浅埋软弱围岩隧道施工方法及力学响应研究
发布时间：2019-07-04 13:14
【摘要】：在山岭隧道进出口段及城市轨道交通隧道中,多为浅埋软弱围岩隧道,其水文地质条件差,埋深浅,岩土体自稳能力差,抗扰动能力弱,甚至存在隧道下穿或紧邻其它既有建筑物、构筑物等现象,一旦工程措施(包括设计措施)和施工方法不当,将极易发生初期支护变形侵限,甚至隧道坍方等工程事故,这些问题亟待解决。本文以广西永贺高速公路大岭头隧道浅埋软弱围岩段工程实践为依托工程,综合应用理论计算、有限元数值模拟和现场实测等手段,进行了如下研究:(1)分析总结了有限元在隧道工程中的应用,应用解析公式法分析圆形隧道围岩应力状态,得到了弹性条件下及弹塑性条件下圆形隧道的应力解析解,分析了各个相应指标和塑性区半径大小的关系。(2)运用有限元数值模拟的方法研究分析了浅埋软弱围岩隧道力学特征及变形特征,重点对比分析了浅埋软弱V级围岩隧道施工过程中“掌子面前方超前变形”、“掌子面变形”、“掌子面后方变形”的比例关系,发现在超前变形中拱顶沉降最为显著,拱顶处的超前预加固及预支护有重要的意义。(3)运用有限元数值模拟分析的方法,选取三种典型浅埋软弱围岩隧道,分别采用CRD法、CD法、预留核心土台阶法及台阶法,以及有无超前支护措施,重点对比分析有、无超前预加固措施应力场和位移场的变化,验证了超前预加固措施是控制浅埋软弱围岩隧道结构及其围岩变形的有效措施之一,并通过有限指标的定量比较,得出三种浅埋软弱围岩,四种不同施工方法、一种超前预加固措施的适应性。(4)依托广西永贺高速公路大岭头隧道浅埋软弱围岩段的工程实践,运用有限元数值方法,模拟分析其采用超前小导管注浆预加固留核心土台阶法施工过程,总结分析其应力、应变、位移变化规律,得到其支护结构的安全系数均在安全范围内,验证了其安全性。(5)对广西永贺高速公路大岭头隧道进行现场实测研究,对其监控量测的数据进行处理和回归分析研究,并对比分析现场监控量测数据处理结果与数值模拟结果,结果表明数值模拟结果与现场监控量测结果较吻合。
文内图片：
图片说明：浅埋软弱围岩隧道发生工程事故图
[Abstract]:In the entrance and exit section of Shanling tunnel and urban rail transit tunnel, most of them are shallow buried weak surrounding rock tunnels, whose hydrogeological conditions are poor, buried depth is shallow, rock and soil self-stability ability is poor, anti-disturbance ability is weak, and there are even phenomena such as passing through or adjacent to other existing buildings and structures under the tunnel. Once the engineering measures (including design measures) and construction methods are improper, the initial support deformation will easily occur. Even tunnel collapse and other engineering accidents, these problems need to be solved urgently. Based on the engineering practice of shallow soft surrounding rock section of Daling head tunnel on Yonghe Expressway in Guangxi, this paper makes the following research by means of theoretical calculation, finite element numerical simulation and field measurement: (1) the application of finite element method in tunnel engineering is analyzed and summarized, and the stress state of surrounding rock of circular tunnel is analyzed by analytical formula method. The analytical solution of stress of circular tunnel under elastic condition and elastic-plastic condition is obtained, and the relationship between each index and the radius of plastic zone is analyzed. (2) the mechanical characteristics and deformation characteristics of shallow soft surrounding rock tunnel are studied and analyzed by using finite element numerical simulation method, and the "ahead deformation in front of palm face" and "deformation in front of palm surface" in the construction process of shallow soft V class surrounding rock tunnel are compared and analyzed. The proportional relationship of "deformation behind the palm surface" shows that the settlement of the arch roof is the most significant in the advance deformation, and the advance pre-reinforcement and pre-support at the arch roof are of great significance. (3) by using the finite element numerical simulation analysis method, three typical shallow surrounding rock tunnels are selected, using CRD method, CD method, reserved core soil step method and step method, as well as the existence of advance support measures, with emphasis on comparative analysis. Without the change of stress field and displacement field of pre-reinforcement measures, it is verified that the pre-reinforcement measure is one of the effective measures to control the deformation of shallow soft surrounding rock tunnel structure and its surrounding rock. Through the quantitative comparison of finite indexes, three kinds of shallow soft surrounding rock and four different construction methods are obtained. A kind of adaptability of advance pre-reinforcement measures. (4) based on the engineering practice of shallow soft surrounding rock section of Daling head tunnel of Yonghe Expressway in Guangxi, the construction process of retaining core soil step method by using finite element numerical method is simulated and analyzed, and the variation laws of stress, strain and displacement are summarized and analyzed, and the safety factors of its supporting structure are all in the safe range. The safety of the tunnel is verified. (5) the field measurement of Daling head tunnel of Yonghe Expressway in Guangxi is carried out, the data of monitoring and measurement are processed and analyzed by regression analysis, and the data processing results of field monitoring and measurement are compared with the results of numerical simulation. The results show that the numerical simulation results are in good agreement with the results of field monitoring and measurement.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U455.4
