發(fā)布時(shí)間：2018-02-27 12:01

  本文關(guān)鍵詞： 新人工填筑土層 超大斷面隧道 地表沉降 拱頂沉降 地層固結(jié)沉降 控制措施　出處：《中國鐵道科學(xué)》2017年06期 　論文類型：期刊論文

【摘要】：以貴陽立體交通樞紐工程龍洞堡機(jī)場隧道工程為背景,綜合運(yùn)用現(xiàn)場測試、模型試驗(yàn)及數(shù)值計(jì)算方法,對超厚新人工填筑土地層超大斷面隧道施工導(dǎo)致的地表沉降及其控制對策進(jìn)行研究�；趯�(shí)測的隧道拱頂沉降,根據(jù)既有的計(jì)算方法計(jì)算拱頂全部沉降;通過室內(nèi)模型試驗(yàn)和三維數(shù)值模擬得到因地層損失引起的地表沉降占拱頂全部沉降的比率;根據(jù)拱頂全部沉降和比率計(jì)算得到隧道施工導(dǎo)致的地表沉降;再根據(jù)實(shí)測的地表總沉降,確定隧道施工和土體自身固結(jié)分別導(dǎo)致的地表沉降占地表總沉降的比例。結(jié)果表明:隧道施工導(dǎo)致的地表沉降是拱頂沉降的35%~36%,占地表總沉降的20%~34%,土體固結(jié)導(dǎo)致的地表沉降占地表總沉降的66%~80%,可見土體固結(jié)是導(dǎo)致地表沉降的主要因素。由此提出控制地表沉降的主要對策:通過地表鋼管樁注漿加固,對土層進(jìn)行改良;對拱部進(jìn)行中管棚超前支護(hù);采用大拱腳弧形導(dǎo)坑預(yù)留核心土臺階法開挖隧道;設(shè)置H175型鋼鋼架加強(qiáng)初期支護(hù),二次襯砌盡可能地緊跟初期支護(hù)施作。
[Abstract]:Based on the project of Longdongbao Airport Tunnel of Guiyang Three-dimensional Traffic Hub Project, the field test, model test and numerical calculation method are used synthetically. In this paper, the surface settlement caused by the construction of super-thick artificial oversized tunnel and its control measures are studied. Based on the measured settlement of the tunnel arch, the total settlement of the arch is calculated according to the existing calculation method. Through indoor model test and three-dimensional numerical simulation, the ratio of ground subsidence caused by ground loss to total settlement of arch roof is obtained, and the surface settlement caused by tunnel construction is calculated according to the total settlement and ratio of arch roof. And then according to the measured total surface subsidence, The results show that the surface settlement caused by tunnel construction and soil self consolidation is 35 / 36 of dome settlement, 20 / 34 of total surface settlement and 20 / 34 of total surface settlement, and the consolidation of soil is caused by consolidation of soil mass. The surface settlement covers an area of 66% 80% of the total settlement. It can be seen that the consolidation of soil is the main factor leading to the surface settlement. Therefore, the main countermeasures to control the surface settlement are put forward: the reinforcement of the surface steel pipe pile by grouting, The soil layer is improved; the arch is supported in advance by the pipe shed; the tunnel is excavated by the method of retaining the core earth step in the arch arch arc; the H175 steel frame is set up to strengthen the initial support; the secondary lining is as close as possible to the initial support.
【作者單位】： 西南交通大學(xué)交通隧道工程教育部重點(diǎn)實(shí)驗(yàn)室;西南交通大學(xué)陸地交通地質(zhì)災(zāi)害防治技術(shù)國家工程實(shí)驗(yàn)室;西南交通大學(xué)土木工程學(xué)院;中國中鐵二院工程集團(tuán)有限責(zé)任公司;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51378435) 貴州省科技計(jì)劃項(xiàng)目(黔科合GZ字[2013]3016)
【分類號】：P642.26;U455.4

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