偏压荷载下地铁隧道变形特征及预测研究
发布时间：2018-07-14 19:48
【摘要】：以某市地铁区间隧道为研究对象,使用FLAC3D软件模拟分析了桥梁基础下浅埋暗挖法施工过程中,地铁隧道周边土体的变形和衬砌应力分布情况;同时建立了隧道拱顶沉降值的时间序列模型,并预测了拱顶沉降的变化趋势。结果表明:由于上部桥梁基础偏压和土体强度较低的影响,在开挖完成后隧道的右侧地层出现了较大的变形;同时在隧道初次衬砌两侧边墙的中部也出现了较大的应力值,对于这些隧道部位可采用锚杆注浆加固或采用钢支撑进行加强支护,以确保施工过程安全可靠;另一方面,基于ARMA模型的时间序列分析法可以较好地模拟隧道结构的复杂变形,为科学分析隧道变形特点和较准确地预测变形进行了有益的探索。
[Abstract]:Taking the subway tunnel of a city as the research object, FLAC3D software is used to simulate and analyze the deformation and stress distribution of the surrounding soil surrounding the subway tunnel under the bridge foundation under the shallow buried excavation method. At the same time, the time series model of the settlement value of the tunnel vault is set up, and the change trend of the vault settlement is premeasured. The results show that: With the influence of the partial pressure of the upper bridge and the low strength of the soil, large deformation appears in the right side of the tunnel after the completion of the excavation. At the same time, large stress values have appeared in the middle of the two side walls of the first lining of the tunnel. The construction process is safe and reliable, on the other hand, the time series analysis method based on the ARMA model can better simulate the complex deformation of the tunnel structure. It is a useful exploration for the scientific analysis of the deformation characteristics of the tunnel and the accurate prediction of the deformation.
【作者单位】： 西安科技大学建筑与土木工程学院;长安大学公路学院;
【基金】：国家自然科学基金(41172262) 陕西省教育厅科学研究计划项目(11JK0779)
【分类号】：U451
，
本文编号：2122756
[Abstract]:Taking the subway tunnel of a city as the research object, FLAC3D software is used to simulate and analyze the deformation and stress distribution of the surrounding soil surrounding the subway tunnel under the bridge foundation under the shallow buried excavation method. At the same time, the time series model of the settlement value of the tunnel vault is set up, and the change trend of the vault settlement is premeasured. The results show that: With the influence of the partial pressure of the upper bridge and the low strength of the soil, large deformation appears in the right side of the tunnel after the completion of the excavation. At the same time, large stress values have appeared in the middle of the two side walls of the first lining of the tunnel. The construction process is safe and reliable, on the other hand, the time series analysis method based on the ARMA model can better simulate the complex deformation of the tunnel structure. It is a useful exploration for the scientific analysis of the deformation characteristics of the tunnel and the accurate prediction of the deformation.
【作者单位】： 西安科技大学建筑与土木工程学院;长安大学公路学院;
【基金】：国家自然科学基金(41172262) 陕西省教育厅科学研究计划项目(11JK0779)
【分类号】：U451
，
本文编号：2122756
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