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“固-气”耦合相似材料的研制是“固-气”耦合相似模拟实验的基础,由于以砂子、石蜡、油为原料的相似材料抗压强度较低,变化范围不大,对于较高强度岩层的物理相似模拟效果不佳。在上述材料研究的基础上,以河砂为骨料,将已选胶结材料普通水泥和玉米淀粉作为影响相似材料的主要因素,进行配比设计、试件制作及参数测试,分析水泥及淀粉含量的变化对试件抗压强度σc及渗透率K的影响。实验结果表明:水泥在调节材料抗压强度方面起主要作用,淀粉在调节材料渗透性方面起主要作用,从而得到此新型材料的材料特性。运用此材料能够进行较高强度及低渗透率(在达西渗流范围内)的“固-气”耦合物理相似模拟实验,为“固-气”耦合物理相似模拟实验的开展进一步补充了实验基础。
The development of the “solid-gas” coupling similar material is the basis of the “solid-gas” coupling similar simulation experiment. Because the compressive strength of similar materials with sand, paraffin and oil as raw materials is low and the variation range is not large, Physical analogies for higher-intensity strata are ineffective. On the basis of the above materials research, taking the river sand as the aggregate, the cement and corn starch of the selected cementitious materials were selected as the main factors affecting the similar materials, and the proportioning design, specimen preparation and parameter testing were conducted to analyze the content of cement and starch The change of specimen compressive strength σc and permeability K. The experimental results show that the cement plays a major role in adjusting the compressive strength of the material, and the starch plays a major role in regulating the permeability of the material, thereby obtaining the material properties of the new material. Using this material, we can simulate the “solid-gas” coupling simulations with higher strength and lower permeability (within the Darcy seepage range), and further develop the “solid-gas” coupling physics simulation experiment Complement the experimental basis.