The Application And Study Of TSP In The Tunnel Geological Prediction

In recent years, the national economy is developing fast, High speed railway, Highway, Urban rail transportation projects are in the large-scale construction,more and more number of tunnels,tunnel construction progress, tunnel construction safety often become the bottleneck of control of the project progress. In order to guarantee efficient construction tunnel, avoid blind construction bringing the safety accidents such as water-inrush,mud-inrush,landslides etc.,and reduce the economic loss, how to accurately understand the bad geological condition ahead of the working face has become urgent need to address the problem. Therefore, all kinds of the geological advanced prediction methods arises at the historic moment. Among them, the TSP seismic reflection wave method is based on seismic reflection wave theory,that produces seismic waves that spread to rock along the tunnel wails with a few explosives,when the waves meet the Formation boundary surface and the Relay surface,especially the fault fracture zone,karst, river in the undergrond, karst collapse column, silt take such as the harmful geological interfaces,Part of the seismic waves are reflected by the sensors,another part transmiss into Rock medium ahead with keeping spreeding,Analysising the reflected wave signals can find the properties and production shape of the bad geological interface .This method is of high precision and detect detection distance, would be able to detect the scope of the bad geological conditions within about 100m ~ 200m ahead of the Working face.But now the TSP seismic reflection wave method in tunnel geological forecast there exist some problems,the main problem is lack of specific interpreting marks on the bad geological interpretation, more depend on experience; the insufficient reliability for the classification of surrounding rock engineering and so on.Therefore, the current technology in theoretical analysis, data collection technology, forecasting accuracy and reliability should be further improved.This article mainly expounds the seismic reflection wave method, the basic principle of field work method,of TSP, TSP data processing flow chart,and discusses the feasibility of improving data quality, finally to with typical engineering examples, in previous research achievements, and on the basis of preliminary has established a set of TSP image features of the reflections in tunnel advanced prediction judge karst and fault fracture zone two typical bad geological body.The main knowledge obtained as follows:(1)Comprehensively analysis and evalue the current methods of tunnel advanced prediction,The TSP method with the reflected wave method for seismic reflection wave, relying on the basic theory and numerical analysis get effective information of rock each attribute parameter values, fastly and accurately position influence harmful geological objects ahead in location, size and shape.(2)Through hundreds of TSP experience in field data collection,and the TSP analysis of each data processing step, we find a feasible way to improve data quality, in the TSP data processing,I study the various methods and application of the principle, so that the final Two-dimensional map is generated more accurate..(3)Will the TSP systerm applied to DaRui Railway,YuMeng Railway,MuXin HIghway and DuWen Highway,based on two-dimensional results diagram and comparative analysis of various parameters change,in previous studies on the basis of results,preliminary summed up a set of TSP judgement interpreting marks in the advanced prediction in tunnel for karst and fault fracture zone.