction conditions of variable cross section tunnel from large section to small section and from small section to large section, the following conclusions are drawn: in the construction project from large section to small section, the ground subsidence is concentrated on the top of large section. The settlement range is smaller and the maximum settlement is larger. In the construction process from small section to large section, the settlement is distributed over the whole tunnel, and the settlement is not uniform because of the changing section of the tunnel. The design of construction sequence should be carried out according to different surface conditions only considering ground subsidence. PBA construction method is a kind of construction method which first excavates the guide hole to carry on the initial support construction which is composed of the pile, the wall, the arch structure, then excavates the entire section and carries on the two-lining construction. Based on the analysis of the actual monitoring data of the station with PBA method, the author thinks that the most important construction step for the ground subsidence is the excavation of the upper and middle diversion tunnel and the position of the buckle arch when using the PBA method. The settlement caused by this step is more than 70% of the total settlement. The different construction sequence of small guide tunnel in PBA construction method is numerically simulated, according to the simulation results. In this paper, it is concluded that the lower guide tunnel construction and the upper guide tunnel construction can effectively reduce the influence of the tunnel excavation on the surface settlement, and the different construction sequence of the guide tunnel construction can be used to complete the guide tunnel construction. The settlement of the main body of the station is basically completed after the construction of the arch buckle, and the effect of the subsequent construction steps on the ground surface settlement is very small. In order to control the influence of PBA station construction on surface settlement, the construction sequence of guide tunnel and the control of surface settlement during arch construction should be taken into account.
【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】：2014
【分類號(hào)】：U231.3;U455.4

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