走航式电阻率法探测平原水库库底砂体效果分析及应用OA北大核心CSTPCD

The sand body at the bottom of a plain reservoir has an undeniable impact on the safety of reservoir operation and the construction of underground spaces passing through the reservoir.A rapid and accurate detection method for identifying the spatial position of the sand bodies at the bottom of the reservoir will provide technical support for solving the above problems.This study takes the Queshan Reservoir in Jinan,located in the Yellow River Basin,as the study area.Based on numerical simulation and in-situ detection results,the ability and optimal device parameters of the navigable resistivity meth-od to identify the sand bodies at the bottom of the plain reservoir were analyzed and evaluated.And the obtained theory was applied and verified in in-situ detection.The main conclusions are as follows.The navigable resistivity method has good theoretical resolution ability for sand bodies with shallow burial depth(＜30 m)and large thickness(＞6 m).For deeply buried sand bodies(＞10 m)with thin thick-ness(≈2 m),it is difficult to identify them.The offset distance between the detected and actual top(bottom)boundary of sand is positively correlated with the burial depth of the top boundary and the length of the sand body.Increasing the thickness of the sand body will increase the difference in the off-set distance of the sand body boundary under different top boundary burial depths.The offset distance is positively related to the thickness of the deep buried sand body and negatively related to the thickness of the shallow buried sand body.A method has been established to correct the in-situ detection results and identify sand bodies.The sand body morphology identified based on in-situ detection results is not accu-rate,and its thickness is generally about 0～3 m thicker than the actual sand body thickness.Thin sand bodies with a thickness of less than 3 m are difficult to identify using this method.