硅微粉改性新型三维地震物理模型材料特性研究

Research on silica micro-powders modified 3-D seismic physical model materials

构建地震物理模型是模拟地质结构的重要手段,但是由于实际地质情况的结构多样性和物质多样性,导致探测信号的传播速度具有较大的分布范围.因此,为了对实际地质情况进行有效模拟,需要实现地震物理模型材料传播探测信号速度的可控调节.本文采用环氧树脂作为基材,使用硅微粉对其进行掺杂改性,制备出传播探测信号速度达到2850 m/s的有机-无机复合型模型材料,并实现了传播探测信号速度在2500~2850 m/s范围内的可控调节.研究表明,当使用硅微粉对环氧树脂进行掺杂时,其传播探测信号的能力得到明显提升;当掺杂量为50%时,模型材料传输探测信号的速度达到最大值2850 m/s,并且信号的振幅由纯环氧树脂的180 m V提高至420m V,这一结果将有利于该材料在大尺寸模型中的应用.除此之外,由于对制备工艺进行了优化,尤其是对固化剂进行了筛选,使得所制备的新型地震物理模型材料具有良好的稳定性,单次浇筑量大.当模型尺寸达到150 cm×120 cm×90 cm时,模型材料仍能保持良好的稳定性和均一性,未出现开裂等不良情况,该模型材料的开发将有利于地震物理模拟的相关研究.

The construction of seismic physical model is an important tool for the simulation geologic structure. Because of the structure diversity and material diversity of actual geology condition,the velocity of the rock samples distributes in wide range. Thus,to simulate the actual geology condition,it is required to control the velocity of the model materials. In this report,we developed an organic-inorganic hybrid model material using epoxy resin as the base material and silica micro-powder as the dopant. The velocity of the model material could be as high as 2851 m / s,and we realized the control of the velocity in the range of 2500 ~ 2850 m / s. When the doping amount is 50%,the speed increased to 2851 m / s and the amplitude increased from 180 m V to 420 m V,which will benefit itsfurther application in large-sized models. Besides,the stability of this novel seismic physical model material is enhanced due to the improved fabrication process, especially to the selection of the curing agent. When the model size was enlarged to 150 cm × 120 cm× 90 cm,the model material still presented good stability and uniformity, without any cracking phenomenon. These results indicated that this novel seismic physical model material will benefit the research on seismic physical simulation.