考虑界面倾角及分形特性的组合煤岩体强度及破坏机制分析  

Failure mechanism and strength of coal-rock combination bodies considering dip angles and fractal characteristics of interface

作　　者：曹吉胜[1,2,3] 戴前伟 周岩[4] 马德鹏[5] 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学有色金属成矿预测教育部重点实验室,湖南长沙410083 [3]中国煤炭科工集团重庆研究院有限公司,重庆400037 [4]山东科技大学测绘科学与工程学院,山东青岛266590 [5]山东农业大学水利土木工程学院,山东泰安271018

出　　处：《中南大学学报（自然科学版）》2018年第1期175-182,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41374118);重庆市教委科技计划项目(KJ1732439);国家"十三五"重大专项(2016ZX05067-004-006;2016ZX05045-004-007)~~

摘　　要：为深入研究分界面对组合煤岩体力学行为的影响,设计25个不同界面分形维数及倾角的组合体试验模型,运用RFPA软件对其力学特征及破坏机制进行数值试验研究。计算结果分析表明:界面倾角及分形维数对组合体的破坏强度、破裂形式、弹性模量及损伤有明显的影响:随界面倾角增大,破坏强度逐渐降低,组合体的破坏形式由煤样内部剪切破坏逐渐转变为煤样分界面滑移破坏;随界面分形维数的增加,破坏强度与弹性模量均逐渐增大,并且界面倾角越大,界面分形特征对组合煤岩体弹性模量的影响程度越大;随着分形维数的增大,组合煤岩体的损伤值逐渐降低,两者呈上凸形二次曲线的函数关系,且分形维数越大,损伤值降幅也越大。In order to furtherly study the mechanical behavior of coal-rock combination bodies influenced by the interface, 25 test models of different fractal dimensions and dip angles of interface was designed, and the numerical experiments of mechanical characteristics and failure mechanism were carried out by using RFPA. The calculation results show that the dip angles and fractal dimensions of interface have obvious effect on the breaking strength, rupture mode, elastic modulus and damage of combination bodies. Breaking strength gradually decreases with the increase of dip angle of interface. Failure mechanism of combination bodies changes from shear failure to slip failure. The breaking strength and elastic modulus gradually increases with the increase of fractal dimension of interface, and the greater the dip angle, the greater the effect of the fractal characteristics of interface on the elastic modulus of combination bodies becomes, but the damage of combination bodies gradually decreases with the increase of fractal dimension, and the greater the fractal dimension is, the greater the amplitude of the damage value of combination bodies decreases.

关 键 词：分形维数 组合煤岩体 倾角 破坏机制 损伤 

分 类 号：TD322[矿业工程—矿井建设]