摘要
本文论述了在大秦铁路某隧道勘察中应用浅层地震折射波法查明地下地质构造、风化带分层等情况的方法和手段;并根据资料解释成果、钻井资料和工区地质资料等,对在隧道开挖过程中可能遇到的断层及塌陷等情况进行了讨论;同时,对岩性的横向变化情况进行了初步讨论。
More and more attention has been paid to the method and skills of shallow seismic refraction, with the help of which many engineering and exploring problems can be solved.This method has been perfected in the recent engineering exploration. The refraction method of the first arrival used widely today has clear appearance and little disturbance.lt can be used to study layers of several metres,even hundreds of metres in depth.'With this method the location of layers can be determined more precisely and the more complex conditions on the surface of the earth can be observed.
The writers use the shallow seismic refraction of the first arrival to explore geology of tunnels in the Da-Qin railway engineering. In this paper we have discussed the method and skills in application of shallow seismic refraction, by which we found underground structures, weathering layers in exploring tunnels of the Da-Oin railway. Interpretating results are inferencely interpretated along with the geological surroundings of the construction region from the data. Compared with the data of borehole, the results are identical.And in the meantime, faults and subsidence that may be subjected during digging tunnels have been discussed. In addition,horizontal changes of rock characteristics have been preliminary studied. So, it is stated that the method of refraction seismic exploration is also applicable to horizontal differential layers.
