深层地震勘探在深埋特长隧道勘察中的应用

Application of Deep Earthquake Exploration to the Investigation of Deep and Long Tunnel

以沪蓉国道主干线湖北省高坪-吉心段大水井隧道的工程地质勘察为例,讨论了深层地震勘探在深埋特长隧道勘察中的应用。利用深层地震反射波法可以有效地探测覆盖层、各风化层以及不同基岩界面的埋藏深度,根据波速判断隧道围岩类别、探测不良地质现象(喀斯特、断层、节理裂隙等)等。因此,深层地震勘探可为隧道的设计、施工提供必要的地质依据。

In this paper, based on a case study of the engineering geological investigation in Gaoping-Jixin tunnel in Hu-Rong national highway, Hubei Province, the earthquake exploring method, which applies to the deep-imbedded long tunnels, is concretely discussed. In the deep-imbedded long tunnel engineering geological investigation, the embedding depth of the mantlerock and rock interfaces can be explored effectively with deep earthquake reflect wave method. According to the wave speed, the wall rock sort can be identified and ill geological phenomena, such as karst, fault, joints and fissures and so on, can be explored.This can provide geological foundations for the design and construction of the tunnels. By comparison with other ways of engineering geological investigation,for example,engineering geological drilling,trench and electric prospecting,the deep earthquake exploration is not only simple and convenient,but also has reasonable outcome.The case indicates that the deep earthquake is a better way of exploring.