摘要
近年我国城市发展迅速,城市轨道交通的建设也随之蓬勃发展起来。为了提高施工的效率,缩短施工周期,往往采用盾构法进行施工,同时由于城市地下地质环境复杂,经常性地存在地面塌陷或者孤石,对于城轨建设造成不可估量的影响。地下空洞和孤石等地质隐患需要依靠地球物理场的探测技术,快速定位和发现位置。针对单一地球物理场的作用限制,本文提出一种多地球物理场的探测手段,可以基本满足城轨建设中浅层地表的探测精度要求。主要将地面浅层地震、直流电法等粗略勘探手段与视电阻率跨孔CT或地震波跨孔CT相结合,构建出快速的诊断分析系统。该系统的诊断方法是通过对土洞塌陷的地震波跨孔CT和电阻率跨孔CT进行三维数值模拟。此诊断方法极大地提高了施工现场的工作效率,成为我国城轨建设中探查地质隐患的重要技术手段。
In recent years,China has a rapid growth on urbanization,and the construction of urban rail transit has developed vigorously.In order to improve the construction efficiency and shorten the construction period,shield method is often used for construction.At the same time,due to the complex urban underground geological environment,ground collapse or boulders often exist,which has an inestimable impact on urban rail construction.Geological hazards such as underground cavities and boulders could be located quickly by detection technology of geophysical field.Considering the limitation of single geophysical field,this paper proposes a detection method of multi geophysical field,which can basically meet the requirements of detection accuracy in shallow surface during urban rail construction.This method mainly combines the rough exploration methods such as ground shallow seismic and DC method with apparent resistivity cross hole CT or seismic wave cross hole CT to build a fast diagnosis and analysis system.The diagnosis method of the system is through three-dimensional numerical simulation of seismic wave cross hole CT and resistivity cross hole CT of soil cave collapse.This diagnosis method greatly improves the work efficiency of the construction site and has became an important technical means to explore hidden geological dangers in urban rail construction in China.
作者
王小安
WANG Xiao’an(Shaanxi Railway Engineering Survey Co.,Ltd.,China Railway FirstSurvey and Design Institute,Xi’an 710000,Shaanxi,China)
出处
《矿产勘查》
2022年第6期819-824,共6页
Mineral Exploration
关键词
城轨交通
地质隐患
孤石
诊断技术
多地球物理场
urban rail transit
geological hazards
boulder
diagnostic technology
multi geophysical field
