摘要
为研究岩石损伤特性与矿物颗粒之间的关系,对三种不同粒径石英砂组成的类岩石材料进行单轴压缩试验,分析类岩石材料力学特性;基于等价应变原理,建立不同粒径类岩石材料损伤本构方程,分析各粒径类岩石材料破裂过程损伤演化特性。研究结果表明:理论损伤本构方程和试验结果基本吻合。在0.1~1 mm粒径范围内,类岩石材料的单轴抗压强度、峰值变形比能与其内部粒径大小组成具有一定的关系:粒径越大,单轴抗压强度和峰值变形比能越小;试样在单轴压缩过程中,粒径越大,峰值应力前损伤值越大,峰值应力后粒径越小,损伤值增长越快,破坏越突然。
To study the relationship between rock damage characteristics and mineral particles in deepth,this paper studies the uniaxial compression tests of three kinds of rock materials with different particle sizes(0.1~0.2 mm,0.2~0.5 mm,0.63~1 mm).Based on the mechanical properties of three kinds of rock materials,the damage constitutive equations are constructed by combining the damage mechanics principle.The research results show that the theoretical damage constitutive equation and the experimental results are coincided;compressive strength,peak deformation energy of simulated rock material influenced by its internal particle size composition,the greater the particle size,the greater the compressive strength and peak deformation energy ratio;specimen under the uniaxial compression,the larger particle size,the initial damage are greater before the peak stress;after the peak stress,the smaller the particle size is;the damage increases faster and specimen breaks down more suddenly.
作者
郑小龙
赵奎
曾鹏
龚囱
廖鑫
ZHENG Xiaolong;ZHAO Kui;ZENG Peng;GONG Cong;LIAO Xin(College of resources and environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;KeyLaboratoy of Mining Engineering of Jiangxi Province,Ganzhou 341000,Jiangxi,China)
出处
《中国钨业》
CAS
2018年第1期49-53,共5页
China Tungsten Industry
基金
国家自然科学基金资助项目(51664018)
江西省主要学科学术和技术带头人培养计划(20153BCB22004)
关键词
类岩石材料
损伤
变形比能
粒径
simulated rock material
damage
peak deformation enegy
particle sizes
