本文關(guān)鍵詞：下穿新鄉(xiāng)火車站站房隧道施工關(guān)鍵技術(shù)研究　出處：《石家莊鐵道大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 下穿隧道 超前支護(hù) 施工方法 管幕 站房 箱涵頂進(jìn)法

【摘要】：近年來(lái),各城市加快建設(shè)和完善地面交通系統(tǒng),趨于完善的地面交通系統(tǒng)在一定程度上緩解了交通擁堵,但仍滿足不了市民的需求,人們開(kāi)始把目光轉(zhuǎn)向發(fā)展地下交通系統(tǒng),各種地下交通設(shè)施應(yīng)運(yùn)而生。這些地下隧道的施工,將會(huì)不可避免的下穿既有建筑物或者既有管線、線路。然而,無(wú)論是那種形式的下穿隧道,它的開(kāi)挖必然會(huì)擾動(dòng)地層,引發(fā)地表沉降,該沉降會(huì)使鄰近建筑產(chǎn)生傾斜、扭曲等不良現(xiàn)象。如果不采取適當(dāng)施工方法和保護(hù)加固措施就可能會(huì)發(fā)生過(guò)量變形,輕則裂開(kāi),重則倒塌,給國(guó)家造成巨大的經(jīng)濟(jì)損失和不良社會(huì)影響。故分析下穿隧道的施工對(duì)地面建筑物的影響并對(duì)其安全性進(jìn)行預(yù)測(cè)評(píng)估成了迫切需要研究的課題。本文以新鄉(xiāng)市平原路疏堵保障工程下穿新鄉(xiāng)火車站站房隧道為背景,通過(guò)數(shù)值模擬計(jì)算,找出下穿隧道合理施工方案,并分析隧道施工對(duì)火車站站房的影響。論文主要包括以下幾個(gè)部分:(1)綜合分析多種超前支護(hù)措施和施工方法各自的優(yōu)缺點(diǎn)及適用條件,結(jié)合本工程地質(zhì)條件及環(huán)境因素,得出本工程下穿隧道應(yīng)采用管幕注漿超前支護(hù)措施,施工方法應(yīng)采用交叉中隔壁法(CRD法)或箱涵頂進(jìn)法。(2)本文通過(guò)FLAC3D有限差分軟件模擬隧道施工過(guò)程,對(duì)CRD法超前支護(hù)方案進(jìn)行優(yōu)化,考慮四種超前支護(hù)方案,分別是φ108大管棚加φ42小導(dǎo)管方案、φ600管幕水平加固方案、φ600管幕周邊加固方案、φ300管幕周邊加固方案。通過(guò)數(shù)值模擬計(jì)算分析,得出CRD法最優(yōu)超前支護(hù)方案為φ300管幕周邊加固方案。在此基礎(chǔ)上,研究此方案下隧道施工對(duì)上方站房的影響規(guī)律。(3)將管幕周邊方案與箱涵頂進(jìn)法相結(jié)合,通過(guò)數(shù)值模擬計(jì)算,研究其施工引起的箱涵周邊位移及對(duì)上方站房的影響規(guī)律,并與管幕超前支護(hù)措施下CRD法施工方案作對(duì)比分析。
[Abstract]:In recent years, cities speed up the construction and improvement of the ground transportation system, tend to improve the ground traffic system to a certain extent to alleviate traffic congestion, but still can not meet the needs of the public. People begin to turn their eyes to the development of underground transportation systems, and various underground transportation facilities come into being. The construction of these underground tunnels will inevitably go down through existing buildings or existing pipelines and lines. No matter what kind of underpass tunnel, its excavation will inevitably disturb the formation, causing ground subsidence, which will cause the adjacent building to tilt. If we do not take appropriate construction methods and protection and reinforcement measures, there may be excessive deformation, light cracking, heavy collapse. It is an urgent task to analyze the influence of tunnel construction on ground buildings and to predict and evaluate its safety. Under the original road sparse block protection project under the Xinxiang railway station station room tunnel as the background. Through numerical simulation calculation, find out the reasonable construction plan of the underpass tunnel. The paper mainly includes the following parts: 1) Comprehensive analysis of the advantages and disadvantages and applicable conditions of various advanced supporting measures and construction methods. Combined with the geological conditions and environmental factors of the project, it is concluded that the pipe curtain grouting advance support measures should be adopted in the tunnel under the project. The method of construction should adopt the method of crossing middle and next door) or the method of jacking of box culvert. This paper simulates the construction process of tunnel with FLAC3D finite difference software and optimizes the advance support scheme of CRD method. Four advanced support schemes are considered, which are 蠁 108 pipe shed plus 蠁 42 small ducts, 蠁 600 pipe curtain horizontal reinforcement and 蠁 600 pipe curtain peripheral reinforcement. Through numerical simulation and analysis, the optimal advance support scheme of CRD method is 蠁 300 pipe curtain peripheral reinforcement scheme. The influence law of tunnel construction on the upper station room under this scheme is studied. (3) combining the pipe curtain peripheral scheme with the box culvert jacking method, the numerical simulation calculation is carried out. The surrounding displacement of box culvert caused by its construction and its influence on the upper station room are studied and compared with the construction scheme of CRD method under the advance support measures of pipe curtain.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4

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本文編號(hào)：1417014