岩溶隧道岩盘安全厚度计算方法及突水灾害发生机理研究
发布时间：2018-09-17 19:44
【摘要】：鉴于我国岩溶隧道施工过程中频繁遭遇的突水灾害造成重大损失和人员伤亡的现状,本项目以防止岩溶隧道突水灾害发生为目的,结合国内外突水灾害案例,依托国家安全生产监督管理总局项目“岩溶隧道桥隧过渡段围岩稳定性及施工力学行为研究”和四川教育厅科技计划项目“岩溶隧道突水灾害发生机理及防治措施研究”,以圆梁山隧道为背景,通过文献调研,归纳分析了岩溶隧道突水灾害特征及其影响因素,在此基础上分别推导出溶腔隐伏洞分别分布于岩溶隧道顶部、侧部和底部时的岩盘安全厚度值,并利用数值分析方法深入研究了岩溶隧道突水灾害发生机理及其防治措施,以期解决岩溶隧道防治突水灾害设计中的不足和难点。主要研究成果如下： (1)对国内外岩溶隧道突水、突泥灾害事故进行总结和归类,明确突水突泥灾害对工程的巨大危害作用；对岩溶突水机理的研究现状进行了总结,指出目前研究存在的科学问题,明确研究目的、内容和方法。分析岩溶隧道突水灾害特征和岩溶隧道突水灾害的影响因素,相关研究有助于加深人们对岩溶隧道突水灾害的理解和认识。 (2)将岩溶隧道岩盘简化为结构力学模型,分别考虑溶腔隐伏洞分别位于隧道顶部、底部以及侧部时,按抗弯以及抗剪强度推导出岩盘安全厚度的解析表达式。理论结果得出的岩盘厚度值与工程实际预留的安全厚度值比较接近,结果验证了理论公式的合理性。 (3)以FLAC3D数值软件为基础,建立了隐伏溶腔分别位于隧道顶部、底部以及侧部时三种数值计算模型,并将溶腔内水压力简化为溶腔内等效的法向应力。根据水压力以及位移增长曲线可以判断出了岩盘发生破坏的临界水压力,进而得出水压力和岩盘安全厚度之间的关系曲线；数值结果和理论结果对比发现：数值结果得出的岩盘安全厚度值比理论结果稍微偏小,但是安全厚度值随水压力的增长率基本相当。 (4)结合圆梁山隧道毛坝向斜2#溶洞的相关特点,整理了针对2#溶洞突水防治的主要方法,为了验证注浆对隧道稳定性的影响,通过FLAC3D对注浆效果进行了检验,对比注浆前后岩盘受到的最大剪应力、最大主应力以及位移状况,得到以下结论：注浆后隧道周边围岩最大剪应力、最大主应力以及岩盘发生的最大位移值都有一定程度的减少,说明注浆后围岩的整体强度得到明显的提升,围岩的抵抗溶腔高水压的能力得到明显加强。 (5)圆梁山2#溶腔周边的监测资料显示,衬砌受到的压应力比数值模拟结果明显偏大,说明有两种可能：一是围岩周边存在的水压力大于4MPa；二是FLAC3D在计算的过程中没有考虑到实际围岩存在的结构面问题,采用的围岩参数比实际围岩参数更好。
[Abstract]:In view of the serious loss and casualties caused by the frequent water inrush disasters in the construction of karst tunnels in China, this project aims at preventing the water inrush disasters in karst tunnels, combining with the cases of water inrush disasters at home and abroad. Based on the project of the State Administration of production Safety Supervision and Administration "study on the Stability of surrounding Rock and Construction Mechanics behavior of the transition Section of Karst Tunnel Bridge and Tunnel" and the project of Science and Technology Plan of Sichuan Education Office, "study on Mechanism and Prevention measures of Water inrush disaster in Karst Tunnel", Based on the background of Yuanliangshan Tunnel, the characteristics of karst tunnel water inrush disaster and its influencing factors are summarized and analyzed through literature investigation. On the basis of this, it is deduced that the buried cave of dissolved cavity distributes on the top of karst tunnel respectively. The safety thickness of the rock plate at the side and the bottom is studied. The mechanism of the karst tunnel water inrush disaster and its prevention measures are deeply studied by using the numerical analysis method in order to solve the deficiency and difficulty in the design of the karst tunnel water inrush disaster prevention. The main research results are as follows: (1) summing up and classifying the accidents of water inrush and mud inrush in karst tunnels at home and abroad, clarifying the great harm effect of water and mud inrush disaster to engineering, summarizing the present research situation of karst water inrush mechanism, This paper points out the scientific problems existing in the present research, and clarifies the purpose, contents and methods of the research. The characteristics of karst tunnel water inrush disaster and the influencing factors of karst tunnel water inrush disaster are analyzed. The relevant research is helpful to deepen people's understanding and understanding of karst tunnel water inrush disaster. (2) the karst tunnel rock plate is simplified as a structural mechanics model. When the cavities are located at the top, bottom and side of the tunnel respectively, the analytical expressions of the safe thickness of the rock plate are derived according to the bending and shear strength. The thickness of the rock plate obtained from the theoretical results is close to that of the safety thickness reserved in engineering practice. The results verify the rationality of the theoretical formula. (3) based on the FLAC3D numerical software, the concealed cavities are respectively located at the top