凝灰岩地区山岭隧道勘察物探解译技术探讨

Discussion on geophysical prospecting interpretation technique for tunnel survey in tuff area

物探技术是隧道勘察工作中重要的技术手段,通过获取连续的地下深部岩体地球物理特征差异,探测隧道洞身段断层破碎带、节理密集带、岩性变化带等不良地质体的埋深和规模。本文基于某油气管道工程多处越岭隧道勘察工作实践,对勘察发现的物探低阻异常带进行分析和地质解译,通过地质测绘与钻孔相互验证进行物探再解译,探讨凝灰岩地区越岭隧道勘察物探解译规律,为该地区类似隧道工程勘察物探解译工作提供参考。

Geophysical prospecting is an important technique in tunnel investigation.By obtaining continuous electrical differences in deep underground rock mass,it can detect the buried depth and the scale of harmful geological objects such as fault fracture zones,joint dense zones,and lithological change zones in the tunnel body.Based on the exploration practice of several tunnels in an oil and gas pipeline project,the geophysical low-resistivity abnormal zones discovered by exploration are analyzed and interpreted,and verified each other through surface investigation and drilling in the paper,the geophysical interpretation law of tunnel exploration in the tuff area is discussed.The discussion would provide reference for the geophysical interpretation of similar tunnel survey in this area.