|
Abstract Geomechanical engineering problems were studied and stimulated using the principle of electromagnet force field to simulate gravity field in geomechanical model test based on electromagnet force system. Geomechanical problem can be studied by the model test of electromagnet force. In the model，the time and the geometric dimension are reduced with times，the acceleration of gravity g is amplified with times，the similarity ratio of the other basic material physical parameters all are 1. Prototype material in this geomechanical model test is chosen on the basis of electromagnet force theoretically，and it will provide convenience in model test operating. MageticMagnetic property of material is one of the key problems. The choice and basic property of geomechanical model test based on electromagnet force were introduced according to mixture and magnetic property of material. Magnet property of each mixture was studied to combinate need of geomachnical geomechanical model test. The relation between magnet force and magnetic strength and influence of moisture content were reseachedresearched with remagnetization and demagnetization. The electromagnet force is propositional to magnetic field gradient. A–200 magnetic powder¢s magnetic force multiple reaches 20.92 under 563.2 mT magnetic field intensity with mixture ratio 40% in remagnetization；C–180 magnetic powder¢s magnetic force multiple reaches 23.94 under 569.6 mT magnetic field intensity with mixture ratio 30% also in remagnetization. Based on the data from contrast tests，the selected two types magnetic powders can be considered as model material in the geomechanical experiments.
|
|
Received: 20 May 2009
|
|
|
|
