摘要
针对隧道超前地质预报工作中岩溶问题的特殊性,运用瞬变电磁法探讨了溶洞、溶隙以及陷落柱等非层状体系的电阻率响应特征.现场试验表明,岩溶不发育的完整岩体质量较好,ρs值可达100～250 Ω;充满地下水的岩溶裂隙,其ρs值普遍低于背景值（5～10 Ω）,约0～5 Ω;而无水溶洞的ρs值则高于背景值,为15～20 Ω;陷落柱的ρs值异常不明显,需采用其他物探手段探测.结合七家营隧道工程对上述成果进行了验证,为我国南方岩溶隧道的超前预报方法和电磁地质解译提供了范例.
Transient electromagnetic method （TEM） was experimented in the Qijiaying tunnel project as an example to explore the resistivity response characteristics of non-layered systems including cave, karst fissure, collapse col- umns and so on, in view of the special nature of karst in tunnel geological prediction. Field tests show that the quality of a complete rock mass without karst development is better,and the value of ρs is up to 100--250Ω,;but the ρs value is generally lower than the background value of about 0 5 Ω, in karst fissures which is full of groundwater;the ρs value of anhydrous cave is above the background value for the 15 20 Ω;the subsided column is not obvious,so de- tection with other geopbysicai means is required. The research result helps with the forecasting methods of karst tun- nel in south China and electromagnetic geological interpretation.
出处
《山东科技大学学报（自然科学版）》
CAS
2014年第3期20-24,共5页
Journal of Shandong University of Science and Technology(Natural Science)
关键词
七家营隧道
超前地质预报
瞬变电磁法
岩溶探测
Qijiaying tunnel
geological prediction
transient electromagnetic method
karst detection
