浅层断层探测技术及工程应用

浅层断层探测是工程场地地震安全性评价的现场工作内容之一,其主要目的是查明地表附近断层的空间展布特征和最新活动时代,为地震危险性评价、工程避让或采取抗断措施等提供依据。浅层断层探测常用的方法有浅层地震反射波法、浅层地震折射波法、探地雷达法、高密度电法、地球化学法等。结合各探测方法的原理,分析了各探测方法在适用介质条件、探测深度、探测分辨率等方面的特点,进行了实际工程应用验证。根据各探测方法的特点,给出了不同场地类型条件下的浅层断层探测的优选方法及方法组合方案;并在实际工作中取得了良好的应用效果。

Shallow Faults Exploration Technology and Its Engineering Application

Shallow faults exploration is a part of field work of seismic safety assessment of engineering site, and the main purpose is to find out the spatially distributing feature and the latest active age of faults near the surface and to provide the basis of seismic risk evaluation, engineering preventing collision and taking anti-rapture measures. Commonly used methods of shallow faults exploration concludes shallow seismic reflection wave method, shallow seismic refraction wave method, ground penetrating radar method, high-density electrical method, geochemical method, etc. Combined with the principles, characteristics of each exploration were analyzed in this article, concluding application medium conditions, investigation depth, detecting resolution, etc. According to the characteristics of each exploration method, the optimizing method and combination scheme of shallow faults exploration in different site-types were given,and achieved good application effect in practical work.