【作者】 张伟；

【导师】 石少帅； 纪尊众；

【作者基本信息】 山东大学 ， 工程硕士（专业学位）， 2017， 硕士

【摘要】 随着我国经济的高速增长,铁路、公路、水电、国防、城市地铁等领域,都产生了大量的隧道与地下工程,特别是城市轨道的建设,有数量相当大的浅埋隧道形成,对浅埋隧道的研究显得尤为重要。本文主要通过现场试验和数值模拟相结合的研究方法,再结合蟠龙山隧道工程,对超浅埋围岩稳定性进行了研究,并对其进行支护优化,主要研究内容及创新点如下:(1)总结归纳了国内外隧道围岩稳定性研究现状,特别是浅埋公路隧道的研究现状,学习围岩稳定性分析理论,总结影响隧道围岩稳定性的影响因素,对三维快速拉格朗日进行了重点介绍。(2)通过系统收集与归纳整理隧道失稳百余例典型地质雷达数据以及参考相关文献,遴选出围岩级别、开挖跨度、岩体完整情况、隧道埋深、偏压角度、地下水影响和施工管理与技术水平七个主要因素作为隧道围岩稳定性风险评价指标,建立了隧道围岩风险评估模型。(3)依据实际工程尺寸,结合圣维南原理确定数值模型尺寸,并利用ANSYS建立模型划分网格,在FALC中模拟现场施工开挖支护工序,进行数值计算,并分析长距离超浅埋隧道围岩变形规律。(4)开展施工中围岩变形和围岩压力监测现场试验,对超浅埋断面持续监测收集数据,结合数值模拟围岩变形规律,对围岩的支护变形控制提出优化设计,并修改数值计算模型中的支护参数,验证围岩变形优化结果。更多还原

【Abstract】 With the rapid growth of China’s economy,a large number of tunnels and underground engineering have been constructed,such as railway,highway,water and electricity,national defense,city metro and so on.Especially the urban rail construction have made a fairly large shallow buried tunnel.As a result,it is particularly important for us to research shallow buried tunnel research.This paper mainly through the field test and numerical simulation,combining the project of PanLong tunnel,researching the shallow buried the stability of surrounding rock,and supporting optimization,the main research contents is as follows:(1)This paper summarize the surrounding rock stability research status at home and abroad,especially the research status of shallow-buried highway tunnel,learning theory of surrounding rock stability analysis,summarizes the factors of affecting the stability of surrounding rock,and the three-dimensional fast Lagrangian were introduced.(2)Through system collects and sums up the tunnel instability hundreds cases of typical geological radar data,and the reference literature,selected level of surrounding rock,rock mass integrity condition,excavation span,tunnel buried depth of ground water,bias Angle,and construction management and technical level seven main factors as the risk of tunnel surrounding rock stability evaluation index and risk evaluation model of tunnel surrounding rock is established.(3)According to the actual project size,and combining with the size of saint venant principle to deside the size of model,and using ANSYS to establish model partitioning grids.Finally,simulating the construction excavation supporting process,in the FALC,and analysing the deformation law of surrounding rock of long distance shallow buried tunnel.(4)Monitoring the deformation and stress of surrounding rock during construction,Collecting the monitoring data of the shallow buried section continuous,Combining with numerical simulation of the deformation law of surrounding rock to control the deformation of surrounding rock and put forward support optimization design,and modify the numerical calculation of supporting parameters in the model,to verificat the deformation of surrounding rock to optimize the results.更多还原