煤体相似材料孔隙率调控方法及正交试验研究  

Investigation of porosity control methods and orthogonal testing of coal-similar materials

作　　者：张春华 李崎纶[1] ZHANG Chunhua;LI Qilun(College of Safety Science and Engineering,Liaoning Technical University,Huludao 125105,Liaoning,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University,Huludao 125105,Liaoning,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105 [2]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105

出　　处：《安全与环境学报》2024年第8期2970-2980,共11页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51974149,52374204)。

摘　　要：孔隙是煤层瓦斯赋存和运移的重要影响因素,但目前煤与瓦斯突出相似试验材料较少考虑孔隙率相似性。优选樟脑颗粒作为煤体孔隙率调控材料,考虑不同樟脑颗粒级配、质量分数、成型压力及水泥质量分数因素影响,基于正交设计制备16个相似材料试件,通过测试各试件的孔隙率、坚固性系数、瓦斯放散初速度和渗透率参数,建立诸影响因素与试件参数间的量化关系式,进而获得了林盛煤矿突出煤层煤样相似材料的配比,并进行了验证。结果显示:樟脑颗粒比干冰颗粒更适合作为孔隙率调控材料,樟脑颗粒质量分数对材料孔隙率影响较大,级配影响较小;通过樟脑颗粒孔隙率调控所制备的试件与原煤样坚固性系数、放散初速度和渗透率均具有良好的相似性。Coal-similar materials form the foundation for simulating tests.Porosity significantly impacts the generation and movement of coal seam gas.Currently,the similarity of porosity is often overlooked in materials used for simulating coal and gas outbursts.By incorporating porosity control materials into the raw materials,it becomes possible to regulate the porosity of the similar materials by leveraging their inherent volatilization or melting characteristics.In this study,camphor particles were chosen as the porosity control material for coal bodies.To account for the impact of various factors such as camphor particle gradation,camphor particle mass fraction,molding pressure,and cement mass fraction,an orthogonal design method was employed.This method facilitated the execution of an orthogonal matching ratio test on similar materials with four factors and four levels.Consequently,16 similar material specimens were meticulously prepared.Subsequently,each specimen was subjected to testing to determine the porosity,firmness coefficient,initial velocity of gas emission,and permeability parameters.By conducting variance analysis and multiple linear regression analysis,the quantitative relationship between the influencing factors of the similar materials and the simulation indexes was established.Furthermore,a multiple linear regression equation was derived to demonstrate the relationship between these factors.Building on these findings,the ratio of similar materials for coal samples in the outburst coal seam of Linsheng Coal Mine was determined and confirmed through experimentation.The results indicate that camphor particles are better suited as porosity control materials compared to dry ice particles.The mass fraction of camphor particles exerts a significant influence on the material s porosity,while the particle gradation has a minor effect.As the mass fraction of camphor particles increases,the porosity of similar materials also increases.The specimens prepared using the porosity control method with camphor particle

关 键 词：安全工程 煤体相似材料 樟脑颗粒 孔隙率调控 正交试验 

分 类 号：X936[环境科学与工程—安全科学]