引水隧洞不同结构段缺陷分布特征与受力机理
DOI:
作者:
作者单位:

1.西南科技大学土木工程与建筑学院;2.清华四川能源互联网研究院;3.西华大学应急管理学院

作者简介:

通讯作者:

中图分类号:

TV672

基金项目:

国家自然科学基金(U21A20157);四川省科技计划资助项目(2022YFSY0011,2023YFS0410)


Distribution characteristics and mechanical mechanism of defects in different structural sections of diversion tunnels
Author:
Affiliation:

Southwest University of Science and Technology

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    [ ]引水隧洞水平段与斜井段在不同受力条件下衬砌表观缺陷特征差异较大,针对隧洞不同结构段应力特征影响缺陷分布的问题,采用智能机器人搭载三维激光扫描仪对隧洞表观缺陷进行数据采集。基于不同结构段巡检数据的特征与规律,研究隧洞上平段与斜井段产生缺陷的受力机理,并利用有限元软件建立隧洞三维模型,分析上平段与斜井段的应力变形特征。结果表明:引水隧洞上平段存在的缺陷数量明显多于斜井段,缺陷主要分布在拱顶部位;当围岩测压力系数<1/3,上平段衬砌结构顶部出现应力大于拱腰与拱底,而斜井段由于倾斜角度引起围岩压力分量的产生,其斜井壁面的应力小于上平段;通过数值模拟可知隧洞顶部沉降明显,且上平段受围岩扰动产生压力差的变化更大,这与巡检结果机理分析的吻合度较好。

    Abstract:

    The characteristics of apparent defects in lining of horizontal section and inclined section of diversion tunnel are quite different under different stress conditions. Aiming at the problem that stress characteristics of different structural sections of tunnel affect the distribution of defects, an intelligent robot equipped with 3D laser scanner is used to collect data on apparent defects of tunnel. Based on the characteristics and rules of the inspection data of different structural sections, the mechanical mechanism of the defects in the upper flat section and the inclined section of the tunnel is studied, and the three-dimensional model of the tunnel is established by finite element software to analyze the stress and deformation characteristics of the upper flat section and the inclined section. The results show that the number of defects in the upper horizontal section of the diversion tunnel is obviously more than that in the inclined section, and the defects are mainly distributed in the vault. When the measured pressure coefficient of the surrounding rock is less than 1/3, the stress on the top of the lining structure in the upper flat section is greater than that on the waist and bottom of the arch, while the stress on the wall of the inclined section is smaller than that of the upper flat section due to the pressure component of the surrounding rock caused by the inclination Angle. The numerical simulation shows that the settlement at the top of the tunnel is obvious, and the pressure difference in the upper flat section caused by the disturbance of the surrounding rock is greater, which is in good agreement with the mechanism analysis of the inspection results. Keywords:diversion tunnel;inclined shaft section;apparent defect;mechanical mechanism

    参考文献
    相似文献
    引证文献
引用本文

杨立一,王皓冉,谢辉,等. 引水隧洞不同结构段缺陷分布特征与受力机理[J]. 科学技术与工程, , ():

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2023-10-23
  • 最后修改日期:2024-05-17
  • 录用日期:2024-05-21
  • 在线发布日期:
  • 出版日期:
×
亟待确认版面费归属稿件,敬请作者关注