雩山隧道断层破碎带稳定性分析及治理方法

发布时间：2019-04-20 08:47

【摘要】：隧道施工时经常遇到断层破碎带等复杂地质问题,严重的可能造成重大人员和经济损失。本文结合雩山隧道的现场施工,开展了隧道穿越断层破碎带超前预报、稳定性分析、监控量测与处理措施的研究。分析成果为隧道穿越断层破碎带施工安全提供了技术指导,为类似工程提供了理论依据和工程经验,具有较实用的工程价值。本文主要研究成果如下：(1)对隧道掌子面前方的断层破碎带开展了综合超前地质预报,有效探明了断层破碎带发育的位置与规模,并且发现隧道前方围岩破碎,存在软弱夹层或含水,围岩稳定性较差。(2)管棚施工、超前小导管及超前锚杆在隧道穿越的断层破碎带治理中是十分有效的,通过合理的设计和精细的施工,对雩山隧道穿越的断层破碎带进行了处理,监测结果证明,管棚施工、超前小导管及超前锚杆在雩山隧道工程中的应用,完全满足设计要求。(3)对雩山隧道穿越断层破碎带段进行数值模拟,计算结果表明隧道横向应力主要集中于隧道两侧的边墙,方向朝向隧道内侧,使得隧道边墙向内侧挤压,产生朝向内侧的位移；隧道竖向应力主要集中于隧道拱顶和底板,方向朝向隧道内侧,使得隧道拱顶产生下沉,底板隆起。施工时应加强对这些部位的支护。(4)对雩山隧道穿越断层破碎带段进行周边收敛和拱顶下沉的监测,没有出现较大的变形。与计算结果相对比发现,数值计算结果能够近似的反映工程实际结果,但由于现场复杂的地质条件,相关参数的简化选取以及隧道模型不可能真正与实际隧道相同,模拟结果相对实际监测结果有一定的偏差。但数值计算得到的隧道周边位移变化趋势与监控量测结果接近,可以为修改断层破碎带处理方案提供一定的参考。
[Abstract]:During tunnel construction, complex geological problems such as fault rupture zone are often encountered, which may cause serious personnel and economic losses. In this paper, based on the site construction of Yushan tunnel, the advance prediction, stability analysis, monitoring measurement and treatment measures of tunnel crossing fault fracture zone have been carried out. The analysis results provide technical guidance for construction safety of tunnel crossing fault broken zone, provide theoretical basis and engineering experience for similar projects, and have practical engineering value. The main research results of this paper are as follows: (1) Comprehensive advance geological prediction is carried out on the fault fracture zone in front of the tunnel palm surface, and the location and scale of the fault fracture zone are proved effectively, and the surrounding rock in front of the tunnel is found to be broken. There is weak interlayer or water cut, and the stability of surrounding rock is poor. (2) the construction of pipe shed, the leading small pipe and the leading anchor rod are very effective in the treatment of the fracture zone through the tunnel, through reasonable design and fine construction, The fault fracture zone through Yushan tunnel is dealt with. The monitoring results show that the application of pipe shed construction, leading small pipe and lead anchor rod in Yushan tunnel project. The results show that the lateral stress of Yushan tunnel is mainly concentrated on the side walls on both sides of the tunnel, and the direction is toward the inner side of the tunnel, and the numerical simulation results show that the transverse stress of Yushan tunnel is mainly concentrated on the side walls on both sides of the tunnel. The side wall of the tunnel is extruded to the inside to produce the displacement toward the inside of the tunnel. The vertical stress of the tunnel is mainly concentrated on the roof and floor of the tunnel, facing the inner side of the tunnel, which leads to the settlement of the arch roof and the uplift of the bottom plate. During construction, the support of these parts should be strengthened. (4) the surrounding convergence and arch subsidence of Yushan tunnel crossing the fault fracture zone are monitored, and there is no large deformation. Compared with the calculated results, it is found that the numerical results can approximately reflect the actual engineering results, but due to the complex geological conditions in the field, the simplified selection of the relevant parameters and the tunnel model cannot really be the same as the actual tunnel. The simulation results have some deviation from the actual monitoring results. However, the variation trend of displacement around the tunnel obtained by numerical calculation is close to the result of monitoring and measurement, which can be used as a reference for modifying the treatment scheme of fault fracture zone.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.11;U455

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