Research On The Analytical Application And Improvement Of Three-dimensional Geological Structure Based On TRT System

With the country’s massive investment in infrastructure,water conservancy projects,road projects and railway projects are developing rapidly.A large number of tunnel projects have appeared in the process of these infrastructures.The geological condition of tunnel engineering is becoming more and more complicated.The length of the crossing is getting bigger and bigger.In the process of construction,it is inevitable to encounter the bad geological body which has the hidden danger to the tunnel construction.Therefore,advanced geological prediction work is very necessary.The paper mainly relies on the Shanghai Kunming high-speed railway,Guiyang Wengan expressway tunnel projects.Centre on TRT6000 Technology.This paper mainly carried out the following works.(1)Combined with TRT6000 Technology.The types of artificial seismic wave and the propagation law of seismic wave in rock mass are studied systematically.Including the attenuation law,Huygens principle,Fermat’s principle,apparent velocity theorem,reflection and transmission of seismic waves.The relationship between the density,porosity,pore filling and weathering of the rock mass was studied.(2)Through the study of TRT6000 advanced geological prediction examples.This paper summarizes the common geological phenomena during the construction of karst tunnels.Including joint fissure development zone,fault zone,karst caves,weak rock.The mechanism of the influence of four kinds of bad geological phenomena on the stability of tunnel during construction is studied.The typical features of the TRT system image corresponding to the bad geological phenomena are classified and summarized.The accuracy of the TRT system for the detection of various geological phenomena is analyzed.(3)The calculation of direct wave velocity is improved.According to Fermat’s principle,the actual path of seismic wave propagation in two types of tunnels is summarized,and the calculation formula of direct wave is summarized too.(4)Data analysis of the acquired direct wave velocity was carried out.The Jarque-Bera test is used to prove that the direct wave velocity is in accordance with the Gauss distribution.A method for processing background wave velocity by Gauss distribution is proposed.And sums up the calculation formula of the upper and lower bounds of the background wave confidence interval under Gaussian distribution.(5)Based on the results of the blue yellow chromatogram and the chromatogram of the purple belt,the prediction results of different background wave velocities are compared.Combined with the actual excavation position,it is proved that the prediction effect of the improved direct wave velocity is closer to the actual excavation effect,and the interval of the upper and lower limits of the confidence interval can be included in the actual position of the disaster.In areas with poor geological conditions,the use of Gaussian distribution to deal with direct wave velocity approach can effectively avoid the omission of adverse geological bodies.