摘要
基于颗粒流数值软件PFC^(3D)对砂岩进行了三轴压缩试验模拟,并与室内试验数据进行了对比分析,讨论了围压对砂岩承载过程中扩容行为和细观结构演化的影响。研究表明:砂岩的强度参数(扩容起始应力和峰值强度)和变形参数(轴向应变和环向应变)以及与围压的关系均可以采用正线性关系来表征,且岩石经过扩容转折点后,模型微裂隙数量开始剧增。
The triaxial compression test of sandstone is carried out by the rock mechanics test system,and simulate triaxial compression based on particle flow code software PFC3D. The influence of confining pressure on the dilatancy behavior and microstructure evolution of sandstone bearing process is discussed. The study have shown that: the relationship between confining pressure and strength parameters of sandstone(initial stress and peak strength), deformation parameters(axial strain and ring strain) and number of microcrackscan be characterized by positive linear relationship. After the dilatancy of the rock, the number of microcracks in the model began to increase dramatically.
作者
张文力
冯梅梅
吴疆宇
ZHANG Wen-li;FENG Mei-mei;WU Jiang-yu(State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)
出处
《煤炭技术》
CAS
2019年第3期23-25,共3页
Coal Technology
基金
国家自然科学基金青年基金项目(51404266)
关键词
扩容
围压
颗粒流
峰值强度
dilatancy
confining pressure
particle flow code
peak strength
