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在卵石覆盖区进行工程地质勘察主要有以下几种方法:地质钻探、折射波勘探、面波勘探和高密度电法。其中,地质钻探因为成孔难,所以勘探深度很有限;另外由于地震波在卵石覆盖区中的能量衰减非常快,因此折射波勘探和面波勘探效果也不佳。鉴于此,本文介绍了高密度电法原理,并从正演模拟出发,研究了高密度电法在卵石覆盖区进行工程勘察的可行性,并给出了两个应用实例。实践表明:高密度电法在勘察基岩面深度及起伏形态方面效果较好。
In the pebble area for engineering geological survey are the following methods: geological drilling, refraction wave exploration, surface wave exploration and high-density electrical method. Among them, geological drilling is difficult because of the hole, so the exploration depth is very limited. In addition, the seismic wave attenuation in the pebble area is very fast, so the refraction and surface wave exploration results are not good. In view of this, this paper introduces the principle of high-density electric method, and from the forward modeling, studies the feasibility of high-density electric method in engineering survey in the pebble area, and gives two application examples. Practice shows that high-density electrical method is better in prospecting depth and undulation of bedrock surface.