抗滑桩在隧道—滑坡正交体系下的加固技术研究

发布时间：2018-04-16 23:07

本文选题：“隧道-滑坡”正交体系 + 机理　；参考：《中国铁道科学研究院》2014年硕士论文

【摘要】：隧道穿越不良地质地段时,滑坡病害常常是一个令工程师们头疼的问题,如果选线时不可避免的要穿越滑坡,加上人们现阶段对滑坡认识的局限性,往往在隧道开挖过程中或者隧道贯通后,隧道衬砌开裂变形、山体开裂蠕动,这时才发现隧道位于老滑坡不良地质体中,这就需要对病害进行治理。本文针对襄渝线K328+056-K328+579.2赵家塘隧道滑坡这一典型的“隧道-滑坡”正交体系工点为研究对象,通过地质调绘、力学计算、有限元数值模拟、地质力学模型试验等多种手段,对此工点的隧道与滑坡的相互作用机理、抗滑桩加固的机理、抗滑桩相关参数(如抗滑桩与隧道间距、抗滑桩的桩间距等)进行了较为深入的研究,主要研究内容如下： (1)对“隧道-滑坡”正交体系的类型进行了详细的论述,总结了滑坡地段隧道和滑坡的变形特征、引起隧道和滑坡变形的影响因素以及相应的5种地质力学模型。 (2)针对襄渝线K328+056-K328+579.2赵家塘隧道滑坡这一典型的“隧道-滑坡”正交体系工点,通过地质调绘从地质角度分析了老滑坡复活的原因和隧道变形破坏的原因,从而得出了其相互作用机理。对滑坡的推力进行了天然、暴雨、地震3种工况下的计算,再对隧道支挡前进行了内力计算,得出了隧道受到了明显的偏压作用,从隧道受力的角度分析了隧道变形破坏的原因。 (3)通过选用抗滑桩支挡和排水工程综合治理的方案,对天然工况下的隧道支挡前后进行了受力对比,得出了抗滑桩加固“隧道-滑坡”正交体系的加固机理,并且验证了埋入式抗滑桩对这种体系具有很好的加固效果。 (4)运用FLAC3D有限元分析软件对赵家塘滑坡隧道进行了5种工况的模拟分析,得出了合理的桩隧间距和抗滑桩的中-中间距。 (5)进行室内地质力学模型试验,由“隧道-滑坡”正交体系无支挡、抗滑桩支挡时抗滑桩中-中间距3.5倍桩径和5倍桩径3组模型试验,将坡体表面位移和隧道的内力图进行了对比分析,认为抗滑桩加固的效果显著,并且验证了数值模拟里面的结果。
[Abstract]:Tunnel adverse geological section, the landslide is often a headache to engineers, if it is inevitable to route through the coast, with people at the present stage of understanding of the limitations of the landslide, often in the process of tunnel excavation or tunnel lining cracks, deformation, mountain cracking peristalsis, then found that the tunnel is located in the old landslide of bad geological body, which is to govern the disease. According to the "tunnel landslide" Xiangfan Chongqing railway K328+056-K328+579.2 Zhao Jia Tang tunnel landslide is a typical system of orthogonal project as the research object, through geological mapping, mechanical calculation, finite element numerical simulation, geomechanical model test and other means in this regard, the interaction mechanism of tunnel and landslide sites, anti slide pile reinforcement mechanism, anti slide pile parameters (such as anti slide pile and tunnel spacing, anti slide pile spacing etc.) A more in-depth study is carried out, and the main contents are as follows:
(1) the types of "tunnel landslide" orthogonal system are discussed in detail, and the deformation characteristics of tunnel and landslide in landslide area are summarized, and the influencing factors of tunnel and landslide deformation and 5 corresponding geomechanical models are also summarized.
(2) for the "tunnel landslide" Xiangfan Chongqing railway K328+056-K328+579.2 Zhao Jia Tang tunnel landslide is a typical orthogonal system by geological mapping by reason of deformation and failure reasons and the old tunnel landslide is analyzed from the angle of geology, thus obtained the interaction mechanism. The landslide thrust is natural, rainstorm. Seismic calculation under 3 working conditions, the tunnel retaining before the internal force calculation, obtained by the obvious effect of bias tunnel from the tunnel, stress analysis of the damage cause of tunnel deformation.
(3) the anti sliding piles and drainage engineering comprehensive management program through selection of natural conditions of the tunnel retaining force before and after comparison, the reinforcement mechanism of "tunnel - anti slide pile landslide" orthogonal system, and verify the Embedded Pile to this system has good reinforcing effect the anti slide type.
(4) Zhao Jia Tang landslide tunnel were simulated and analyzed under 5 different conditions using finite element analysis software FLAC3D, the distance between tunnel and pile spacing of anti slide pile in.
(5) indoor geomechanical model test, the tunnel landslide orthogonal system without retaining piles of retaining piles in the middle - distance of 3.5 times the pile diameter and 5 times of the pile diameter of 3 groups of model tests, the internal force diagram of slope surface displacement and tunnel were analyzed. It is found that the anti slide pile effect, and verify the numerical simulation inside the results.

【学位授予单位】：中国铁道科学研究院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.3

【参考文献】