Analysis of Near-surface Strata Structure in the Thick-covered Coastal Zone of Northern Jiaodong——Detection Results Based on High-density Electrical Method and Ground Penetrating Radar Method
As few surface geological outcrops are detected in the coastal zone of north Jia-odong,geological phenomena such as rock mass,strata and structure are difficult to directly observe through surface outcrops.In order to find out the distribution of shallow strata in the coastal zone around study area and evaluate the suitability of urban underground space development,high density resistivity method and ground penetrating radar method are used to carry out near surface geological survey.Through investigation,the shallow strata lithol-ogy,the buried depth of each lithology layer at the top and bottom interface and its variation rule in the coastal zone covering study area are preliminarily identified.On the east side of study area,the average buried depth at the bottom of the fine sand layer is 23 m,and the av-erage buried depth at the top of the granite layer is 37 m.On the west side of study area,the buried depth of silt layer bottom is 2～2.5 m,the buried depth of fine sand layer bottom in-terface is 24 m on average,and the buried depth of granite top interface is 35 m on average.The thickness of the sedimentary layer gradually thinned from sea to land,and the buried depth of the top interface of the granite bedrock gradually shallower from sea to land.The interface depth of each lithologic layer detected by the high-density resistivity method and ground penetrating radar method is consistent with the borehole data,which provides geo-physical basis for the shallow strata distribution study in the coastal zone around study area and evaluating the suitability of urban underground space development.
high density resistivity methodground penetrating radarthick cover areacoastal zonecomprehensive geological survey
NETL
NSTL
万方数据
