宁波轻轨育王岭隧道监测变形分析及围岩稳定性研究

发布时间：2018-04-17 19:06

本文选题：育王岭隧道 + 监控量测　；参考：《湖南科技大学》2015年硕士论文

【摘要】：随着近年来,国家经济越来越发达,国家对交通建筑行业投资也越来越大,城市轻轨建设为民生、经济和交通运营带来了极大便利。本文结合宁波轻轨育王岭隧道项目的工程实践进行研究,隧道位于329国道璎珞村南侧,隧道长1380m,为北仑区和鄞州区的交界处。北仑铁路货运支线紧挨通过,旁边有浙江著名古寺阿育王寺,本文主要以隧道围岩稳定性分析与评价为主,以保证施工质量和洞体安全稳定为核心,采用监测变形分析等手段,对隧道围岩稳定性进行分析。论文通过对隧址区工程地质条件分析判定围岩等级,定性评价围岩的稳定性,实时掌握监控量测数据,对围岩变形进行评估和预测,再利用数值模拟方法分析洞体施工对围岩应力应变场的影响,对隧道围岩变形破坏机制进行研究。从不同等级围岩变形的监测数据与数值模拟结果进行比较,可反馈设计和施工,对隧道建设积累一定的工程经验并最终评价围岩稳定性。论文工作主要涵盖了以下内容:首先,详细分析了育王岭隧道的工程地质条件,包括区域地质构造、区域地震、区域地层岩性等。隧址区地质条件包括地层岩性、地质构造、水文地质条件、不良地质现象等。对隧址区围岩的特征进行定性分析,根据围岩分级划分依据,划分各地段的围岩分级,不同级别的围岩有着不同的变形破坏特征,结合以上资料,对洞身围岩和出洞口以及进洞口边坡进行了围岩稳定性评价。其次,为防止隧道洞体塌方和围岩出现较大变形,影响工程质量和进度并对现场工作人员带来一定的危害,需要实施监控量测工作,主要监控进出洞口地表沉降、洞身拱顶沉降与周边收敛等,通过现场一年多量测施工得到围岩变形的数据,得出施工过程中围岩应力应变规律,在符合有关标准下,结合设计、施工和监测方案对围岩破碎、稳定性差地段进行重点监测,选取若干不同围岩等级断面根据监测成果分析围岩稳定性。最后,本文选取育王岭隧道出口围岩较破碎地段进行隧道围岩变形的数值模拟,建立起隧道三维工程地质模型,选取相关参数运用计算软件FLAC3D对隧道开挖支护前后的围岩应力应变场的特征进行研究,再结合监测数据结果进行对比分析,可反馈和指导施工,对正确评价隧道围岩稳定性有着深刻意义。论文研究成果将为隧道设计跟施工带来工程借鉴与经验。
[Abstract]:In recent years, the national economy is more and more developed, the state of traffic construction investment is also growing, city rail construction for the people's livelihood, economy and transportation has brought great convenience. Combining with the engineering practice of Ningbo light rail tunnel project of Yu Wang Ling tunnel, located on the south side of state Road 329 Ying Luo village, the length of the tunnel is 1380m, for at the junction of Beilun and Yinzhou District. Beilun railway freight line next to pass, next to the famous Zhejiang Temple Ashoka temple, based mainly on the analysis and evaluation of the stability of tunnel surrounding rock, in order to ensure construction quality and safety and stability of tunnel body as the core, the deformation monitoring methods on the stability of tunnel surrounding rock based on the analysis. The engineering geological conditions of tunnel surrounding rock stability analysis to determine the level of qualitative evaluation of surrounding rock, real-time monitoring data, the deformation of surrounding rock in evaluation and prediction Then, the numerical analysis of cave construction stress field of surrounding rock simulation, deformation and failure mechanism of the surrounding rock of the tunnel. From the comparison of monitoring data and numerical simulation of different grades of surrounding rock deformation results, the feedback of design and construction, accumulated certain experience in engineering construction on the tunnel and surrounding rock stability evaluation. The main work of the paper includes the following contents: firstly, a detailed analysis of the engineering geological conditions of Yu Wang Ling tunnel, including regional geological structure, earthquake, regional lithology. Tunnel geological conditions including lithology, geological structure, hydrogeological condition, bad geological phenomenon. The characteristics of the surrounding rock tunnel site the qualitative analysis, according to the basis of classification of surrounding rock, the division of rock classification of various sections of the surrounding rock, different levels have different deformation characteristics, combined with the above information, the hole around the body Out of the hole and the hole and rock slope of rock stability evaluation. Secondly, in order to prevent tunnel collapse and rock large deformation, bring harm to affect the project quality and schedule and personnel on site, needs the implementation of monitoring and measurement work, the main entrance and exit for monitoring surface subsidence, vault settlement and convergence of surrounding tunnel more than a year, through on-site measurement of construction rock deformation data, the surrounding rock in the construction process of stress and strain law, combining with the design in accordance with the relevant standards, and the construction and monitoring scheme of surrounding rock is broken, poor stability and lots of key monitoring, choose several different sections according to the stability analysis of the surrounding rock grade finally monitoring results. In this paper, Yu Wang Ling tunnel surrounding rock is broken in the numerical simulation of tunnel surrounding rock deformation, establish three-dimensional tunnel engineering geological model selection The relevant parameters using the feature of tunnel excavation and surrounding rock stress and strain field calculating software FLAC3D to conduct the research, combined with the monitoring data were analyzed, the feedback and guidance of construction, has a profound significance to the correct evaluation of the stability of tunnel surrounding rock. The research results will bring reference and experience for engineering design and construction of tunnel.

【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U456.3

【二级参考文献】