In order to delineate the hidden geological structure of the tunnel,determine the distribution and lithology of the strata,the construction project of the public mining product transportation corridor in Guichi District is taken as the research object.The high-density electrical method Wenner Schlumberger device is used to measure the apparent resistivity of the rock and soil in the site,analyze the lithology of the ground layer in the tunnel body section,the degree of rock weathering,the distribution of hidden geological structures,and the undulating shape of the bedrock surface.The results show that the bedrock strata of the C1-02 and C1-03 tunnel sections are medium to slightly weathered quartz sandstone,siltstone,and sandy mudstone of the Lower Silurian Gaojiabian Formation;The overall geological strata of the entire tunnel section are divided into two layers.The shallow layer has a low resistivity and is composed of the Quaternary residual slope layer(including the weathered bedrock layer),while the deep layer with high resistivity is a reflection of the middle to slightly weathered fine sandstone,siltstone,and sandy mudstone of the Lower Silurian Gao-jiabian Formation;There are two abnormal fault structures delineated in the body section of the C1-02 tunnel,all of which reflect low blocking anomalies.The F21 fault structure is located at the tunnel mileage K2+513,running north-east and leaning southeast,with a steep attitude;The F22 fault structure is located at K1+988,trending northeast and tilting southeast;At the entrance of the C1-03 tunnel,K2+710～K2+800 show a low resistance anomaly,which is interpreted as a thicker shallow covering layer.
万方数据
维普
