本文選題：大面積　切入點(diǎn)：深基坑　出處：《鐵道工程學(xué)報(bào)》2017年04期

【摘要】：研究目的:本文以某大面積深基坑為工程背景,該基坑鄰近既有高速鐵路橋梁及路基段,為確保施工期間鐵路運(yùn)營(yíng)的安全性、降低施工風(fēng)險(xiǎn),文中依據(jù)現(xiàn)行規(guī)范建立合理的高速鐵路安全評(píng)估標(biāo)準(zhǔn),經(jīng)有限元模擬,分別對(duì)高速鐵路路基及橋梁的沉降、相鄰橋墩差異沉降、橫向水平變形、縱向水平變形、軌道平順性以及橋梁基礎(chǔ)結(jié)構(gòu)安全性等進(jìn)行計(jì)算分析并給出合理的評(píng)價(jià),從而確�；庸こ淌┕み^程中高速鐵路運(yùn)營(yíng)的安全性。研究結(jié)論:(1)高速鐵路路基、橋梁疊加初始設(shè)計(jì)值后,各施工階段的累積沉降值滿足規(guī)范中15 mm、20 mm的限值要求;(2)高速鐵路橋梁疊加初始設(shè)計(jì)值后的累積差異沉降滿足規(guī)范中4 mm的限值要求;(3)疊加初始設(shè)計(jì)值后,各施工階段橫向水平變形均小于規(guī)范限值15.75 mm,縱向水平變形均小于規(guī)范限值28.06 mm;(4)在整個(gè)施工過程中,正線橋梁?jiǎn)螛冻休d力值均滿足單樁容許承載力要求;(5)該研究成果可為鄰近高速鐵路的深基坑開挖等類似工程領(lǐng)域提供借鑒。
[Abstract]:Research purpose: this paper takes a large area deep foundation pit as the engineering background, the foundation pit is adjacent to the existing high-speed railway bridge and subgrade section, in order to ensure the safety of railway operation during construction, reduce the construction risk, In this paper, a reasonable safety evaluation standard for high speed railway is established according to the current code. By finite element simulation, the settlement of subgrade and bridge, differential settlement of adjacent piers, lateral horizontal deformation and longitudinal horizontal deformation are calculated, respectively. In order to ensure the safety of high-speed railway operation during foundation pit construction, the track ride comfort and the safety of bridge foundation structure are calculated and analyzed, and the research conclusion is: 1) the subgrade of high-speed railway. After the bridge is superimposed with the initial design value, The cumulative settlement value of each construction stage meets the limit requirement of 15mm / 20mm in the code) the cumulative differential settlement after the superposition of the initial design value of the high-speed railway bridge meets the requirement of the limit value of the code (4mm)) after the initial design value is superimposed, the cumulative differential settlement meets the requirement of the 4mm limit in the code. The transverse horizontal deformation of each construction stage is less than the standard limit value of 15.75 mm, and the longitudinal horizontal deformation is less than the standard limit value of 28.06 mm / / 4) during the whole construction process, The value of single pile bearing capacity of main line bridge meets the requirement of single pile allowable bearing capacity. The research results can be used for reference in similar engineering fields such as deep foundation pit excavation of adjacent high-speed railway.
【作者單位】： 鐵道第三勘察設(shè)計(jì)院集團(tuán)有限公司;
【分類號(hào)】：TU753;U238

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本文編號(hào)：1697781