Research On Security Control Technology Of Tunnel Construction

With the development of the western development strategy implementation,in the central and western mountainous areas,the construction of the tunnel met unprecedented opportunities for development. However, because of the complexity of the geological and construction conditions, with the growing of the construction of the tunnel engineering,safety accident comes,this will not only cause huge economic losses,also causes the personal safety of tunnel workers. Under this background, the safety of the tunnel project is getting more and more attention of people, therefore, how to ensure safety in the process of tunnel construction is very worthy of study.Combination of the Liuguantun tunnel construction in Shanghai-Kunming railway passenger dedicated line,by studying the principle and technical parameters of radar, based on radar receives the echo time, amplitude and waveform information, such as to determine the structure of underground media and the position of the buried body and form. Through the analysis of the typical radar profile, the constraints of the radar antenna and whether the coupling constraints, the radar to detect near there is water to make a summary about metal objects and constraints, discusses the radar signal processing technology. For Liuguantun DK945 + 280 ~ DK945 + 460 section of tunnel using radar advance geological forecast result carried on the summary, Reach this level and the design of surrounding rock mass are consistent, both for Ⅳ level of surrounding rock, the geological conditions are added, and puts forward corresponding Suggestions on the tunnel construction.On the basis of advance geological forecast, through monitoring and timely grasp the deflection of the excavation section, determine the feasibility of the stability of surrounding rock and support scheme, the adjustment of the supports for the optimization of construction scheme and provide reliable basis, but also provide guidance for secondary lining of time, guarantee the stability of surrounding rock and construction safety. In the practical monitoring work, the data quantity is huge, the application of EXCEL for data computing, storage, on the one hand, workload is very big, on the other hand and error-prone. Therefore, in this case, the shanghai-kunming passenger dedicated monitoring group of Beijing university of technology based on Access database is developed for the platform construction of tunnel deformation monitoring data processing system, for monitoring data processing and application provides a great convenience, this to guarantee validity and guidance for the tunnel construction monitoring data of the construction has the important practical significance.Based on the large finite element analysis software MIDAS/GTS Liuguantun tunnel section in the reserved core steps method, the excavation and the five step excavation method reserved core method simulates the construction process, the three kinds of construction methods on the deformation of surrounding rock and supporting structure has carried on the comparison and analysis, reveals the tunnel under the various method distribution regularity of deformation of surrounding rock and supporting structure mechanics, it is concluded that Liuguantun paragraph using three steps excavation tunnel reserve the core of the construction method is feasible, site construction and verify the feasibility of this method.