摘要
为研究不同煤岩组合体力学特性和声发射特征,利用RFPA2D数值模拟软件,对不同围压和不同组合倾角条件下的泥岩煤组合体,粉砂岩煤组合体及石灰岩煤组合体进行了模拟。结果表明,单轴压缩时不同煤岩组合体应力应变曲线相似,其峰值强度均接近煤体的单轴抗压强度;煤岩体强度随着组合体间倾角的增大而减小,煤岩体中岩体的强度越高,煤岩体越早出现强度的迅速衰减;煤岩组合体的内摩擦角随着组合体倾角的增大而减小,而内聚力随着倾角增大先增大后减小;随着围压的升高,煤岩组合体的声发射振铃计数最大值经历了一个先减后增的过程,组合体中岩石强度越高,声发射最大振铃计数值越高。
In order to study the mechanical properties and acoustic emission characteristics of different coal-rock combined bodies, the RFPA20 is used to simulate different combination modes include the rock and the combination inclined angle. Under different confining pressure, the mechanical properties and the AE characteristics are obtained. The results show that：the different samples have the similar uniaxial stress-strain curves and the peak strengths of the different coal-rock combined bodies are close to the strength of the coal. With the increasinz of the combination inclined angle, the greater of the rock strength, the earlier the strength of coal-rock combined bodies decay quickly. The internal friction angles of the coal-rock combined bodies reduce with the increasing of the combination angle, while the cohesions of the samples increase firstly and then decrease. With the increase of the confining pressure, the maximum AE ringing counting rates of the samples have experienced the process that decrease firstly and then increase. The maximum AE ringing counting rates of the samples have a positive correlation with the strength of the rock in the coal-rock combination bodies.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2016年第4期485-492,共8页
Journal of Nanjing University of Science and Technology
基金
国家自然科学基金(51264018
51064012)
关键词
煤岩组合体
数值模拟
力学特性
声发射
coal-rock combination body
emission characteristics numerical simulation
mechanical property
acoustic
作者简介
付斌（1992-），男，硕士生，主要研究方向：岩石力学，E—mail：fubinde@163．com；
通讯作者：周宗红（1967-），男，博士，教授，主要研究方向：采矿工程与岩石力学，E-mail：zhou20051001@163．com。