of the tunnel. At the bottom and the side, the water pressure in the cavity is simplified to equivalent normal stress in the cavity. According to the water pressure and displacement growth curve, the critical water pressure can be determined, and the relationship between the water pressure and the safe thickness of the rock plate can be obtained. By comparing the numerical results with the theoretical results, it is found that the safe thickness of the rock plates obtained by the numerical results is slightly smaller than that of the theoretical results. But the safe thickness value is basically the same with the increase rate of water pressure. (4) combined with the relevant characteristics of Maoba syncline of Yuanliangshan Tunnel, the main methods of preventing and controlling the water inrush from the cavern in 2# are sorted out. In order to verify the influence of grouting on tunnel stability, the grouting effect was tested by FLAC3D, and the maximum shear stress, maximum principal stress and displacement were compared before and after grouting. The following conclusions are obtained: the maximum shear stress, the maximum principal stress and the maximum displacement of the surrounding rock around the tunnel after grouting have been reduced to a certain extent, which indicates that the overall strength of the surrounding rock after grouting is obviously enhanced. The ability of surrounding rock to resist the high water pressure of the cavity is obviously strengthened. (5) the monitoring data around the cavity around Yuanliangshan show that the compressive stress of the lining is obviously larger than that of the numerical simulation results. It shows that there are two possibilities: one is that the water pressure around the surrounding rock is more than 4 MPA, the other is that FLAC3D does not take into account the structural plane problem of the actual surrounding rock in the calculation process, and the parameters of the surrounding rock are better than those of the actual surrounding rock.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.11
本文编号：2246899
[Abstract]:In view of the serious loss and casualties caused by the frequent water inrush disasters in the construction of karst tunnels in China, this project aims at preventing the water inrush disasters in karst tunnels, combining with the cases of water inrush disasters at home and abroad. Based on the project of the State Administration of production Safety Supervision and Administration "study on the Stability of surrounding Rock and Construction Mechanics behavior of the transition Section of Karst Tunnel Bridge and Tunnel" and the project of Science and Technology Plan of Sichuan Education Office, "study on Mechanism and Prevention measures of Water inrush disaster in Karst Tunnel", Based on the background of Yuanliangshan Tunnel, the characteristics of karst tunnel water inrush disaster and its influencing factors are summarized and analyzed through literature investigation. On the basis of this, it is deduced that the buried cave of dissolved cavity distributes on the top of karst tunnel respectively. The safety thickness of the rock plate at the side and the bottom is studied. The mechanism of the karst tunnel water inrush disaster and its prevention measures are deeply studied by using the numerical analysis method in order to solve the deficiency and difficulty in the design of the karst tunnel water inrush disaster prevention. The main research results are as follows: (1) summing up and classifying the accidents of water inrush and mud inrush in karst tunnels at home and abroad, clarifying the great harm effect of water and mud inrush disaster to engineering, summarizing the present research situation of karst water inrush mechanism, This paper