煤岩瓦斯“固-气”耦合物理模拟相似材料特性实验研究

发布时间：2018-07-22 13:28

【摘要】：在固体相似材料研究的基础上,利用"固-流"耦合相似理论,得出适用于煤岩瓦斯"固-气"耦合的相似条件。选用砂子为骨料,石蜡和油为胶结剂,研制出一种适用于开展"固-气"耦合模拟实验的材料。通过大量实验,对相似材料的抗压强度、脆性参数、渗透速率等物理力学进行了测试,并利用自行研制的渗透性测试装置,对不同含量胶结剂的相似材料试件渗透性进行了测试。结果表明,石蜡含量不断增大,材料抗压强度随之增大,渗透性逐渐减小;含油量的变化,消除了单纯使用石蜡时,材料抗压强度变化强烈的不足。合理调节二者之间的比例,可以模拟多种不同强度、不同渗透性的岩石。在力学参数满足模拟岩石的前提下,将研制出的新材料与原始的固相相似材料进行了渗流速度对比实验分析,得出所研制的材料能较大程度的降低气体在其中的渗流速度,并将该材料应用于煤层开采模型实验,有效的揭示了瓦斯渗透速率与上覆岩层运动之间的关系。
[Abstract]:Based on the study of solid similar materials and the theory of solid-flow coupling, the similarity conditions suitable for the solid-gas coupling of coal and gas are obtained. Using sand as aggregate and paraffin and oil as binder, a material suitable for solid-gas coupling experiment was developed. Through a large number of experiments, the compressive strength, brittleness parameters, permeability rate and other physical mechanics of similar materials have been tested, and the permeability testing device developed by ourselves has been used. The permeability of similar materials with different content of binder was tested. The results show that with the increasing of paraffin content, the compressive strength of the material increases and the permeability decreases gradually, and the change of oil content eliminates the shortage of the strong change in the compressive strength of the material when paraffin is used only. Reasonable adjustment of the ratio between the two can simulate a variety of rock with different strength and permeability. On the premise that the mechanical parameters are satisfied with the simulated rock, the seepage velocity of the new material developed is compared with that of the original solid phase similar material, and it is concluded that the developed material can reduce the seepage velocity of gas in it to a large extent. This material is applied to the coal seam mining model experiment, which effectively reveals the relationship between the gas permeability rate and the overlying strata movement.
【作者单位】：西安科技大学能源学院;
【基金】：新疆自治区科技厅科技支撑计划资助项目(201333110)
【分类号】：TD712

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