华蓥山隧道论文南大梁高速公路华蓥山隧道采空区施工技术研究.doc

华蓥山隧道论文：南大梁高速公路华蓥山隧道采空区施工技术研究【中文摘要】目前国内在公路下伏采空区施工和防护加固方面的理论研究和工程实践较多,而公路隧道、铁路隧道方面的研究则较少。本文以南大梁高速公路华蓥山隧道为工程背景,在系统分析和总结华蓥山隧道及国内外采空区段破碎围岩施工经验的基础上,通过数值仿真模拟得出采空区对隧道的安全性影响,提出了安全通过采空区段的施工技术。主要对以下几个方面进行了研究。1、隧道采空区范围工程地质条件研究结合工程地质勘察资料,确定采空区和隧道围岩物理力学参数,查明采空区分布范围、围岩分级、变形稳定情况。2、采空区与隧道结构相互作用及施工方法研究建立理论分析模型,采用数值分析方法模拟隧道施工过程,分析施工过程中围岩及支护结构的力学行为、采空区对隧道结构的影响、围岩稳定性态等,以此来提出影响隧道施工的安全距离,以此定性的判断采空区对隧道的影响。提出隧道施工的合理施工方案及加固措施。分析判断施工方案的合理性、支护手段的必要性,及时调整施工工法及辅助措施,以确保隧道施工安全和运营安全。3、采空区的注浆治理研究。建立数值模拟模型,对华蓥山隧道进口段急倾斜采空区在隧道下方时的强影响区进行注浆加固治理进行模拟,并对模拟效果做出一个评价,以此定性的分析注浆加固的效果。4、华蓥山隧道采空区地段施工技术研究在总结以往工程经验和数值模拟的基础上,提出了适合华蓥山隧道采空区路段的具体施工技术,为施工提供指导。【英文摘要】At present, there is much theoretical research and engineering practice about the construction, protection and consolidation of the lower goaf area of the highway in china, while the research on those of the highway and railway tunnels is relatively less.Therefore, taken Huayingshan Tunnel of Nandaliang Highway as engineering background and based upon the systematical analysis and conclusion of Huayingshan Tunnel and the construction experience of goaf area in crushed surrounding rock at home and abroad, this paper gets the safety influence of goaf areas upon tunnels through numerical simulation and then proposes the construction technique of safe passing the goaf area. The main research in this paper is as follows:1. the research on geological conditions of tunnel scope engineering;Combined with the materials of the engineering geological investigation, physical and mechanical parameters are determined, and the distribution range, the classification of surrounding rock and the stability of deformation are ascertained.2. the research on the interaction between goaf areas and tunnel structures, and the construction methods.By building the theory analysis model, adopting the numerical analysis method to simulate the process of tunnel construction, and analyzing the mechanical behavior of surrounding rock and supporting structure and the influences of goaf area upon the tunnel structure and the stability of surrounding rock, the safe distance that affects tunnel construction can be put forward, and the impact of goaf area on tunnels also can be estimated qualitatively. Consequently, reasonable construction plans and reinforcement measures of tunnel construction can be found. Then, the reasonability of construction plans, the necessity of the supporting devices should be assessed. To ensure tunnel construction and operation safety, construction methods and assistant measures should be adjusted timely.3. the research on pouring treatment of goaf areaFirstly, the numerical simulation model is built. Then the grouting consolidation treatment, which is done in the influential area of the steeply inclined goaf area in the entrance region of Huayingshan Tunnel in the tunnel lower part is simulated. At the same time, the evaluation about effects of the simulation should be made, and then results of the grouting consolidation can be analyzed from the qualitative perspective.4. the research on construction technique of the goaf area of Huayingshan TunnelBased on the previous engineering experience and numerical simulation. the specific construction techniques of goaf area of Huayingshan Tunnel are proposed, which can provide directions for future construction.【关键词】华蓥山隧道 采空区 数值模拟 安全性影响 施工技术【英文关键词】Huayingshan Tunnel goaf area numerical simulation safety influence construction technique【目录】南大梁高速公路华蓥山隧道采空区施工技术研究摘要6-7Abstract7-8第一章 绪论12-231.1 研究背景12-131.2 工程概况13-151.2.1 地形地貌141.2.2 地层岩性141.2.3 地质构造14-151.3 国内外研究现状15-201.3.1 地下采空区探测技术15-161.3.2 采空区稳定性分析及治理技术研究16-181.3.3 采空区围岩变形特性与数值模拟研究18-191.3.4 煤矿采空区病害分析及其防治措施191.3.5 隧道通过煤矿采空区施工技术19-201.4 存在的问题20-211.5 研究内容及手段21-231.5.1 主要研究内容21-221.5.2 研究手段22-23第二章 华蓥山隧道采空区概述23-322.1 采空区及三带划分的标准23-252.2 华蓥山隧道采空区变形及岩体变形特征25-292.2.1 华蓥山隧道采空区状况25-262.2.2 华蓥山隧道采空区变形计算及预测26-292.3 采空区对华蓥山隧道影响和关系29-322.3.1 采空区对华蓥山隧道的影响29-302.3.2 采空区与华蓥山隧道的关系30-32第三章 采空区对华蓥山隧道施工安全性的影响研究32-573.1 ANSYS隧道模拟及参数计算方法32-363.1.1 隧道开挖模拟32-333.1.2 DP材料、DP屈服准则33-343.1.3 围岩强度发挥系数计算34-353.1.4 衬砌安全系数计算35-363.2 施工方法的选择36-383.3 华蓥山隧道倾斜采空区对隧道施工安全的影响38-483.3.1 ANSYS模型介绍及参数的选取38-403.3.2 采空区距离隧道顶部不同高度对隧道施工安全性的影响40-443.3.3 采空区距离隧道底部不同高度对隧道施工安全性的影响44-483.4 三维有限元模拟急倾斜采空区对隧道施工安全的影响48-553.4.1 ANSYS模型介绍49-503.4.2 计算结果分析50-553.5 小结55-57第四章 华蓥山隧道采空区注浆治理的三维有限元分析57-654.1 参数的选取574.2 注浆界限选取及注浆加固顺序57-594.2.1 注浆加固顺序584.2.2 注浆工艺58-594.3 模型计算结果分析59-644.3.1 围岩变形分析59-614.3.2 衬砌关键点等效应力分析61-624.3.3 塑性区规律特征62-644.4 小结64-65第五章 华蓥山隧道采空区地段施工方案设计65-725.1 超前地质预报65-67