摘要
为研究不同组合条件下煤岩组合体的力学特性及破坏过程,使用RFPA^(2D)软件,采用位移加载方式,对不同倾角、围压下的煤岩组合体进行数值模拟,研究单轴和三轴条件下不同煤岩组合体的破坏机制,分析了围压、倾角对煤岩组合体强度的影响.研究表明:单轴压缩时煤岩组合体的强度接近煤体的单轴破坏强度.三轴压缩时煤岩组合体的强度随着倾角的增大先缓慢降低后迅速降低.围压越大组合体强度越高,但强度提高值随着围压的增大降低.煤岩组合体的内摩擦角随着倾角的增大减小,内聚力随着倾角的增大均先增大后减小.组合体单轴压缩破裂情况基本相同,破坏基元主要分布于煤体中,三轴压缩时组合体的破裂出现了3种情况.
To study the dynamic properties and failure process of coal-rock combination body,the RFPA^（2D） is used to test different coal-rock combination bodies with different inclined angles and confining pressures under deformation loading.By the tests the failure mechanisms of coal-rock combination bodies under the uniaxial compression test and the tri-axial compression test are obtained.The influence of confining pressures and inclined angles on the coal-rock combination body strength is analyzed.The study results show that the strength of coal-rock combination bodies is close to the strength of the coal under the uniaxial compression test.Under the tri-axial compression test,the strength of the coal-rock combination body decreases with the increase of inclined angles.And the strength of coal-rock combination bodies drops slowly at first and then reduces rapidly.The strength of coal-rock combination bodies increases with the higher confining pressure,but the improved strength decreases with the increase of confining pressure.The internal friction angle of coal-rock combination bodies decreases with the increase of inclined angles. The cohesion of coal-rock combination bodies increases at first and then decreases.In uniaxial compression tests the fracture is similar and the failure primitives are concentrated in the coal.In the tri-axial compression test,there are three conditions in the fracture.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2016年第2期132-139,共8页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(51264018
51064012)
关键词
RFPA2D数值模拟
煤岩组合体
破裂形式
破坏强度
RFPA2D numerical simulation
coal-rock combination body
fracture mode
failure strength
