Distributed Monitoring Of Deformation Of Overlying Strata In The Three-dimensional Model And Software Development For Processing The Data It Monitors

Three dimensional similarity simulation test is one of the most important methods to study the strata behavior and the deformation characteristics of overburden strata,However,the three dimensional similarity model of large thickness,internal rock deformation characteristics of mobile model cannot be seen by the naked eye,can not know the strata behaviors and overburden deformation,and therefore must rely on other methods for monitoring movement on the internal rock deformation model.In this paper,the sensing principle of pulse-prepump brillouin optical time domain analysis technique is introduced.The relationship between Brillouin frequency shift and temperature and strain is analyzed;At the same time,analysis of the Brillouin frequency shift curves of vertical fiber characteristics and overburden deformation characteristics,puts forward the vertical distributed optical fiber identification simulation method of three dimensional similar pressure test based on;Also,based on the analysis of the characteristics of the Brillouin frequency shift curve of vertical optical fiber,a method for determining the deformation height of the overburden rock and the height of the caving zone is presented.In order to verify the correctness of the method,through to simulate in the laboratory working face in the process of mining rock deformation characteristics as the goal,the design of three-dimensional similar material simulation experiment,the analysis of construction technology of distributed optical fiber sensing monitoring system of pre pump pulse Brillouin optical time domain,at the same time in order to verify the accuracy of the monitoring results of the distributed optical fiber,self design a three-dimensional model of internal displacement measuring device,and two sets of this monitoring system and applied to the simulation of overlying strata in the corresponding overburden deformation monitoring.Three dimensional simulation test results show that the distributed optical fiber sensing technology pre pump pulse Brillouin optical time-domain analysis for the three-dimensional model simulation of working face pressure is determined based on the position,while determining the height of three-dimensional model of internal deformation and collapse height,This technology provides a pair of “eyes” that can be used to observe the deformation of the three-dimensional model.At the same time,in order to make the information fast acquisition,developed the analysis system of distributed optical fiber data processing,the development of this system makes the test data processing can quickly display,grasp the internal deformation of overlying rock,changed the "first test-postprocessing" test mode,the test and data processing of synchronous processing.Besides,the development of this system can improve the efficiency of the observation and provide guidance for the application of this technology in the field.