铁路隧道斜穿滑坡体受力变形特征三维分析

发布时间：2018-05-26 11:26

本文选题：铁路隧道 + 滑坡　；参考：《铁道工程学报》2017年01期

【摘要】：研究目的:在工程实践中,因选线空间及线型条件受到限制,铁路隧道必须穿越滑坡体并将隧道洞门设置于滑坡上。目前已有的研究大多基于理论上的二维模型分析,而对于隧道滑坡体斜交情形,建立真三维模型能更真实地反映隧道与滑坡体的相互作用和结构受力变形特征。本文以甘钟铁路洛阳村隧道改线工程右嘴头隧道进口滑坡治理项目为背景,应用MIDAS GTS有限元计算软件建立滑坡、抗滑桩、隧道三维空间模型,模拟抗滑桩施工、路基及隧道洞身开挖支护施工过程。从数值计算结果中提取各施工步骤抗滑桩、隧道结构的受力变形数据,研究铁路隧道斜向穿越滑坡体时的受力变形特征,以及隧道洞身开挖对滑坡稳定的影响过程。研究结论:(1)隧道洞身在滑体和滑床中的受力特征分别表现为偏压和围压;(2)隧道结构纵向变形主要位于滑带附近隧道结构;(3)当隧道洞身开挖完全进入滑床段时,对滑坡的稳定及抗滑桩受力影响逐渐消失。
[Abstract]:Research purpose: in engineering practice, due to the limitation of line selection space and alignment conditions, railway tunnel must pass through the landslide and set the tunnel door on the landslide. At present, most of the existing researches are based on the theoretical analysis of two-dimensional model, but for the case of tunnel slope, the establishment of a true three-dimensional model can more truly reflect the interaction between the tunnel and the landslide and the deformation characteristics of the structure. Based on the project of landslide control in the entrance of right mouth head tunnel of Luoyang village tunnel of Ganzhong railway, this paper applies MIDAS GTS finite element calculation software to establish the three-dimensional spatial model of landslide, anti-slide pile and tunnel, and simulate the construction of anti-slide pile. Construction process of excavation and support for subgrade and tunnel. The deformation data of anti-slide pile and tunnel structure were extracted from the results of numerical calculation. The deformation characteristics of railway tunnel and the influence of tunnel excavation on landslide stability were studied. It is concluded that the longitudinal deformation of the tunnel structure is mainly located in the tunnel structure near the slip zone when the tunnel body is excavated completely into the sliding bed section, and the stress characteristics of the tunnel body in the sliding body and the sliding bed show that the longitudinal deformation of the tunnel structure is mainly located near the slip zone, and the longitudinal deformation of the tunnel structure is mainly located near the slip zone. The influence on the stability of landslide and the bearing force of anti-slide pile gradually disappeared.
【作者单位】：长安大学;中铁西安勘察设计研究院有限责任公司;
【基金】：国家自然科学基金项目(41202190)
【分类号】：U452.11

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