浅层地震反射波法在某大型工程场址工程地质勘察中的应用

The Application of Shallow Seismic Reflection Wave Method to Engineering Geological Investigation in One Large Engineering Site

浅层地震反射波法是工程地质勘察中隐伏断裂探测的重要物探手段。为了查明某大型工程场址区内隐伏断裂分布特征,在近场地质资料分析的基础上,针对覆盖层厚度薄、断裂构造复杂等技术难点,采用了横波反射法对场区隐伏断裂进行探测。分别从野外数据采集、资料处理及探测成果解释等方面进行了详细介绍,准确查明了场址区隐伏断裂的位置、埋深及其展布形态等特征,并用钻孔验证了结果的可靠性。结果表明,横波反射法在薄覆盖层、复杂构造地区的隐伏断裂探测中能够取得良好的应用效果,为今后类似地区开展隐伏断裂探测提供重要技术参考。

Shallow seismic reflection wave method is one of the important geophysical explo- ration methods of concealed fault detection in engineering geology investigation. In order to find out the distribution features of concealed faults in a large project site, the SH-wave re- flection method was used in detecting the concealed faults in this paper, based on the analy- sis of geological data in near-site and focused on many technique problems, such as the thin sediment and complicated geological structure and so on. The key technique points were in- troduced in detail, such as data acquisition, data processing and profile interpretation and so on, and the location, buried depth and distribution characteristics of concealed faults were investigated precisely and the reliability of the results was tested by drills. The result shows that it has achieved good application effect in thin sediment and complicated geological structure by SH-wave reflection. This method and technique will provide an important technical reference for detection of concealed fault in this region and the other area with similar geological conditions.