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实验室开展“固-气”耦合相似模拟实验,是研究卸压瓦斯运移规律的主要方法之一,煤岩瓦斯“固-气”耦合相似模拟材料的开发是“固-气”耦合相似模拟实验的基础。借助正交实验方法,将已选胶结材料石蜡和油作为影响相似材料的主要因素,对试件在改变胶结剂材料含量的条件下开展正交实验,分析石蜡和油对试件弹性模量E及渗流速度v的影响。从抗压强度σc、抗拉强度σt、弹性模量E、脆性参数E/λ及渗透性等方面,对不同配比条件下的相似材料试件开展实验研究。通过对实验数据的拟合,并结合渗透率计算公式,得到了渗透率随石蜡含量变化的方程,表明相似材料渗透率随着石蜡含量的增加,呈负指数函数变化。从而研制出能够应用于“固-气”耦合物理相似模拟实验的相似材料,为“固-气”耦合物理相似模拟实验的开展奠定了基础。
In the laboratory, the “solid-gas” coupling simulation experiment is one of the main methods to study the law of pressure relief gas migration. The development of coal-seam gas-solid-gas coupling simulation material is “ Gas ”coupling similar simulation experiment. Orthogonal experimental method, the selected cement material paraffin and oil as the main factors affecting the similar materials, the specimen under the conditions of changing the binder material to carry out orthogonal experiments to analyze the paraffin and oil on the specimen elastic modulus E And seepage velocity v. From the aspects of compressive strength σc, tensile strength σt, elastic modulus E, brittleness parameter E / λ and permeability, the experiment of similar material specimens with different matching conditions was carried out. By fitting the experimental data and calculating the formula of permeability, the equation of permeability changing with paraffin content was obtained, which shows that the permeability of similar materials shows a negative exponential function with the increase of paraffin content. The similar material that can be applied to the “solid-gas” coupled physical analog simulation is developed, which lays the foundation for the development of the “solid-gas” coupled physical analog simulation.