points out the scientific problems existing in the present research, and clarifies the purpose, contents and methods of the research. The characteristics of karst tunnel water inrush disaster and the influencing factors of karst tunnel water inrush disaster are analyzed. The relevant research is helpful to deepen people's understanding and understanding of karst tunnel water inrush disaster. (2) the karst tunnel rock plate is simplified as a structural mechanics model. When the cavities are located at the top, bottom and side of the tunnel respectively, the analytical expressions of the safe thickness of the rock plate are derived according to the bending and shear strength. The thickness of the rock plate obtained from the theoretical results is close to that of the safety thickness reserved in engineering practice. The results verify the rationality of the theoretical formula. (3) based on the FLAC3D numerical software, the concealed cavities are respectively located at the top of the tunnel. At the bottom and the side, the water pressure in the cavity is simplified to equivalent normal stress in the cavity. According to the water pressure and displacement growth curve, the critical water pressure can be determined, and the relationship between the water pressure and the safe thickness of the rock plate can be obtained. By comparing the numerical results with the theoretical results, it is found that the safe thickness of the rock plates obtained by the numerical results is slightly smaller than that of the theoretical results. But the safe thickness value is basically the same with the increase rate of water pressure. (4) combined with the relevant characteristics of Maoba syncline of Yuanliangshan Tunnel, the main methods of preventing and controlling the water inrush from the cavern in 2# are sorted out. In order to verify the influence of grouting on tunnel stability, the grouting effect was tested by FLAC3D, and the maximum shear stress, maximum principal stress and displacement were compared before and after grouting. The following conclusions are obtained: the maximum shear stress, the maximum principal stress and the maximum displacement of the surrounding rock around the tunnel after grouting have been reduced to a certain extent, which indicates that the overall strength of the surrounding rock after grouting is obviously enhanced. The ability of surrounding rock to resist the high water pressure of the cavity is obviously strengthened. (5) the monitoring data around the cavity around Yuanliangshan show that the compressive stress of the lining is obviously larger than that of the numerical simulation results. It shows that there are two possibilities: one is that the water pressure around the surrounding rock is more than 4 MPA, the other is that FLAC3D does not take into account the structural plane problem of the actual surrounding rock in the calculation process, and the parameters of the surrounding rock are better than those of the actual surrounding rock.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.11
【参考文献】
相关期刊论文 前10条
1 张朋;李晓红;卢义玉;康勇;周东平;;小导管注浆技术在浅埋富水岩溶隧道中的应用[J];地下空间与工程学报;2008年03期
2 李景新;;F_2’断层突水机理分析及其治理[J];北京工业职业技术学院学报;2009年03期
3 徐栋栋;邬爱清;孙玉杰;;某水电站引水隧洞突水数值模拟[J];长江科学院院报;2010年08期
4 黄辅强;王义海;司庆红;;济宁某井田矿井构造突水机理及防治措施[J];矿业安全与环保;2011年04期
5 黄明利;王飞;路威;谭忠盛;;隧道开挖诱发富水有压溶洞破裂突水过程数值模拟[J];中国工程科学;2009年12期
6 李围;;岩溶山区公路隧道施工突水的机理和模式分析[J];贵州大学学报(自然科学版);2009年06期
7 苏昌;陈海洋;周宁;关义涛;周建新;;平阳隧道岩溶突水类型与形成机理研究[J];资源环境与工程;2012年S1期
8 单长兵;刘元雪;寇佳;;某岩溶区既有公路隧道突水机理分析[J];后勤工程学院学报;2011年04期
9 李新新;郑继东;李智勇;马晓云;;冯营矿矿井突水机理分析[J];河南理工大学学报(自然科学版);2009年04期
10 张炜;李治国;王全胜;;岩溶隧道涌突水原因分析及治理技术探讨[J];隧道建设;2008年03期
相关博士学位论文 前1条
1 王遇国;岩溶隧道突水灾害与防治研究[D];中国铁道科学研究院;2010年
，本文编号：2246899
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2246899.html
