TBM施工过程中直流电阻率法地质前探的正演研究

发布时间：2018-01-13 22:36

本文关键词：TBM施工过程中直流电阻率法地质前探的正演研究　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国现代化建设快速发展,在交通、水利水电、矿山等领域中对隧道工程的修建需求量日益增加。然而,在隧道施工过程中,由于地下水文地质条件十分复杂,极易发生突水等地质灾害。因此,施工安全的保证成为隧道工程中亟待解决的重大工程难题。针对上述问题,本文根据BEAM(Bore-tunneling Electrical Ahead Monitoring)技术中的扫描模式,采用有限单元法对TBM(Tunnel Boring Machine)施工过程中遇到的一些异常地质情况进行正演计算。本文主要研究工作:首先,为了判断掌子面前方是否存在异常地质体,采用BEAM技术中扫描模式的单电极方式,根据视电阻率变化百分比曲线的趋势,判断异常地质体是否存在。其次,为了判别异常地质体位于掌子面正前方还是旁侧,通过比较两者视电阻率变化百分比曲线之间的差异,达到判断异常地质体位于正前方还是旁侧的目的。最后,为进一步解决旁侧异物干扰的问题,采用BEAM技术中扫描模式,选取多个刀头作为主电极,刀盘的旋转带动刀头旋转,扫描整个刀盘平面,通过建立伪色彩图和分析其异常特性,判断异常地质体的空间位置。结果表明:当异常地质体距离刀盘较远的时候,采用BEAM技术中扫描模式的单电极方式,通过视电阻率变化百分比曲线判断出异常地质体的存在;当异常地质体距离刀盘较近的时候,采用BEAM技术中的扫描模式,通过观测伪色彩图确定异物与刀盘中心轴线之间的位置关系。
[Abstract]:With the rapid development and modernization of our country in transportation, water conservancy and hydropower, mining and other fields in the construction demand of tunnel engineering is increasing. However, in the tunnel construction process, due to the underground hydrogeological condition is very complex, prone to geological disasters such as water inrush. Therefore, the construction safety has become a major problem to ensure the engineering to solve the tunnel engineering. Aiming at the above problems, according to the BEAM (Bore-tunneling Electrical Ahead Monitoring) technique in scanning mode, the TBM using the finite element method (Tunnel Boring Machine) the construction of some abnormal geological conditions encountered in the process of forward calculation. The main research work of this paper: firstly, in order to determine whether in front of the face abnormal geological body, using a single electrode scanning mode in BEAM technology, according to the percentage changes in apparent resistivity curve trend, abnormal geological body Whether or not exist. Secondly, in order to distinguish abnormal geological body in front of the face or side, by comparing the differences between the apparent resistivity change percentage curve, to determine the abnormal geological body is located in front of or beside the purpose. Finally, in order to further solve the problem of lateral foreign interference, using the scanning mode of BEAM technology, choose more than one the cutter head is used as the main electrode, the cutter rotation drives the cutter head to rotate, the scanning plane of the cutter head, through the establishment and analysis of the abnormal characteristics of pseudo color map, determine the spatial position abnormal geological body. The results show that when the abnormal geological body cutter distance is far, the single electrode scanning mode of BEAM technology the apparent resistivity curve by the percentage changes in determining the abnormal geological body; when the abnormal geological body distance closer to the cutter, the scanning mode by BEAM technology. To determine the observed pseudo color map the relationship between the position of foreign body and the cutter central axis.

【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.11

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