The Software Design Of Water-bearing Geological Structure Detection System In Tunnel Based On LabVIEW

Tunnel is a kind of architectural formation that people put the project into underground spaces. At present, with the construction of a series of large-scale tunnel projects, China has the largest number of tunnel construction, the largest size of the tunnel construction and the fastest pace of the development of tunnel project in the world. However, those complex geological conditions and frequent happened geological disasters have been a threat to the safety of the tunnel project, all the time. Among them, the water or mud inrush disaster have brought many casualties and property damage to the tunnel construction, and the damage of ecological geological environment of the surface and the tunnel site can not be repaired. Therefore, finding a set of effective tunnel geological detection methods is urgent.The combination of spontaneous potential method, resistivity method and time domain induced polarization (IP) method can effectively predict the water contained structure in the front of the tunnel. This kind of combined detection method can realize the mutual compensation of the parameters, the multi solution of the conclusion,so that the existence, position and content of water structure can be predicted, and the reliable geological information of tunnel construction can be provided.On the other hand, the virtual instrument is the development direction of modern test technology and instrument technology. General computer is used as the unified hardware System of virtual instrument. The performance advantage of general computer has been made full use of virtual instrument. So that the function of the traditional instrument and control panel is software in the virtual instrument. In this way, the advantages of the resources of general computer and the specialized function of the traditional instrument are perfectly combined, and a new instrument of "software is the instrument" is formed. The concept of virtual instrument is first proposed by the American National Instruments Company, who introduced the LabVIEW graphical programming environment which is based on the idea of the design of virtual instrument. LabVIEW is the major programming environment in the field of virtual instrument developing.A system which is suitable for tunnel advance water predicting is constructed in this paper with the using of the NI USB-6289 data acquisition device. And its software System is a friendly interactive virtual instrument one based on LabVIEW development environment. This software system adopts three kinds of electrical method of comprehensive detection, overcomes the defect of previous software system that the acquisition part and power supply part had been controlled apart, so the power-off moment had to be determined based on data. The detection accuracy and reliability prediction is further improved.First of all, this paper introduces the research background and the development status of the field. Secondly, the combination of natural potential, resistivity method and time domain induced polarization method is analyzed. Thirdly, combined with the specific indicators, the overall program is designed. After that, the software realization scheme is introduced in detail module by module, such as the user loginning module, the open file module, the engineering setting module, the measuring setting module, grounding resistance module, resistivity method module and excited polarization method module. Finally, the software system has been debugged, modified and optimized in the simulation testing, and the test of the field has been passed. The system meets the design demand, the performance is stable and reliable and the operation is convenient for the field personnel to control.