黄土隧道切槽预支护技术研究

发布时间：2018-08-26 21:32

【摘要】：本文以蒙西至华中地区铁路煤运通道南沟隧道为工程背景,研究机械切槽预支护技术在黄土隧道应用中的技术、预支护受力特征和黄土隧道稳定性特点。机械切槽预支护技术在国外,尤其是日本和法国取得了及其突出的研究成果并有大量的成功实例,国内则处于起步研究阶段至今并无工程实例,因此要对机械切槽预支护技术从工法、预支护参数、施工工艺等方面进行深入研究。针对黄土地层特征和隧道施工变形特点,本文分析了切槽预支护技术在黄土地层中应用的优势,分析预支护结构安全性和周边围岩变形,并与传统支护进行对比分析,以保障了黄土隧道切槽预支护的安全。本文利用大型有限差分软件FLAC 3D进行黄土围岩隧道施工过程的三维数值模拟分析,研究黄土围岩铁路隧道机械切槽预支护后全断面法和台阶法两种开挖工法,比较两种工法工程特点,从位移、应力和塑性区方面优化施工方法;研究施工中掌子面超前加固、隧道开挖进尺、仰拱封底时间、切槽厚度、切槽开挖顺序以及切槽开挖分区等技术参数,提出较为合理的工艺参数;研究不同埋深条件下的预支护结构的安全度,论证机械切槽预支护技术在黄土隧道施工中的可行性。
[Abstract]:Based on the Nangou tunnel of railway coal transport channel from Mengxi to central China, this paper studies the application of mechanical slot pre-supporting technology in loess tunnel, the mechanical characteristics of pre-support and the stability of loess tunnel. In foreign countries, especially in Japan and France, mechanical slot cutting pre-support technology has made outstanding research results and has a large number of successful examples. However, there are no engineering examples in China until now in the initial stage of research. Therefore, it is necessary to study the pre-support technology of mechanical slot cutting from the aspects of engineering method, pre-support parameters, construction technology and so on. In view of the characteristics of loess layer and tunnel construction deformation, this paper analyzes the advantages of the pre-support technology applied in loess layer, analyzes the security of pre-support structure and surrounding rock deformation, and compares it with the traditional support. In order to ensure the safety of the loess tunnel slot-cutting pre-support. In this paper, a large-scale finite difference software FLAC 3D is used to simulate and analyze the construction process of loess surrounding rock tunnel, and two excavation methods, full section method and step method, are studied. Comparing the characteristics of the two engineering methods, optimizing the construction methods from the aspects of displacement, stress and plastic zone, studying the ahead reinforcement of the face of the palm in construction, the excavation of the tunnel, the time of sealing the bottom of the inverted arch, the thickness of the cut groove, The technical parameters such as cutting order and cutting section are put forward, the safety degree of pre-support structure under different buried depth is studied, and the feasibility of mechanical pre-support technology in loess tunnel construction is demonstrated.
【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】：U455.7

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