挤压破碎带围岩大变形与施工控制技术研究

发布时间：2018-05-04 03:06

本文选题：挤压破碎围岩 + 注浆试验　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：在隧道修建过程中,高地应力挤压破碎带围岩大变形易导致侵限、钢拱架凸出、初衬混凝土剥落、甚至塌方等灾害,已经成为当前亟需解决处理的重点和难点。由于导致隧道产生围岩大变形的原因很多,其机理也各不相同,工程控制措施必须具有针对性。为有效的减小和防止隧道大变形灾害的发生,本文以十天高速略阳连接线象山隧道为工程依托,采用理论分析、现场调查、现场试验以及数值模拟的方法,研究总结了高地应力隧道围岩大变形产生的机理及控制技术,主要的研究成果如下:(1)调查分析了隧道大变形区域的水文地质及现场施工情况,在大变形段初衬混凝土剥落、钢拱架弯曲变形等问题较为突出。利用现代量测技术对隧道进行变形及内力监测,通过分析得到了拱顶沉降、水平收敛、初衬与围岩间内力以及初衬与二衬间内力都有着明显的时空效应。(2)以现场隧道施工工况为依据,利用FLAC3D软件,建立数值模型,并通过与现场监测数据对比分析,验证了模型的合理性。重点分析了埋深及围岩级别两种因素对围岩产生大变形的影响。(3)利用仿真模型试验模拟现场围岩注浆,对注浆效果进行评价,得出现场单液注浆和双液注浆较为合理的水灰比及配比。并数值模拟分析了不同施工工艺对于围岩变形的影响,得出了二衬较为合理的施做时机、开挖台阶及循环进尺长度。进而对现场隧道施工下的大变形控制起到了一定的指导意义。
[Abstract]:In the process of tunnel construction, large deformation of surrounding rock in high ground stress crushing zone will easily lead to invasion, steel arch frame protruding, initial lining concrete spalling, and even collapse and so on, which has become the focus and difficulty to solve at present. Since there are many reasons for the large deformation of surrounding rock in the tunnel, the mechanism of the tunnel is different, so the engineering control measures must be targeted. In order to effectively reduce and prevent the occurrence of the large deformation disaster of the tunnel, this paper takes the Xiangshan tunnel, a 10-day high-speed Luoyang connecting line, as the engineering support, and adopts the methods of theoretical analysis, field investigation, field test and numerical simulation. The mechanism and control technology of large deformation of surrounding rock of tunnel with high in-situ stress are studied and summarized. The main research results are as follows: 1) the hydrogeology and site construction in large deformation area of tunnel are investigated and analyzed, and the initial lining concrete peeling off in large deformation section. Steel arch frame bending deformation and other problems are more prominent. The deformation and internal force of the tunnel are monitored by the modern measurement technology. Through the analysis, the settlement of the vault is obtained, and the horizontal convergence is obtained. The internal force between the initial lining and the surrounding rock and the internal force between the initial lining and the second liner have obvious space-time effect. Based on the working conditions of the field tunnel construction, the numerical model is established by using FLAC3D software, and the numerical model is compared with the field monitoring data. The rationality of the model is verified. The influence of two factors, the depth of burying and the grade of surrounding rock, on the large deformation of surrounding rock is analyzed emphatically. The grouting effect of surrounding rock is evaluated by simulation model test. The reasonable water cement ratio and ratio of single and double liquid grouting are obtained. The influence of different construction technology on the deformation of surrounding rock is analyzed numerically, and the reasonable timing of the second lining, the excavation step and the length of the circular ruler are obtained. Furthermore, it plays a guiding role in the control of large deformation in the field tunnel construction.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49

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