摘要
岩石作为非均匀介质含有大量的微裂纹,在外载作用下裂纹会相互作用.本文基于岩石的翼状裂纹模型,考虑了正方形裂纹阵列和六边形裂纹阵列两种情况下裂纹的相互作用,利用裂纹的运动方程和加载方程,研究了动力加载下Ⅰ型裂纹之间的相互影响对于岩石动力行为的影响.通过数值分析,定量研究了不同裂纹密度对岩石动力变形和破坏过程的影响.结果表明,裂纹密度越大,裂纹的相互作用越强烈,破坏时加载强度越低,惯性引起材料的轴向附加应力越大.
Rock contains numerous cracks,which will interact mutually under the action of external loads.This research based on the wing crack model,the interaction of Mode I cracks is considered for square and hexagonal configurations of crack distribution,and the effect of crack interaction on rock dynamic behavior is studied.Using crack motion equation and loading equation,the effect of crack concentration on dynamic deformation and fracture is investigated numerically.Numerical results show that,the greater the crack density is,the more intensive the crack interaction is,the lower the failure strength is,and the greater the inertia-induced additional axial stress is.
作者
戚承志
夏晨
李晓照
屈小磊
QI ChengZhi;XIA Chen;LI XiaoZhao;QU XiaoLei(Beijing Advanced Innovation Center for Future Urban Design,Beijing International Scientific and Technological Cooperation Base of Construction of Urban Tranflc Infrastructure,School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2020年第2期107-115,共9页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(编号:51478027,51774018,51708018)
国家重点基础研究发展计划(973计划)(编号:2015CB57805)资助
