大巴山隧道岩溶施工技术研究
发布时间：2018-08-27 07:28
【摘要】：在岩溶地区修建隧道工程的主要危害有:诱发工程灾害和人员伤亡;引起地面塌陷和地表沉降;造成水资源减少和枯竭;导致水质污染。本论文依托达陕高速公路大巴山隧道,重点研究大巴山隧道岩溶施工技术问题。按照岩溶大小、有无充填及是否在隧道中隐伏三个方面分析了岩溶隧道溶洞的处理措施,对富水性岩溶地段提出了开挖、排水处理措施,并根据数值计算分析了大巴山隧道岩溶段支护参数进行了结构计算,为顺利通过岩溶段提供理论和技术支撑。本文的主要研究进展和技术创新如下:(1)小型非隐伏岩溶处理措施如下:①对溶洞无充填或半充填型岩溶洞穴,应在清除溶洞表面浮土或洞穴内的充填后,采用先浇筑C15片石混凝土或M7. 5浆砌片石护墙,后墙背以干砌片石回填;②对于非隐伏性有充填型岩溶洞穴,应根据溶洞的所处位置及方便现场施工,采取相应的换填或加强防护措施,一般采用混凝土或水泥砂浆回填。(2)对于发育于隧道周边不同部位的大型溶洞,原则上应因地制宜,利用“梁、柱、墙、桩”等结构,采用“引、堵、越、绕”等措施进行处理。此时,需要根据溶洞有无充填选择恰当的方式,对洞体深且充填丰满、或难于回填、或不宜填塞的大型干溶洞,可依据现场条件选用型钢混凝土+板跨、托梁+板跨、钢管群桩、桩基+承台或回填的方法;对大型充填型溶洞应根据充填物的性质,选用钢管桩、旋喷桩、超前大管棚、注浆等措施。(3)对隐伏岩溶处理之前,应对情况进行详细勘察,然后根据隐伏岩溶的位置进行稳定性评价,对隧底充填溶洞应进行完整性及岩溶层受力计算,确定其加固的必要性及方法;对溶蚀破碎带,应根据其承载力及溶蚀充填物的流动性,确定是否需要采用注浆处理及处理控制深度。
[Abstract]:The main hazards of tunnel construction in karst areas are: inducing engineering disasters and casualties, causing ground subsidence and surface subsidence, reducing and drying up water resources, and leading to water pollution. Based on the Dabashan Tunnel of Da-Shan Expressway, this paper focuses on the karst construction technology of Dabashan Tunnel. According to the size of karst, whether there is filling or not and whether the karst tunnel is concealed in the tunnel, the treatment measures of karst tunnel are analyzed, and the excavation and drainage treatment measures are put forward for the water-rich karst area. The support parameters of karst section of Dabashan tunnel are calculated according to the numerical calculation, which provides theoretical and technical support for the smooth passage of karst section. The main research progress and technological innovations in this paper are as follows: (1) the small scale non-concealed karst treatment measures are as follows: (1) there is no filling or semi-filling karst cave on the karst cave, and it is necessary to remove the floating soil or filling in the cave surface. Cast C _ 15 flake concrete or M _ 7. (5) for the unconcealed filling karst cave, if the back of the wall is backfilled with dry flake stone on the back of the slurry flake stone protective wall, the corresponding replacement or strengthening protective measures should be taken according to the location of the karst cave and the convenient construction on the spot. Generally, concrete or cement mortar is used as backfill. (2) for large caverns developed in different parts around the tunnel, measures such as "beam, column, wall, pile" and "lead, block, overrun, around" structure should be adopted in principle according to local conditions. At this time, according to whether the cavern is filled or not, the appropriate way should be chosen, and for large dry caverns with deep and full cavity body, or difficult to backfill, or not to be filled, the section steel concrete slab span and the bracket slab span may be selected according to the site conditions. The method of steel pipe group pile, pile foundation cap or backfill; according to the nature of filling material, steel pipe pile, rotary jet pile, leading pipe shed, grouting and so on should be selected for large filling cave. (3) before the treatment of concealed karst, The detailed investigation should be carried out, and then the stability evaluation should be carried out according to the location of the concealed karst, and the integrity and the stress of karst layer should be calculated to determine the necessity and method of reinforcement. According to the bearing capacity and the fluidity of the solution filling, it is necessary to use grouting treatment and control depth.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.49
本文编号：2206549
[Abstract]:The main hazards of tunnel construction in karst areas are: inducing engineering disasters and casualties, causing ground subsidence and surface subsidence, reducing and drying up water resources, and leading to water pollution. Based on the Dabashan Tunnel of Da-Shan Expressway, this paper focuses on the karst construction technology of Dabashan Tunnel. According to the size of karst, whether there is filling or not and whether the karst tunnel is concealed in the tunnel, the treatment measures of karst tunnel are analyzed, and the excavation and drainage treatment measures are put forward for the water-rich karst area. The support parameters of karst section of Dabashan tunnel are calculated according to the numerical calculation, which provides theoretical and technical support for the smooth passage of karst section. The main research progress and technological innovations in this paper are as follows: (1) the small scale non-concealed karst treatment measures are as follows: (1) there is no filling or semi-filling karst cave on the karst cave, and it is necessary to remove the floating soil or filling in the cave surface. Cast C _ 15 flake concrete or M _ 7. (5) for the unconcealed filling karst cave, if the back of the wall is backfilled with dry flake stone on the back of the slurry flake stone protective wall, the corresponding replacement or strengthening protective measures should be taken according to the location of the karst cave and the convenient construction on the spot. Generally, concrete or cement mortar is used as backfill. (2) for large caverns developed in different parts around the tunnel, measures such as "beam, column, wall, pile" and "lead, block, overrun, around" structure should be adopted in principle according to local conditions. At this time, according to whether the cavern is filled or not, the appropriate way should be chosen, and for large dry caverns with deep and full cavity body, or difficult to backfill, or not to be filled, the section steel concrete slab span and the bracket slab span may be selected according to the site conditions. The method of steel pipe group pile, pile foundation cap or backfill; according to the nature of filling material, steel pipe pile, rotary jet pile, leading pipe shed, grouting and so on should be selected for large filling cave. (3) before the treatment of concealed karst, The detailed investigation should be carried out, and then the stability evaluation should be carried out according to the location of the concealed karst, and the integrity and the stress of karst layer should be calculated to determine the necessity and method of reinforcement. According to the bearing capacity and the fluidity of the solution filling, it is necessary to use grouting treatment and control depth.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.49
【参考文献】
相关期刊论文 前3条
1 蒋忠信;隧道工程与水环境的相互作用[J];岩石力学与工程学报;2005年01期
2 姜清辉,丰定祥;三维非连续变形分析方法中的锚杆模拟[J];岩土力学;2001年02期
3 光耀华;岩溶地区工程地质研究[J];红水河;1998年02期
相关博士学位论文 前1条
1 张志龙;越岭长大公路隧道地质预报中的关键技术问题研究[D];成都理工大学;2006年
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