探地雷达在探测基岩顶深度中的应用

The application of GPR in detecting the depth of bedrock

为了配合东天山—北山地区化探工作,在玉海地区开展第四系厚度和基岩面顶深探测。为了查找基岩面,对实验区与示范区进行基岩调查,以获取基岩顶深度,为钻探取样提供深度参考资料,将探地雷达和单点电测深方法联合应用于玉海基岩调查工程。玉海工区位于康古尔断裂北沿,探测结果显示,在康古尔断裂北沿高台以南地区,新近系较薄,探地雷达和单点电测深方法可以有效探测基岩顶深度,南北方向上基岩顶深度与地形等高线成负相关关系,深度在1~21 m;东西方向上基岩起伏较大,表现为西部顶深度较深,大于12 m,中部较浅,在4~20 m;东部在8~30 m,第四系覆盖区中部部分地区可大于20 m,但范围较小。此次工程实践表明,将探地雷达和单点电测深方法联合应用于玉海基岩调查是可行的,为后期钻探和化探工作提供了可靠的基础资料。

In order to cooperate with the East Tianshan-Beishanarea geochemical exploration work,we carry out the Quatemary thickness and bedrock surface depth detection in the Yuhai area.In order to find the bedrock surface in Yuhai area,the bedrock survey was carried out on the experimental area and the demonstration area to obtain the depth of bedrock depth,to provide depth reference data for drilling sampling,and the combined application of ground penetrating radar and single point electric sounding method in bedrock Survey.Yuhai area is located in the north of the Kanggoul fault,the results show that in the south area that the along north side of the Kangguer fracture,Neogene thinner,the depth of the bedrock can be effectively detected by the ground penetrating radar and the singleelectron sounding method,There is a negative correlation between the bedrock depth and the topographic contour in the north and south direction,with a depth of 1~21 m;the bedrock fluctuation is larger in the east-west direction,showing a deeper depth in the west,more than 12 m eters,the middle of the shallow,in the 4~20 m,the eastern part of the 8~30 m,white board to the central part of the region can be greater than 20 meters,but the range is small.The engineering practice shows that it is feasible to combine the ground penetrating radar and single-point electric sounding method in Yuhai bedrock survey to provide reliable basic data for later drilling.