地质力学磁力模型试验相似材料磁力特性研究

第28卷增2岩石力学与工程学报V ol.28 Supp.2 2009年9月Chinese Journal of Rock Mechanics and Engineering Sept.，2009 地质力学磁力模型试验相似材料磁力特性研究

罗先启1，葛修润1，程圣国2，张振华2，唐凯2

(1. 上海交通大学船舶海洋与建筑工程学院上海 200030；

2. 三峡大学三峡库区地质灾害教育部重点实验室，湖北宜昌 443002)

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563.2 mT，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569.6 mT，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。

关键词：地质力学；模型试验；电磁力场；重力场；相似理论；相似判据；磁性材料

中图分类号：P 55 文献标识码：A 文章编号：1000–6915(2009)增2–3801–07

STUDY OF MAGNETIC MATERIAL PROPERTY OF GEOMECHANICAL MODEL TEST IN ELECTROMAGNET FIELD

LUO Xianqi1，GE Xiurun1，CHENG Shengguo2，ZHANG Zhenhua2，TANG Kai2

(1. School of Naval Architecture，Ocean and Civil Engineering，Shanghai Jiaotong University，Shanghai200030，China；

2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，

Hubei，Yichang443002，China)

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 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

收稿日期：2009–05–20；修回日期：2009–07–29

基金项目：国家自然科学基金资助项目(50679037)；湖北省自然科学基金项目(2005ABA295)；湖北省教育厅科学研究计划项目(Z200513003)

作者简介：罗先启(1965–)，男，博士，1986年毕业于天津大学水利工程系，现任教授、博士生导师，主要从事岩土工程方面的教学与研究工作。

E-mail：luoxianqi@