摘要
在评价济南市区地下泉脉对地铁建设影响的过程中,运用了地面瞬变电磁探测技术,根据视电阻率随深度变化规律,有效识别出地下地质结构分布特征,并将其划分为浅部高阻层,中部碎石、砂岩低阻含水层,深部基岩高阻层。其中,基岩埋藏呈现东部浅、西部深,南北浅、中部深的变化趋势;浅部地质结构则较为复杂,地层厚度分布不均匀,并存在断层导通深部含水层或溶洞的可能,地铁在此范围内施工时应做好预防。
During the process of exploring underground springs in Jinan city and evaluating its impact on metro con- struction, the transient electromagnetic method （TEM） is applied, which could effectively reduce the ambient noise and improve the inversion accuracy. According to the resistivity changes with depth, the underground geological struc- ture can be classified into three categories： the shallow highresistance layer, the middle stone/sandstone low-resistance aquifer, and the deep bedrock high-resistance layer. The bedrock is embedded deeper in the western and central areas of the city, while shallower in the eastern, northern and southern parts. However, the shallow geological structure is more complex, its stratigraphic thickness is unevenly dis- tributed, where the faults may be possibly connected to deep aquifers or karst caves. Therefore, the metro construction must take precautions against these risks.
出处
《城市轨道交通研究》
北大核心
2016年第8期43-47,共5页
Urban Mass Transit
基金
北京市教育委员会科技计划面上项目(PXM2010014225097947)
关键词
地铁建设
地下泉脉
地质勘察
瞬变电磁法
metro construction
underground springs
geological survey
transient electromagnetic method
