穿越岩体接触带隧道施工围岩稳定与变形研究

【作者】 阮锦楼；

【导师】 阳军生； 张学民；

【作者基本信息】 中南大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 我国南部为多山丘陵地区,地形、地质条件复杂,在高速公路隧道建设中遇到了很多复杂的地质灾害问题,而岩体接触带是隧道易发生施工地质灾害的主要地质问题之一,对此种情况下如何保证工程质量、降低工程损失的问题亟待解决。本文以湖南省汝城至郴州高速公路半江子隧道为工程依托,根据收集、汇总到的隧道工程地质勘测报告、设计图纸及施工情况,通过对岩体接触带隧道围岩进行现场施工动态监测,结合室内岩样显微观察,数值模拟结果与现场实测结果进行对比,对半江子隧道岩体接触带围岩的地质特征、变形特征和围岩的稳定性进行分析的基础上,着重分析穿越岩体接触带隧道的围岩变形特征,并进行支护参数的优化研究。主要内容如下：(1)通过综合分析大量文献资料,归纳总结目前国内外穿越岩体接触带隧道围岩变形控制的研究方法和发展现状,确定研究思路；(2)通过对现场岩样进行室内显微观察,结合现场地质素描绘制岩体接触带剖面图,并对岩体接触带地质预报结果进行分析,研究岩体接触带隧道围岩渐变特征,分析半江子隧道岩体接触带结构面对隧道围岩稳定与变形的影响；(3)考虑岩体接触带渐变特性对隧道围岩稳定与变形的影响,结合现场实测数据分析结果,利用离散元分析软件UDEC进行二维弹塑性数值模拟,建立数值计算模型,分析施工过程中围岩、支护结构的受力和变形规律以及岩体接触带对围岩稳定与变形的影响,并应用现场实测和数值模拟的结果,分析支护效果,优化支护参数。更多还原

【Abstract】 There are mainly mountainous and hilly areas in southern China with topographic and geological conditions rather complex. The construction for highway tunnel encounters a number of complicated geological problems, and the tunnel rock contact zone is prone to geological disasters, under which engineering problems like how to ensure quality and reduce losses need to be solved.This paper studies Ban Jiangzi Tunnel of Chenzhou to Rucheng highway in Hunan province. According to the collection of the tunnel engineering geology reports, design drawings and the tunnel construction, as well as the dynamic monitoring of the construction on the spot, microscopic observation of indoor rock, and comparison between numerical simulation and field test results, the paper bases the analysis on geological features, deformation characteristics and the stability of tunnel surrounding rocks around the rock contact zone in the Ban Jiangzi tunnel. The paper also focuses on rock deformation characteristics when tunnelling through rock contact zone and optimizes research on support parameters.The main ideas are as follows:(1) Based on comprehensive analysis of document materials, the domestic and foreign research methods and development status of the deformation control of surrounding rocks when tunneling through rock contact zone are summarized, and the research ideas of the paper was determined;(2) Through indoor microscopic analysis of on-site rock samples, combined with field mapping of geological sketch profiles of rock contact zone, and the geological forecast results of the rock contact zone, the paper studies the gradual change feature analysis of tunnel surrounding rock in rock contact zone, and analyzes the influence of structural surface of rock contact zone to the tunnel stability and deformation of surrounding rock in Ban Jiangzi tunnel;(3) Considering the influence of gradual change feature of rock contact zone to the stability and deformation of tunnel surrounding rock, combined with field data analysis results, the numerical model was found by using discrete element analysis software UDEC to implement numerical simulation of two-dimensional elastic-plastic. The paper analyzes the impact of the stress from surrounding supporting structures and deformation rules, the rock contact zone to the stability and deformation of tunnel surrounding rocks in the construction process. By appllying to the field measurement and numerical simulation results, the paper also analyzes the supporting effect, and optimizes the supporting parameters.更多还原