摘要
城市轨道交通一般处于城市中心,对于勘察钻孔和布设大范围的微动台阵有很多的不便和限制。本文提出利用微动技术的线性台阵,沿城市道路方向布设检波器,减少了占地范围,为道路地下地质分层提供了丰富的频散曲线信息。研究表明,线性台阵利用多通道采集技术,获得多个勘探点的数据,通过频散曲线的拐点、斜率和频散点疏密进行分层,与已知钻孔资料对比后,确定了方法的可靠性。本文以南京某在建地铁为例,结合附近运营线路钻孔资料和微动技术勘测资料,为在建补充地质勘察工作提供了依据,相比钻孔成果微动技术更能揭露地下复杂地层的分布,提高了工程地质勘察精度和效率,缩减了勘察成本和工期。
Urban rail transit is generally located in the city center,which has many inconveniences and limitations for the survey of drilling holes and the deployment of a large range of micro-motion array.This paper proposes to use linear arrays of microtremor ultrasound technique to deploy detectors along the city roads,reducing the land occupation and providing rich dispersion curve information for the underground geologic layering.The study shows that the linear array uses multi-channel acquisition technology to obtain data from multiple exploration points,and the layering is determined by the turning points and density of the dispersion curve.After comparison with known borehole data,the reliability of the method is determined.A case study of Nanjing subway under construction is performed with the combination of the borehole data of lines in operation and the microtremor ultrasound technology exploration data,the geological exploration of under construction is supplemented,and the distribution of complex underground strata is revealed more accurately,which improves the accuracy and efficiency of engineering geological exploration,and reduces exploration costs and time.
作者
侯智超
柴新朝
方成
程建闯
Hou Zhichao;Chai Xinchao;Fang Cheng;Cheng Jianchuang(Beijing Urban Construction Exploration and Surveying Design Research Institute Co.,Ltd.,Beijing 100101,China)
出处
《工程勘察》
2024年第6期65-71,共7页
Geotechnical Investigation & Surveying
关键词
勘察钻孔
微动技术
线性台阵
地质分层
频散曲线
exploration borehole
microtremor ultrasound technology
linear array
geologic layering
dispersion curve
