敖包沟隧道浅埋下穿建筑物施工技术研究与应用

发布时间：2018-02-25 03:26

本文关键词： 隧道施工技术数值计算沉降　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国是一个多山的国家,在大力发展铁路建设时,不免要建造大量隧道,以克服平面或高程的障碍,提高线路标准,降低运营成本。敖包沟隧道是巴准铁路重点工程,隧道连续穿越敖家沟西梁煤矿职工宿舍、职工食堂及西梁煤矿变电站,洞顶覆土最小厚度约20 m。隧道埋深浅,跨径大,隧道下穿过程中对地表建筑物影响大,施工风险很高。因此,有必要采取合理的施工方法确保敖包沟隧道下穿施工时建筑物的安全。本论文针对敖包沟隧道浅埋下穿建筑物面临的施工问题进行研究,分别从建筑物结构特征,隧道开挖引起的地表变形预测,隧道施工监控量测及隧道施工引起的变形规律,隧道下穿建筑物施工爆破振动测试规律几个方面对这类工程问题进行了研究,主要结论有:(1)该段隧道下穿建筑物时,围岩以软弱土为主,自稳能力较差,容易产生过大变形而引起地表过大沉降。(2)分析了地表建筑物与隧道开挖轮廓线之间的空间关系,隧道拱顶与建筑物基础底部距离较近,隧道施工开挖对建筑物的影响较大。(3)通过Peck公式、解析方法对敖包沟隧道下穿建筑物施工地表沉降值预测,预测结果为隧道下穿建筑物施工时地表变形值可达54 mm。(4)采用数值模拟软件FLAC3D分析了隧道开挖过程中的位移和应力变化规律,并根据变化规律对施工技术进行改良。(5)分析了隧道拱顶沉降、水平收敛随时间和施工步骤的变化规律,得出隧道在开挖后两周快速变形,在一月内基本趋于收敛。(6)分析了隧道施工过程中建筑物的基础沉降差,地表沉降及建筑物基础沉降随时间改变的规律,得出开挖隧道横向沉降的影响范围是20 m。(7)由功率谱、振动波形时域、振动速度这几个方面阐明了爆破振动的规律,并得到了关于敖包沟隧道下穿建筑物爆破振动的预测公式,给出了减小爆破振动的措施以及隧道浅埋下穿建筑物施工技术。
[Abstract]:China is a mountainous country. In developing railway construction, it is inevitable to build a large number of tunnels to overcome the obstacles of plane or elevation, raise the line standard, and reduce the operating cost. The tunnel passes continuously through the staff quarters, staff canteens and substations of Xiliang Coal Mine in Aojiagou Coal Mine. The minimum thickness of the overlying soil on the roof of the tunnel is about 20 m.The tunnel is deep in depth and has a long span, and it has a great impact on the surface buildings during the process of the tunnel penetrating under the tunnel. The construction risk is very high. Therefore, it is necessary to adopt reasonable construction methods to ensure the safety of the building during the construction of Aobaogou tunnel. According to the structural characteristics of the building, the prediction of the surface deformation caused by the tunnel excavation, the monitoring measurement of the tunnel construction and the deformation law caused by the tunnel construction, This kind of engineering problems are studied from several aspects of blasting vibration test law of tunnel underpass building construction. The main conclusion is: when the tunnel goes through the building under the tunnel, the surrounding rock is dominated by soft soil and its self-stability ability is poor. The spatial relationship between the surface building and the contour of tunnel excavation is analyzed. The distance between the tunnel arch and the base of the building is close. Through Peck formula, analytic method is used to predict the surface settlement value of Aobagou tunnel. The prediction results show that the surface deformation value can reach 54 mm 路L ~ (4)) the displacement and stress variation during tunnel excavation are analyzed by numerical simulation software FLAC3D. According to the change rule of the construction technology, this paper analyzes the variation law of the tunnel vault settlement, horizontal convergence with time and construction steps, and obtains the rapid deformation of the tunnel after two weeks of excavation. In January, the law of the difference of foundation settlement, ground settlement and building foundation settlement with time during tunnel construction is analyzed, and the influence range of transverse settlement of excavated tunnel is obtained by power spectrum. In this paper, the time domain and velocity of vibration wave are discussed, and the prediction formula of blasting vibration under Aobagou tunnel is obtained. The measures to reduce the blasting vibration and the construction technology of the tunnel under shallow burying are given.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

【参考文献】