构造煤的常规三轴试验仿真参数敏感度分析研究  

Sensitivity analysis of conventional triaxial test simulation parameters for structural coal

作　　者：陈学雷 冉庆雷 Chen Xuelei;Ran Qinglei(Qipanjing Coal Mine,Mengxi Coal Chemical Co.,Ltd.,CHN Energy Group,Ordos 016064,China;State Key Laboratory of Coal Mine Disaster Prevention and Control,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]国能蒙西煤化工股份有限公司棋盘井煤矿,内蒙古鄂尔多斯016064 [2]煤矿灾害防控全国重点实验室,重庆400037 [3]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《能源与环保》2024年第8期6-13,21,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金面上项目(52274150);中煤科工集团重庆研究院有限公司自立创新引导项目(2023YBXM32)。

摘　　要：目前,煤与瓦斯突出、冒顶等动力事故不间断发生,严重威胁煤矿安全生产,揭示动力灾害背后煤岩体力学损伤演化机制至关重要。利用离散元软件PFC^(3D),构建了以构造煤体为原型的颗粒流模型,通过改变模型的接触模量、刚度比、黏结强度比、内摩擦角、摩擦因数参数,对模型进行了常规三轴试验仿真参数敏感度分析。结果表明,接触模量对构造煤模型力学性能的影响主要体现在模型变形性能;刚度比对构造煤模型的强度和变形特性存在影响;黏结强度比对构造煤模型的最大抗压强度与峰值应变均有影响;内摩擦角对模型的损伤破坏形式存在影响;摩擦因数对构造煤模型影响体现在模型的强度与峰值应变。而后指导了参数标定过程,得出模拟结果与实验结果具有较好的一致性。研究结果为后续煤岩动力灾害机理的研究奠定了基础。Dynamic accidents such as coal and gas outburst and roof fall occur continuously,which seriously threaten coal mine safety production.Therefore,it is very important to reveal the evolution mechanism of mechanical damage of coal and rock behind dynamic disasters.A particle flow model based on structural coal body was constructed by using discrete element software PFC^(3D).By changing the contact modulus,stiffness ratio,bond strength ratio,friction angle and friction factor parameters of the model,the sensitivity of conventional triaxial simulation parameters of the model was analyzed.The results showed that the influence of the contact modulus on the mechanical properties of the structural coal model was mainly reflected in the deformation properties of the model.The change of stiffness ratio had influence on the strength and deformation characteristics of the structural coal model.The bond strength ratio had influence on the maximum compressive strength and peak strain of the structural coal model.The internal friction angle had influence on the damage pattern of the model.The influence of friction factor on structural coal model was reflected in the strength and peak strain of the model.Then the process of parameter calibration was guided,and the simulation results were in good agreement with the experimental results.This lays a foundation for the subsequent research on the mechanism of coal and rock dynamic disaster.

关 键 词：构造煤 颗粒流模拟 参数敏感度 平行黏结模型 细观参数 

分 类 号：TD712[矿业工程—矿井通风与安全]