摘要
怀宁县月山镇附近为岩溶发育区,岩溶塌陷产生塌坑百余个,严重影响城市安全,因此探明该区地下地质情况尤为重要。以往在该区开展了高密度电法、瞬变电磁法和钻探工作,初步掌握了岩溶发育位置及特征。本次研究在前期工作基础上开展微动勘探剖面,通过频率-波数法从微动信号中提取面波,反演绘制速度-深度剖面图,分析剖面图并推测岩溶发育区范围及形态,研究微动方法在城区岩溶勘探中的应用效果。结果表明:微动勘探对地下岩溶有很好的反映,对已填充的溶洞也有明显异常表现;从微动速度-深度剖面上能够快速提取高、低速异常体的特征信息,对地质体进行分层及构造识别方面也有很好的效果。
The vicinity of Yueshan town in Huaining county is a karst development area.There are more than a hundred karst collapses,which seriously affect the safety of the city.Therefore,it is particularly important to find out the underground geological conditions of this area.Some explorations using high-density electrical methods or transient electromagnetic methods were carried out in this area to roughly grasp the location and characteristics of karst development.Based on the previous research,by frequency-wavenumber method,this paper carries out fretting exploration profiles,extracts surface waves from microtremor signals,inverts and draws velocity-depth profiles,analyzes profiles and infers the range and morphology of karst development areas,and studies fretting to testify the application effect of the method in urban karst exploration.The results show that:the microtremor exploration has a good reflection on the underground karst,and has obvious abnormal performance for the filled karst cave;the characteristic information of high and low velocity abnormal bodies can be quickly extracted from the fretting velocity depth profile,and the geological body stratification and structural identification are also very effective.
作者
范长丽
贾慧涛
蔡向阳
Fan Changli;Jia Huitao;Cai Xiangyang(Anhui Institute of Geophysical and Geochemical Exploration Technology, Hefei Anhui 230022, China)
出处
《工程地球物理学报》
2020年第5期652-657,共6页
Chinese Journal of Engineering Geophysics
关键词
微动勘探
城区岩溶
频率-波数法
microtremor exploration
urban karst
frequency-wavenumber method
