Experimental Research On Laws Of Geomagnetic Variation Simulated With Natural Magnetic Fault Extrusion Of Rock Plates

The thesis is based on the curve of geomagnetic diurnal variation of Zheng zhou earthquake. The earthquake process is divided into three stages, early earthquake, mid-term earthquake and the earthquake birthday. According to the three stages of geomagnetic diurnal variation curve of specimen, indoor simulation experiments are conducted with natural magnetic fault rock plates and collected the vertical force, vertical displacement, magnetic induction and the crack width curve of variation with time during the test. In the external parameter for magnetic induction intensity, vertical force, vertical displacement, crack width as internal variables, combine with the external parameters and internal parameters, to understand the mechanical background of earthquake geomagnetic.After creating the complete simulation test system, the typical earthquake geomagnetic diurnal variation curves and simulated was selected by controlling the vertical force loading and unloading rate, to realize the magnetic induction intensity changes according to the curve trend. The control interface test shows the vertical displacement and time curve, and with the whole hand writing magnetic, controling experiments’loading and unloading rates. The crack opening and closing state and the magnetic source move will affect the size of the magnetic induction. The crack width increases, then the magnetic intensity increases; the width of the cracks is reduced, then the magnetic intensity is reduced too.The vertical force, vertical displacement, crack width and the change of the magnetic are inducted by corresponding to the four parameters of a positive correlation. When the load of the vertical force and vertical displacement increase, the cracks develop, the magnetic induction increases; when the force unload, vertical displacement decreases, the crack closure, the magnetic induction decreases. Vertical force, vertical displacement, crack width and the magnetic induction curve will have several time, changes in the vertical forces advance on the strength of the magnetic induction, vertical displacement and magnetic induction intensity quite crack width changes will change at the same. Three times were tested on each geomagnetic curve simulation test results were the same, the repeatability was possible. The results show that the force of change is the reason of the fault movement, fault movement before the formation of larger displacement, the magnetic induction will be a precursor.The seismogenic geomagnetic curves and the mechanical background are priored to the reference line inoculation contrast mechanical background curves into the middle and earthquake birthday geomagnetic diurnal and earthquake. Reference geomagnetic diurnal variation curve and seismic active medium plus the earthquake birthday magnetic anomaly curve. Each stage of the geomagnetic field simulation curves was corresponded to the earthquake. The test results were applied to the study of the earthquake process.