本文编号：2509943
文内图片：
图片说明：浅埋软弱围岩隧道发生工程事故图
[Abstract]:In the entrance and exit section of Shanling tunnel and urban rail transit tunnel, most of them are shallow buried weak surrounding rock tunnels, whose hydrogeological conditions are poor, buried depth is shallow, rock and soil self-stability ability is poor, anti-disturbance ability is weak, and there are even phenomena such as passing through or adjacent to other existing buildings and structures under the tunnel. Once the engineering measures (including design measures) and construction methods are improper, the initial support deformation will easily occur. Even tunnel collapse and other engineering accidents, these problems need to be solved urgently. Based on the engineering practice of shallow soft surrounding rock section of Daling head tunnel on Yonghe Expressway in Guangxi, this paper makes the following research by means of theoretical calculation, finite element numerical simulation and field measurement: (1) the application of finite element method in tunnel engineering is analyzed and summarized, and the stress state of surrounding rock of circular tunnel is analyzed by analytical formula method. The analytical solution of stress of circular tunnel under elastic condition and elastic-plastic condition is obtained, and the relationship between each index and the radius of plastic zone is analyzed. (2) the mechanical characteristics and deformation characteristics of shallow soft surrounding rock tunnel are studied and analyzed by using finite element numerical simulation method, and the "ahead deformation in front of palm face" and "deformation in front of palm surface" in the construction process of shallow soft V class surrounding rock tunnel are compared and analyzed. The proportional relationship of "deformation behind the palm surface" shows that the settlement of the arch roof is the most significant in the advance deformation, and the advance pre-reinforcement and pre-support at the arch roof are of great significance. (3) by using the finite element numerical simulation analysis method, three typical shallow surrounding rock tunnels are selected, using CRD method, CD method, reserved core soil step method and step method, as well as the existence of advance support measures, with emphasis on comparative analysis. Without the change of stress field and displacement field of pre-reinforcement measures, it is verified that the pre-reinforcement measure is one of the effective measures to control the deformation of shallow soft surrounding rock tunnel structure and its surrounding rock. Through the quantitative comparison of finite indexes, three kinds of shallow soft surrounding rock and four different construction methods are obtained. A kind of adaptability of advance pre-reinforcement measures. (4) based on the engineering practice of shallow soft surrounding rock section of Daling head tunnel of Yonghe Expressway in Guangxi, the construction process of retaining core soil step method by using finite element numerical method is simulated and analyzed, and the variation laws of stress, strain and displacement are summarized and analyzed, and the safety factors of its supporting structure are all in the safe range. The safety of the tunnel is verified. (5) the field measurement of Daling head tunnel of Yonghe Expressway in Guangxi is carried out, the data of monitoring and measurement are processed and analyzed by regression analysis, and the data processing results of field monitoring and measurement are compared with the results of numerical simulation. The results show that the numerical simulation results are in good agreement with the results of field monitoring and measurement.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U455.4
【参考文献】
相关期刊论文 前10条
1 范小伟;徐林生;;长冲隧道进口段开挖方法的优化分析[J];重庆交通大学学报(自然科学版);2008年02期
2 郭健;顾正维;孙炳楠;陈勇;;基于小波分析的桥梁健康监测方法[J];工程力学;2006年12期
3 余伟健;高谦;余良晖;;松散围岩强化支护技术研究及其可靠性分析[J];金属矿山;2006年06期
4 王德志;;榆树沟隧道施工监控量测及分析[J];公路隧道;2006年02期
5 吕建刚,邢志,李猛;小波分析在路面反应谱中信号降噪的应用[J];振动工程学报;2005年02期
6 李文秀,翟淑花,乔金丽;隧道开挖引起地表下沉及其影响分析[J];岩石力学与工程学报;2004年S2期
7 黄娟,王伟,彭立敏;大跨浅埋隧道采用台阶法施工的安全性评估[J];西部探矿工程;2004年12期
8 李常文,周景林,韩洪德;组合拱支护理论在软岩巷道锚喷设计中应用[J];辽宁工程技术大学学报;2004年05期
9 芮勇勤,岳中琦,唐春安,杨天鸿,陆培炎;隧道开挖方式对建筑物桩基影响的数值模拟分析[J];岩石力学与工程学报;2003年05期
10 何满潮,景海河,孙晓明;软岩工程地质力学研究进展[J];工程地质学报;2000年01期
相关博士学位论文 前2条
1 李新志;超浅埋大跨度连拱隧道围岩受力分析及工程应用研究[D];山东大学;2013年
2 吴波;复杂条件下城市地铁隧道施工地表沉降研究[D];西南交通大学;2003年
相关硕士学位论文 前2条
1 方俊;隧道洞口段施工弹塑性数值模拟及变形监测的数据分析[D];浙江大学;2007年
2 吴永照;多跨浅埋暗挖隧道地面沉降控制技术研究[D];中南大学;2006年
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