中文摘要：

地质力学磁力模型试验是利用电磁力（场）模拟重力（场）的原理来研究地质力学工程问题的试验方法。在模型中,时间t、几何尺度l缩小n倍、重力加速度g扩大n倍,而材料的其他基本物理力学参数的相似比均为1,从理论上说可以采用原型材料进行地质力学磁力模型试验,这在模型试验的操作上十分方便。磁性材料的磁力特性是磁力模型试验方法的关键。磁粉、土体、水在电磁场中表现出不同的电磁和磁力特性。磁粉材料的电磁特性由磁回滞曲线表示。磁性材料在电磁场中的磁力与磁场强度的梯度成正比。A-200磁粉在磁感应强度为563.2mT,磁粉含量为40%时的最大磁力倍数为20.92,并发生于第二次加磁;C-180磁粉在磁感应强度为569.6mT,磁粉含量为30%时的最大磁力倍数为23.94,也发生于第二次加磁,这2种磁粉均可考虑作为磁力模型试验的模型材料。

英文摘要：

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 t and the geometric dimension l are reduced with n times,the acceleration of gravity g is amplified with n 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.Magnetic 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 geomechanical model test.The relation between magnet force and magnetic strength and influence of moisture content were researched 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.