High-density Surface Wave Application For Rapid Inspection Of The Integrity Of Dike Cutoff Walls

Songhua River is one of the seven major rivers in China.Its north source nen River originates from the south of Mountain in Daxingan Mountain.The second Songhua River in south originates from Tianchi Lake in Changbai Mountain.The two rivers are called the main stream of Songhua River after confluence at the Sancha River Estuary.The main stream of the Songhua River flows from the southwest to the northeast to the River in Tong jiang,with a total length of 939 kilometers.The Songhua River main stream control project,which was implemented in August 2015,is one of the 172 major water conservancy projects in the country,and the length of the embankment is 1363.Kilometers,of which 320 km of seepage control measures are set,of which vertical impervious walls account for 198 km.The quality of the embankment wall is related to the safety of the dike and the safety of the people along the line.Therefore,it is necessary to seek a quick,accurate and non-destructive testing measure.Based on the actual research of song hua River treatment project,this paper combines Rayleigh wave method,high-density method,transient electromagnetic wave method,geological radar method and other mature detection methods to carry out field test and model test,and develop a rapid detection device system.Finally,combined with the experimental data analysis results to test the feasibility of the device.The specific content includes:(1)First understand the principle of surface wave detection,comprehensively grasp the general situation of the cement soil seepage prevention wall,explore the internal structure of the dike,the external situation of the dike and the ancillary works,clarify the technical points and difficulties,and formulate research plans.(2)Establish a numerical calculation model suitable for this topic.Using the finite element method and the infinite element program,the dynamic finite element method is used to simulate the elastic wave of the embankment soil and the anti-seepage wall structure.According to the calculation results of the model,the propagation characteristics of elastic waves in the dam model are analyzed,and a high-density surface wave rapid evaluation method based on spatial analysis technology is established.(3)Conduct on-site testing.A section of embankment was selected as the experimental site,and the integrity of the anti-seepage wall was evaluated by presupposing local looseness,longitudinal joint,insufficient depth,and tilting of the body.