Equipment Supporting Of Roadway BOTDR Deformation Monitoring Theory And Experiment Research

The surrounding soil and rock of tunnel during the tunnel drivage is affected by the external stress and vibration of boring machine, and often make fast and furious deformation between two sides and the top of tunnel. Research on the appropriate supporting is the key to ensure tunnel construction safety. Based on dynamic characteristics of tunnel surrounding rock and temporary support mechanism in the further study of the tunneling process and in the light of self-mobile temporary support system around the force deformation monitoring system, we develop relevant research. We first try to apply BOTDR (Brillouin Optical Time Domain Reflectometer) to the process of temporary support frame force deformation and tunnel deformation monitoring and put forward the real-time, long-term, comprehensive deformation monitoring theoretical and experimental scheme during tunnel drivage, raise small BOTDR design scheme and experimental prototype and design a tunnel model and complete the relevant experimental study on this model.Research on the tunnel metal support and wall can achieve comprehensive real-time monitoring method and process, and raise effective theory scheme to improve the monitoring accuracy of BOTDR, which can further improve the measurement range and measurement accuracy of BOTDR; then complete the design and development of several key technology and devices in the fiber optic cabling construction process based on the experiment; and put forward an underground engineering network scheme with the monitoring data collection, storage and intelligent processing ability based on BOTDR under the framework of the Internet of things, in order to comprehensive improve the accuracy of stress change in the grid structure and realize the innovation with the structure and method.The paper analysed deformation and designed routing monitoring scheme for U shape yieldable steel ribs and the self-mobile temporary support and explored the dispersion compensation scheme which is a useful attempt to improve measuring accuracy.The research results may provide a new measuring method for tunnel deformation during tunnel drivage and permanent support deformation monitoring. The monitoring data applying this method provides an important reference for the theory research of self-mobile supporting research and rock dynamics during tunnel drivage and have the important theory and application value.The main research contents are followed:Present a new sensor to detect the grid structure. The scheme can be run completely in the existing BOTDR equipment, grid of fiber optic cabling can obtain the whole deformation surface data. While the surface data measurement has higher measurement precision than traditional line data measurement.In the light of self-mobile temporary support system around the force deformation monitoring system, we first try to apply BOTDR to the temporary support frame force deformation and tunnel deformation monitoring.Propose and research two methods of improving detection distancet to increase the dispersion compensation and pre dispersion equipment scheme for BOTDR, the input signal dispersion is greatly reduced through theoretical analysis and numerical simulation.Present the application of time domain calibration technique and optical soliton technology on BOTDR and can provide a time division for the fiber optic strain data through time domain calibration and analyse the method to improve the measurement accuracy mechanism of BOTDR, then further improve the detection distance and accuracy of BOTDR using constant properties of optical soliton pulse.Design the tunnel model and use BOTDR equipment to carry out experimental study and obtain some column time series data of phase transition, whose data can provide samples in the later study. And carry out optical fiber laying and measurement experiment for the actual tunnel, and then obtain some preliminary experimental results to verify the feasibility of BOTDR in real-time monitoring of underground tunnel. And thus raise two kinds of new technology and method,that is the marble glue adhesive and optical fiber.Put forward a design scheme of small BOTDR strain gauge. The core idea of the miniaturization of BOTDR is to make full use of existing large scale electronic integration technology, microwave integrated technology and photonic integration technology in order to develop and replace to achieve the purpose of miniaturization through the device.Put forward the networking scheme for underground engineering monitoring based on BOTDR. It is almost not achieved by only one method from the aspect of underground engineering construction safety and security monitoring. And it must make comprehensive use of data, voice and video information to conduct a comprehensive monitoring. And configure several high performance computing center for BOTDR through the IP network connection in BOTDR monitoring system and achieve automatic transmission of data storage, data analysis and data collection to form a intelligence center, network structure of completing BOTDR.