摘要
随着城市空间逐步向地下发展,地下岩溶等不良地质体的存在给城市建设带来较大的安全隐患,常规的地球物理探测方法在城市地下岩溶等不良地质体探测中因人文活动、电磁干扰等因素的影响而受到极大限制.微动探测作为一种被动源勘探方法,因其场地适应能力强、工作效率高等优点被逐渐应用于城市地下岩溶探测.基于微动的HVSR谱比法则具有更好的适应性.为探索该方法在城市岩溶探测的有效性及其特征,选取岩土勘察中的两个工程场地作为探测试验区.试验区内岩溶发育,通过钻探获取了岩溶的空间分布特征及基岩的起伏变化.在试验区的岩溶异常上进行HVSR测试,并利用面波勘探的频散曲线对HVSR谱比曲线进行深度换算,从而代替钻孔信息进行深度换算的方法,来探测地下地质情况.结果表明,利用该方法进行HVSR谱比曲线的深度换算简便有效,能有效的探测出地下岩土分界面和岩溶的分布情况,为后续岩溶区工程勘察提供帮助,减少钻探工程量提高经济效益和时间效率.
With the gradual development of urban space underground,the existence of underground karst and other unfavorable geological bodies brings great safety hidden danger to urban construction,The conventional geophysical exploration methods are greatly restricted in the exploration of unfavorable geological bodies such as urban underground karst due to the influence of human activities and electromagnetic interference.As a passive source exploration method,micromotion survey has been gradually applied to urban underground karst exploration because of its strong adaptability and high efficiency.The spectral ratio of HVSR based on fretting has better adaptability.In order to explore the effectiveness and characteristics of this method in urban karst detection,two engineering sites in geotechnical investigation are selected as detection test areas.Karst is developed in the test area,and the spatial distribution characteristics of karst and the fluctuation changes of bedrock are obtained through drilling.HVSR was tested on karst anomalies in the test area,and the depth conversion of HVSR spectral ratio curve is carried out by using the dispersion curve of surface wave exploration,so as to detect the underground geological conditions instead of the method of depth conversion from drilling information.The results show that this method is simple and effective in depth conversion of HVSR spectral ratio curve,and can effectively detect the distribution of underground rock and soil interface and karst,provide help for subsequent engineering investigation in karst area,reduce the amount of drilling and improve economic benefit and time efficiency.
作者
沈志平
陈发达
张虎
王祥
刘欢
SHEN ZhiPing;CHEN FaDa;ZHANG Hu;WANG Xiang;LIU Huan(Guizhou Zhengye Engineering and Technology Investment Co.,Ltd.,Guiyang 550012,China;Guiyang Urban Rail Transit Group Co.,Ltd.,Guiyang 550081,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第4期1757-1763,共7页
Progress in Geophysics
基金
中央引导地方科技发展资金项目(黔科中引地[2021]4001)
贵州省科研机构创新能力建设专项资金项目(黔科合服企[2019]4003)联合资助。
关键词
HVSR
面波
微动
岩溶
HVSR
Surface wave
Micromotion
Karst
