公路黄土暗穴探测扇形地震排列方法及其检测效果

The Application of Fan Array Eathquake Explore Method in Highway Loess Cave and its Detect Effect

本文针对公路工程中黄土暗穴的主要存在形式(多为暗穴空腔)和对探测深度的要求(30m以内),首次提出并运用多重扇形排列回折波与反射波地震测量方法,并在闫禹高速公路K173~K174路段北侧褚家塬已知I号洞穴群中的两个测试段实施了超浅层扇形排列地震波现场测量工作。实测资料表明,当暗穴空腔具有一定规模、且埋深不大时,扇形排列地震道集剖面中的回折波旅行时异常,可以作为公路工程黄土暗穴快速预探与精细定性评价的一个指示标志。并且,运用超浅层多重扇形地震排列观测方法,能够更有效地识别有关暗穴顶面反射、暗穴空腔边界绕射等地震波异常信息。

Direded against the main form of the loess caves in highway engineering,the paper introduces the application of multi fanarray comeback-wave and reflected-wave method in detecting two super shallow caves at Chujiayuan No.1 cave group at Yanyu Expres-sway K173～K174 section.The tested results show that the comeback-wave of the fan array becomes abnormal when the cave has a ce-rtain scale and shallow depth,which can be used as an signal of fast prediction.