| With the development of economic construction in southwest China,more and more infrastructure,especially the construction of highway and railway,has been put on the agenda.Unlike the north China plain area and the southeast coastal areas,China’s southwest mountains and lush vegetation,in such conditions,build up the winding mountain road will be costly,and may cause great difficulties to construction and risk,also can cause serious damage to the natural environment.Considering the security and environmental problems of transportation capacity,the large section mountain tunnel quickly becomes the choice of highway construction in southwest China.Different from city road railway tunnel,the heavy section mountain tunnel because of its cross section is too large,special construction environment,often using new Austrian method for excavation,as one of the new Austrian method,key technology,and smooth blasting in tunnel construction will inevitably bring the ultra dig,dig less problem.Once appear,overbreak phenomenon,conventional tunnel monitoring methods may be due to not good coupling with surrounding rock.In order to make up for the deficiency of routine monitoring method,the microseismic monitoring technique has been paid more and more attention.Microseismic monitoring technology as a way to realize the micro fracture rock mass event location and disaster warning of emerging technology,in the research in recent years the rapid development,and in a large number of engineering construction,especially in complex conditions has been widely used in the construction of underground engineering.The microseismic monitoring technology can analyze and locate the waveform received,so as to obtain the "spatio-temporal strength" information of the microseismic event in the surrounding rock,and provide the geological forecast and early warning for tunnel construction.In this paper,based on the tunnel no.1 of qichong village,1.5 huan chun avenue,guiyang city,the following work is carried out by using micro-seismic monitoring technology combined with TSP advanced geological prediction technology:(1)In combination with seismology and damage mechanics,the working principle,composition,structure and function of microseismic monitoring system are briefly introduced.The characteristics of microseismic monitoring technology and its unique advantages are analyzed.(2)The geological forecast of the front area of the palm surface was carried out by using TSP advanced geological prediction technology to provide fault data for the project and to determine the key monitoring range of the microseismic system.Combined with the site construction plan and geological data,the technical scheme of the high precision micro-seismic monitoring and imaging system of the tunnel was developed,and the field layout and data acquisition of the microseismic system were carried out.The microseismic monitoring system is used for real-time monitoring of surrounding rock disturbance caused by tunnel construction.The data is collected and the microseismic signals received are located.(3)Together with the cooperation unit for data post-processing,using 3 d visualization software(DIS)for microseismic monitoring daily,weekly and monthly reports,provide suggestion and reference for site construction.(4)The finite element software MIDAS/GTS to seven village no.1 tunnel accident location modeling,three-dimensional numerical simulation analysis,the simulation results compared with processed seismic event information,analysis of numerical simulation,the corresponding relationship between the measured data of the feasibility of the microseismic monitoring system. |
PDF Full Text Request