【作者】 时亚昕；

【导师】 王明年；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2004， 硕士

【摘要】 本文以长大铁路隧道为对象，研究了复杂地质条件下长大隧道施工过程中，为了控制隧道围岩的过大变形及加快隧道施工进度，其仰拱及其铺底采用干硬性混凝土和钢筋混凝土预制板组合结构的现场试验过程及施工方法。 目前，解决长大隧道快速施工的主要方法是增设平导、斜井等，而隧道仰拱采用干硬性混凝土和钢筋混凝土预制板组合结构的技术，既能增加隧道施工的安全性，又能实现节省投资快速施工。采用该技术进行仰拱施工方案主要是在隧道仰拱和铺底施工时，先铺筑坍落度较小的混凝土，然后将混凝土预制板逐块铺在该混凝土面上，充分利用这类混凝土强度增长快、受力后变形较小的特点，利用隧道施工的两次出渣间隙(2～3小时)达到预制板上能通行汽车的要求。缩短了仰拱混凝土的养护时间，从而为汽车出碴提供快捷通道，达到快速施工的目的。 通过现场试验，论文确定了钢筋混凝土预制板的厚度、配筋量、几何尺等，并依据隧道正常施工的工序安排，给出隧道出碴车辆的最短行车间隔时间；最后利用有限元方法进行分析、验证。论文认为采用干硬性混凝土和钢筋混凝土预制板的组合结构修筑隧道仰拱在施工技术是经济可行的，对加快长大隧道的施工安全和整体施工进度具有重要的意义。更多还原

【Abstract】 In this paper, the long and large railway tunnel which geologic environment of its surrounding rock is complicated during the tunnel being constructed is studied, in order to control the heavy deformation of the surrounding rock and construct tunnel quickly, the in-situ experimental is made about the invert of the tunnel which combined by dry concrete and precast reinforced concrete slab, the construction technique of it is studied too.Now, increasing parallel heading and inclined shaft are the main method to construct the tunnel quickly, if the invert of tunnel is combined by dry concrete and precast reinforced concrete slab, it could increase the safety when the tunnel is being constructed and the invest would be lower than before. The technique is adopted at construction scheme of invert, when we begin construct the invert, deposit smaller slump concrete first, then lay precast reinforced concrete slab on it. Make well use of the characteristics that this type concrete strength increase quickly and its deformation is small by forced, and between two tapping time (2-3 hours), the trucks can go through it, so it shorten curing time of the invert concrete, provide the fast passage for the trucks and attain the fast-speed construction purpose.Through in-situ experimental, the paper gives the thickness, reinforcement, and geometrical modeling of the precast reinforced concrete slab. According to the normal work arranging, it gives the most short time between two tapping slag. At last the finite element method is used to analyze and verify the conclusion. The thesis thinks the technique that the invert is combined by dry concrete and reinforced concrete slab is economical and available, it is important to the construction safety and the whole degree of construction progress of long and large tunnel.更多还原