煤体结构面发育对岩-煤-岩组合体力学及破坏特性的影响  

Influence of Coal Structural Plane Development on the Mechanics and Failure Characteristics of Rock-Coal-Rock Combination

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作  者:董卓 石莹莹 DONG Zhuo;SHI Yingying(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China)

机构地区:[1]河南理工大学能源科学与工程学院,河南焦作市454000

出  处:《矿业研究与开发》2024年第10期107-114,共8页Mining Research and Development

基  金:国家自然科学基金青年基金项目(52104084);河南省高等学校重点科研项目计划(22A440010);河南省科技攻关项目(222102320271,232102321128)。

摘  要:通过构建煤体结构面发育数字图像并结合RFPA数值模拟方法,构建了岩-煤-岩组合体数值计算模型,研究了层理倾角、煤-岩界面倾角、煤-岩高度比对岩-煤-岩组合体力学及破坏特征的影响。研究结果表明:不同层理倾角下岩-煤-岩组合体的抗压强度呈典型的“U”形各向异性特征;宏观剪切破坏主要集中在煤体中,青砂岩中形成少量的拉伸裂纹;受层理及煤-岩界面倾角的影响,岩-煤-岩组合体峰后应力表现为迅速跌落、分级跌落两种特征,进而影响其脆性程度;岩-煤-岩组合体的强度和变形特征主要由强度较弱的煤体决定,其峰值强度和弹性模量均随着界面倾角的增加逐渐降低。研究成果克服了以往数值模拟时将煤体假定为均质体的不足,有望为深入探究煤体结构面发育对岩-煤-岩组合体力学特性及变形破坏特征的影响提供参考。The numerical model of rock-coal-rock combination was constructed by constructing the digital image of coal structural plane development and combining with RFPA numerical simulation method. The effects of bedding dip angle, coal-rock interface dip angle and coal-rock height ratio on the mechanics and failure characteristics of rock-coal-rock combination were studied. The results show that the compressive strength of rock-coal-rock combination under different bedding dip angles is characterized by typical U-shaped anisotropy. The macroscopic shear failure is mainly concentrated in the coal body, and a small amount of tensile cracks are formed in the green sandstone. Under the influence of bedding and coal-rock interface dip angle, the post-peak stress of rock-coal-rock combination is characterized by rapid drop and graded drop, which affects its brittleness. The strength and deformation characteristics of the rock-coal-rock combination are mainly determined by the coal body with weak strength. The peak strength and elastic modulus of the rock-coal-rock combination gradually decrease with the increase of the interface dip angle. The research results overcome the shortcomings of assuming coal as homogeneous body in previous numerical simulation, and can provide a reference for further exploring the influence of coal structural plane development on the mechanics and failure characteristics of rock-coal-rock combination.

关 键 词:岩-煤-岩组合体 结构面发育 数值模拟 单轴压缩 力学及破坏特性 

分 类 号:TD313[矿业工程—矿井建设]

 

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