武深高速公路吉家坡隧道施工围岩稳定性研究
发布时间：2019-02-11 09:16
【摘要】：本文依托武深高速吉家坡隧道项目,在整理该工程区域的地质资料,隧道设计支护方案的基础上,结合超前地质预报、监控量测以及数值模拟分析三方面去综合分析隧道围岩稳定性。预知前方地质情况是确保施工安全,施工过程中围岩稳定性的先决条件,首先对比各类超前地质预报方法发现单一的超前地质预报手段并不能很好的预测前方地质,常常需要多种探测方法的综合运用,弥补各自的不足,形成一个较为完整的地址超前预报,为施工安全提供有力的保障。吉家坡隧道主要运用了地质素描法、TGP以及地质雷达三种手段。监控量测是指导施工的重要手段,通过对其采集数据的处理分析,可以有效的对围岩稳定性进行一个大致的预判,而其采集的数据往往与时间和空间呈现出一定的规律性,得到四种形式的变化曲线。依据规范中所规定的判定围岩稳定的标准,可以通过对数据的整理分析得出本隧道的围岩稳定情况,大约与掌子面相距3倍洞径时,可以进行二次衬砌的施作。本文主要通过有限元软件数值模拟分析小净距隧道浅埋段不同覆盖层厚度的影响、浅埋段不同开挖顺序的影响、深埋段不用围岩级别的影响、深埋段不同净距的影响以及深埋段不同施工方法的影响。可得到以下结论:围岩变形随着覆盖层厚度增加而增加;先开挖深埋侧洞室后开挖浅埋侧洞室更有利于围岩稳定;围岩变形随着围岩级别的增加而减小;14m可能是小净距隧道的最优净距;CRD工法为最优的施工方法,台阶法是最简单易行的的施工方法。同时,由于围岩稳定性较差会严重影响到二次衬砌的安全,加上在施工过程中,二次衬砌的顶部以及拱肩部位常常因为混凝土填充不密实,导致其厚度不够。本文创新点在于对浅埋偏压段的不等厚二次衬砌的安全性分析,分析可知随着拱顶以及拱肩位置厚度的减小,二次衬砌的轴力呈递增的趋势,而弯矩则呈现出递减的趋势,且二次衬砌的安全系数全部为减小趋势,衬砌破坏范围不断增加。所得结论可为实际工程设计和施工提供一定的参考,及时做好支护和防范工作。
[Abstract]:Based on the Wu-Shen High-speed Jijiapo Tunnel Project, this paper combines the advanced geological forecast with the geological data of the project area and the tunnel design and support scheme. Monitoring measurement and numerical simulation analysis are used to analyze the stability of tunnel surrounding rock. It is a prerequisite to ensure the safety of construction and the stability of surrounding rock in the construction process to predict the geological situation in front. First of all, comparing various kinds of advanced geological forecasting methods, we find that a single method of advanced geological prediction can not predict the geology in front of us very well. It often needs the comprehensive application of various detection methods to make up for their respective shortcomings and form a relatively complete advance prediction of the address to provide a strong guarantee for the construction safety. Jijiapo Tunnel mainly uses geological sketch, TGP and GPR. Monitoring and measuring is an important means to guide construction. By processing and analyzing the collected data, we can effectively predict the stability of surrounding rock, and the collected data often show certain regularity with time and space. Four forms of curves are obtained. According to the criterion of judging the stability of surrounding rock, the stability of surrounding rock of the tunnel can be obtained by analyzing the data. When the tunnel is about 3 times diameter apart from the face of the face, the secondary lining can be applied. In this paper, the influence of different overburden thickness, different excavation sequence of shallow buried section, and no influence of surrounding rock level on deep buried section are analyzed by numerical simulation of finite element software. The influence of different net distance of deep buried section and different construction method of deep buried section. The following conclusions can be obtained: the deformation of surrounding rock increases with the increase of overburden thickness; first excavation of deep buried cavern and then excavation of shallow side cavern are more beneficial to the stability of surrounding rock; the deformation of surrounding rock decreases with the increase of surrounding rock level. The CRD method is the best construction method, and the step method is the most simple one. At the same time, the poor stability of the surrounding rock will seriously affect the safety of the secondary lining, and in the construction process, the top of the secondary lining and the arch shoulder are often not dense because of the concrete filling, resulting in the thickness of the secondary lining is not enough. The innovation of this paper lies in the analysis of the safety of the secondary lining with different thickness in the shallow burying partial pressure section. The analysis shows that the axial force of the secondary lining increases with the decrease of the arch roof and the thickness of the arch shoulder, while the bending moment shows a decreasing trend. And the safety factor of the secondary lining is decreasing, and the damage range of the lining is increasing. The conclusions can provide some references for practical engineering design and construction, and timely support and prevention work.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2
本文编号：2419593
[Abstract]:Based on the Wu-Shen High-speed Jijiapo Tunnel Project, this paper combines the advanced geological forecast with the geological data of the project area and the tunnel design and support scheme. Monitoring measurement and numerical simulation analysis are used to analyze the stability of tunnel surrounding rock. It is a prerequisite to ensure the safety of construction and the stability of surrounding rock in the construction process to predict the geological situation in front. First of all, comparing various kinds of advanced geological forecasting methods, we find that a single method of advanced geological prediction can not predict the geology in front of us very well. It often needs the comprehensive application of various detection methods to make up for their respective shortcomings and form a relatively complete advance prediction of the address to provide a strong guarantee for the construction safety. Jijiapo Tunnel mainly uses geological sketch, TGP and GPR. Monitoring and measuring is an important means to guide construction. By processing and analyzing the collected data, we can effectively predict the stability of surrounding rock, and the collected data often show certain regularity with time and space. Four forms of curves are obtained. According to the criterion of judging the stability of surrounding rock, the stability of surrounding rock of the tunnel can be obtained by analyzing the data. When the tunnel is about 3 times diameter apart from the face of the face, the secondary lining can be applied. In this paper, the influence of different overburden thickness, different excavation sequence of shallow buried section, and no influence of surrounding rock level on deep buried section are analyzed by numerical simulation of finite element software. The influence of different net distance of deep buried section and different construction method of deep buried section. The following conclusions can be obtained: the deformation of surrounding rock increases with the increase of overburden thickness; first excavation of deep buried cavern and then excavation of shallow side cavern are more beneficial to the stability of surrounding rock; the deformation of surrounding rock decreases with the increase of surrounding rock level. The CRD method is the best construction method, and the step method is the most simple one. At the same time, the poor stability of the surrounding rock will seriously affect the safety of the secondary lining, and in the construction process, the top of the secondary lining and the arch shoulder are often not dense because of the concrete filling, resulting in the thickness of the secondary lining is not enough. The innovation of this paper lies in the analysis of the safety of the secondary lining with different thickness in the shallow burying partial pressure section. The analysis shows that the axial force of the secondary lining increases with the decrease of the arch roof and the thickness of the arch shoulder, while the bending moment shows a decreasing trend. And the safety factor of the secondary lining is decreasing, and the damage range of the lining is increasing. The conclusions can provide some references for practical engineering design and construction, and timely support and prevention work.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2
【参考文献】
相关期刊论文 前2条
1 刘杰;廖春木;;TRT技术在隧道地质超前预报中的应用[J];铁道建筑;2011年04期
2 朱素平，周楚良;地下圆形隧道围岩稳定性的粘弹性力学分析[J];同济大学学报(自然科学版);1994年03期
相关硕士学位论文 前1条
1 申禄坤;公路隧道结构安全性评价体系及评价方法研究[D];西南交通大学;2007年
，本文编号：2419593
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