穿越滑坡段隧道衬砌受力分析及变形控制技术研究

发布时间：2018-01-16 01:02

本文关键词：穿越滑坡段隧道衬砌受力分析及变形控制技术研究　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：鉴于我国山区地形和地质条件的特殊性和复杂性,在这些地区修建公路或铁路时,不得不以隧道的形式穿过其中极有可能存在着滑坡等不良地质问题的地段,同时,已投入运营的穿山隧道也可能因边坡岩土体蠕滑等原因而演变成滑坡隧道。针对目前滑坡段隧道方面的研究现状,本文综合采用理论分析、数值模拟和现场实测等研究方法,在滑坡段隧道类型及变形破坏特征分析的基础上,对滑坡滑向与轴线正交条件下隧道衬砌受力及变形控制技术进行系统研究,取得了具有一定价值的研究成果,对类似工程的设计与施工具有一定的指导和借鉴意义,主要研究成果如下:⑴根据隧道与滑坡的相对位置关系,总结出4类穿越滑坡段隧道地质力学模型,并分析了各力学模型中隧道在滑坡推力与围岩压力作用下的受力变形特征,给出了对应情况下隧道的受力简图及变形特点,并对各类模型中衬砌裂缝成因进行了分析;最后分析了地形偏压荷载作用下隧道围岩压力的确定方法以及变形特征,为进一步研究滑坡地段隧道的受力变形机理和该类工程问题的防治提供一定的参考。⑵根据穿越滑坡段直墙拱形隧道衬砌与滑动面的位置关系,结合已有的滑坡相关理论,确定滑坡滑向与轴线正交条件下隧道衬砌上滑坡推力的分布形式和作用范围。基于结构力学方法,取半圆拱形隧道衬砌全拱结构作为研究对象,建立洞口段隧道衬砌结构力学模型,分析在滑坡体变形影响下隧道衬砌的受力状态,推导出了穿越滑坡段半圆拱形隧道衬砌内力的理论计算公式。⑶基于滑坡段隧道的受力变形机理和推导出的滑坡滑向与轴线正交条件下隧道衬砌内力理论计算公式,结合工程实例,对不同受力状态下的隧道衬砌内力分布进行了分析,并采用ANSYS有限元软件验证了该计算公式的正确性。在此基础上,对坡体与衬砌两类参数影响下的衬砌内力分布情况进行了分析,得出各参数影响下衬砌内力分布规律,为该类隧道衬砌的优化设计及采取针对性的综合整治措施提供一定的理论依据。⑷在对隧道和滑坡变形预加固技术及作用机理分析的基础上,结合唐家塬隧道进口段实际情况,采取综合整治措施,并通过现场监测,对该综合整治方案的效果进行了评价。监测结果表明,该方案能够确保隧道的后续施工安全高效进行,同时可有效降低隧道施工扰动对边坡稳定性产生的不利影响,而抗滑桩与隧道衬砌形成组合加固结构,能有效控制坡体的滑动,提高该类边坡的稳定性。
[Abstract]:In view of the particularity and complexity of terrain and geological conditions in mountainous areas of our country, when building roads or railways in these areas, we have to pass through the areas where there are some bad geological problems such as landslides and so on in the form of tunnels. At the same time, the tunnel that has been put into operation may also evolve into a landslide tunnel due to the creep of slope and soil. In view of the current research situation of the tunnel in the landslide section, this paper comprehensively adopts theoretical analysis. Based on the analysis of the tunnel types and deformation and failure characteristics of landslide section, the stress and deformation control technology of tunnel lining under the condition of sliding direction and axis are studied systematically by numerical simulation and field measurement. Some valuable research results have been obtained, which have certain guidance and reference significance for the design and construction of similar projects. The main research results are as follows: 1 according to the relative position relationship between tunnel and landslide. Four kinds of geological mechanics models of tunnel passing through landslide section are summarized, and the deformation characteristics of tunnel under the action of landslide thrust and surrounding rock pressure in each mechanical model are analyzed. The stress diagram and deformation characteristics of tunnel under corresponding conditions are given, and the causes of lining cracks in various models are analyzed. Finally, the determination method and deformation characteristics of surrounding rock pressure of tunnel under the action of topographic eccentric load are analyzed. In order to further study the deformation mechanism of the tunnel in landslide section and the prevention and cure of this kind of engineering problems, it provides a certain reference .2 according to the position relationship between the tunnel lining and sliding surface of the straight wall tunnel through the landslide section. Combined with the existing landslide theory, the distribution form and action range of landslide thrust on tunnel lining under the condition of landslide sliding direction and axis orthogonal are determined, based on structural mechanics method. Taking the semi-circular arch tunnel lining full arch structure as the research object, the mechanical model of tunnel lining structure is established, and the stress state of tunnel lining under the influence of landslide deformation is analyzed. The theoretical calculation formula of lining internal force of semi-circular arch tunnel through landslide section is derived. .3 based on the mechanism of stress and deformation of landslide section tunnel and the theoretical calculation of tunnel lining internal force under the condition of landslide sliding direction and axis orthogonality, the theory of tunnel lining internal force is deduced. Style. Combined with engineering examples, the internal force distribution of tunnel lining under different loading conditions is analyzed, and the correctness of the calculation formula is verified by using ANSYS finite element software. The distribution of lining internal force under the influence of slope and lining parameters is analyzed, and the law of lining internal force distribution under the influence of each parameter is obtained. For the optimal design of the tunnel lining and take targeted comprehensive regulation measures to provide a certain theoretical basis .4 on the basis of tunnel and landslide deformation pre-reinforcement technology and action mechanism analysis. Combined with the actual situation of the entrance section of Tangjiayuan tunnel, the comprehensive regulation measures are taken, and the effect of the comprehensive regulation scheme is evaluated through on-site monitoring. The monitoring results show that. This scheme can ensure the safe and efficient construction of the tunnel, at the same time can effectively reduce the adverse impact of tunnel construction disturbance on slope stability, and anti-slide pile and tunnel lining form a combined reinforcement structure. It can effectively control the sliding of slope body and improve the stability of this kind of slope.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.91

【相似文献】