The Research Of Tunnel Engineering Geological Exploration System Based On Induced Polarization Method

This paper describes the electrical exploration commonly used device and mechanism of induced polarization. The process of induced polarization of some important parameters are analyzed. The principle and method of Beam is introduced. The electric field distribution of geological anomalies are analyzed. Ansoft software is applied on simulation of various geological abnormal conditions. Electric field distribution changes affect the results of exploration is analyzed when geological conditions change. Simulation results are analyzed used Matlab software. Paper complete the measurement system design and production. Achieve the data collection and transmission. Measurement system is applied in the laboratory simulation. The experimental data were compared with simulation results.The paper analyze several analytical methods of more extensive application. This paper chiefly of describes electric field calculation based on finite difference method. Ansoft softwareis used to complete the model. Model is split. Boundary conditions and excitation voltage is loaded. Detection voltage of the transmission distance is simulated when exist for the protection and unprotected conditions. Draw the existence of high-resistivity anomalies and low-resistivity anomalies the electric field distribution potential diagram. Anomalies in different locations of the model and conditions of different shapes are simulated. Value table of the voltage on each measuring point are listed. This paper complete exploration system design and production. System consists of adjustable signal source, voltage acquisition device, channel switching device, communication devices, current monitoring device. Exploration device is applied to experimental. A variety of geological conditions were simulated experiments. Complete measurement data acquisition. Measurement results are stored in the PC. Results of experimental verify the simulation.Through simulation and experiment can be found anomalies of resistivity changes will make changes in the electric field distribution. When resistivity of anomaly is certain, Changing in position and shape of the measured voltage value will be affect. The geological prediction theory of Beam is better understood. Simulation results help to research the real-time detection of abnormal response characteristics and detection results of the interpretation.