软硬交界地层重载铁路隧道施工关键技术研究

发布时间：2018-03-13 14:35

本文选题：土石分界地层　切入点：偏压　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：隧道修建需考虑的因素众多,而地质因素则为最基本因素之一。由于其未知性和复杂性,由隧道施工所引起的安全问题也尤为突出。为了保证修建过程中隧道结构的安全性和减少对洞周围岩的扰动,因地制宜地选择合理的施工方法则显得尤为重要。本文以临县隧道工程为依托,隧道沿线穿越土石分界地层,埋深浅断面大,且设计为重载铁路隧道,给施工带来极大困难和安全风险。通过对地质条件的分析,结合隧道设计和施工方法的特点和难点,以理论分析为基础,主要开展了以下研究：(1)针对隧道沿线土石分界地质情况,对土石偏压隧道结构安全性和围岩破坏模式展开研究,并对其主要影响因素进行分析。(2)结合临县隧道施工方法,对不同土石分界情况下采用的爆破控制技术进行了系统性的可行性研究。①土石分界面位于隧道外,得到了目前的爆破设计参数适用的最佳拱顶至分界面距离；②土石分界面与隧道相交,分析了爆破振动对隧道结构和围岩的影响。(3)调研了铁路隧道的病害并对其成因进行了分析；明确了重载列车荷载的数值模拟方法；采用FLAC3D模拟重载列车对隧道结构和围岩的长期作用,并结合疲劳理论对可能发生破坏位置进行预测。
[Abstract]:Tunnel construction many factors should be considered, and the geological factors is one of the most basic factors. Due to the unpredictability and complexity, the security problem caused by tunnel construction is particularly prominent. In order to ensure the construction of the tunnel structure in the process of safety and reduce the disturbance to the surrounding rock, it is very important to the choice of construction reasonable methods. This paper takes Linxian County tunnel project, along the tunnel through the rock boundary strata, shallow buried large section, and the design for heavy haul railway tunnel, bring great difficulties to the construction and safety risk. Through the analysis of the geological conditions, combined with the characteristics and difficulties of the tunnel design and construction methods, based on the theoretical analysis mainly, carry out the following research: (1) according to the geological conditions along the tunnel rock boundaries, research on the failure modes of rock and bias the structural safety of the tunnel surrounding rock, and the main To analyze the affecting factors. (2) combined with the Linxian County tunnel construction method, the control blasting technique of different soil rock interface under the feasibility study was conducted systematically. The debris is outside the tunnel, the application of blasting parameters of the current best vault to the interface and interface distance; earth tunnel intersection analysis the influence of blasting vibration on tunnel structure and surrounding rock. (3) research of the railway tunnel diseases and analyzes its causes; clear the numerical simulation method of heavy haul train load; the long-term effect of using FLAC3D to simulate the train on tunnel structure and surrounding rock of heavy load, and combined with the theory of fatigue damage may occur position prediction.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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