Research On Application Effect And Influencing Factors Of TSP Method In Tunnel Geological Prediction Of Fuxia High-speed Railway

Under the guidance of China's construction of eight vertical and eight horizontal railway networks,the construction of high-speed railway has entered a period of rapid development,and the Fuxia High-speed Railway came into being under this background.The FuzhouXiamen High Speed Railway is the second express railway in Fujian Province,with a main line length of 277.42 kilometers and a design speed of 350 kilometers per hour.The line traverses multiple fault zones.In order to meet the design requirements of driving speed,safety and comfort,a large number of tunnels have been built on the line.The total number of tunnels reached 47 and the total length is about 65 kilometers.As a kind of underground concealed project,the tunnel will not be able to clarify the geological situation in front of the working face in time due to the limitation of Geological survey data.Therefore,accidents such as water and mud burst and collapse are caused,which threaten the safety of personnel and property.Adopted TSP measurement technology for tunnel geological prediction in order to ensure construction safety during the construction of the Fuxia High-speed Railway.TSP technology is widely used in the construction of domestic railway tunnels and has been recognized by the public,but there are still some shortcomings: The data collection process is demanding,data processing has a great influence on the final detection result,the detection effect is different for different geological bodies,there are many factors that affect the accuracy of the final forecast results,data interpretation depends on experience,etc.In view of the above shortcomings,this article did the following research:(1)Using tesseral software to study the forward modeling of TSP seismic wave field.Several common typical bad geological bodies in tunnels such as fault fracture zone,lithology change zone and karst cave are simulated to obtain different wave field characteristics and compare the reflection effect of TSP detection technology under different geological bodies.(2)Analyzed the setting of TSP203 PLUS hardware equipment and observation system applied in the geological prediction project of Fuxia High-speed Railway.Analyzed the principles of 12 steps such as band-pass filtering,first break picking,and shoot energy balance in the TSPWIN software processing flow.Study the correlation between processing results of software and different geological bodies(3)Study the impact of 6 parties including excitation conditions,reception conditions,noise,software processing,geological conditions and data interpretation on the accuracy of the final forecast.(4)Combining with 6 typical application cases such as the fracture zone,the dense joint zone and the rock boundary zone in the tunnel geological prediction of Fuxia High-speed Railway,introduce the process from data processing to geological interpretation in detail.Analyze the application effect of TSP measurement technology in Fuxia High Speed Railway.Draw the following conclusions:The detection result has small error and is reliable,which can make up for the shortcomings of geological survey and meet the construction needs of the construction unit.