本文選題：地層沉降　切入點：下穿　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：城鎮(zhèn)化促進(jìn)了城市軌道交通建設(shè)快速發(fā)展，各種復(fù)雜的工程建設(shè)條件也不斷出現(xiàn)。地鐵隧道與既有鐵路或站場交疊便是其中之一，在這種情況下，要求地鐵施工與國鐵運(yùn)營互不影響，工程建設(shè)難度極大。本文針對西安地鐵四號線火車站站下穿國鐵西安站站場過程中引起的地表沉降這一問題，從隧道下穿施工對列車安全運(yùn)行、鐵路線路不平順性、鐵路路基及軌道三大方面的影響，分析了淺埋暗挖法隧道下穿對鐵路線路的影響，，提出了軌道結(jié)構(gòu)變形控制是隧道下穿既有鐵路線路沉降控制的根本所在，且隧道下穿施工對軌道結(jié)構(gòu)沉降變形影響較大，而對軌道水平偏差及軌向偏差的影響甚微。將既有鐵路線路高低偏差控制規(guī)定與鐵路線路沉降規(guī)律相結(jié)合，提出了滿足《鐵路線路修理規(guī)則》規(guī)定的，適合于本工程的最大沉降控制標(biāo)準(zhǔn)值及最大沉降速率控制標(biāo)準(zhǔn)值。 根據(jù)西安地鐵相關(guān)經(jīng)驗，確定了下穿國鐵站場區(qū)的淺埋暗挖隧道的施工方案及支護(hù)措施，包括“CRD”法及雙側(cè)壁導(dǎo)坑法兩種工法開挖的兩類斷面的施工方案及支護(hù)措施。通過MIDAS/GTS有限元軟件進(jìn)行數(shù)值模擬，對隧道輪廓線外注漿加固圈的合理厚度進(jìn)行了研究，在滿足最大允許地表沉降值及最大地表沉降速率的地表沉降控制標(biāo)準(zhǔn)的前提下，確定“CRD”法及雙側(cè)壁導(dǎo)坑法開挖的兩類斷面達(dá)到效果最優(yōu)、資源最省的加固圈厚度均為2.0m。同時，提出了包括詳細(xì)的施工措施、下穿前的預(yù)防措施以及需要鐵路部門配合的工作等一系列隧道下穿國鐵站場施工時，可采取的保護(hù)措施。 針對西安四號線地鐵工程的特點，制定了淺埋暗挖隧道下穿國鐵站場施工過程中的隧道洞內(nèi)變形及地表沉降監(jiān)控量測方案，同時還提出了對站場區(qū)鐵路線路變形監(jiān)測方案。 論文的研究成果將在西安地鐵四號線建設(shè)中得到應(yīng)用、檢驗和完善。
[Abstract]:Urbanization has promoted the rapid development of urban rail transit construction, and various complex engineering construction conditions are constantly emerging. The overlap of subway tunnels and existing railways or stations is one of them, in this case, The subway construction and the national railway operation are required to have no influence on each other, and the construction of the project is very difficult. This paper aims at the problem of surface settlement caused by the passing through the station yard of Xi'an Railway Station under Xi'an Metro Line 4. From the influence of tunnel underpass construction on train safety, irregularity of railway line, railway subgrade and track, this paper analyzes the influence of shallow tunneling method on railway line. It is put forward that the control of track structure deformation is the foundation of the settlement control of the existing railway line under the tunnel, and the tunnel underpass construction has a great influence on the settlement and deformation of the track structure. However, it has little effect on the horizontal deviation and the rail deviation. Combining the control rules of the high and low deviation of the existing railway lines with the settlement law of the railway lines, the paper puts forward the measures to meet the requirements of the "Railway Line repair rules". The maximum settlement control standard value and the maximum settlement rate control standard value are suitable for this project. According to the relevant experience of Xi'an subway, the construction scheme and supporting measures of the shallow buried underground excavation tunnel under the national railway station area are determined. Including the construction scheme and supporting measures of two kinds of sections excavated by "CRD" method and double-sidewall guide pit method. The reasonable thickness of grouting reinforcement ring outside the tunnel contour is studied by numerical simulation of MIDAS/GTS finite element software. On the premise of satisfying the maximum allowable surface settlement value and the maximum surface settlement rate, it is determined that the two types of sections excavated by "CRD" method and double-side wall guide pit method have the optimum effect, and the thickness of the reinforcement circle with the most economical resources is 2.0 m. at the same time, This paper puts forward a series of protective measures, including detailed construction measures, preventive measures before underpass and the work that the railway department should cooperate with, when the construction of the national railway station under the tunnel is carried out. According to the characteristics of Xi'an Line 4 subway engineering, the monitoring and measuring scheme of tunnel deformation and surface settlement during the construction process of shallow tunneling tunneling through the National Railway Station is established. At the same time, the monitoring scheme of railway line deformation in the station field area is also put forward. The research results of this paper will be applied, tested and perfected in the construction of Xi'an Metro Line 4.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.4

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