工程地质学报2017，Vol.25Issue(4)：935-942,8.DOI:10.13544/j.cnki.jeg.2017.04.006
硬脆性流纹岩变形分析的综合刚度法
COMPREHENSIVE STIFFNESS TECHNIQUE USED IN DEFORMATION ANALYSIS OF HARD AND BRITTLE RHYOLITE WITH FISSURES
摘要
Abstract
The closure,opening and propagation of internal fissures of natural rock under compressive load can affect the mechanical properties of rock directly.Based on the classical moving point regression technique,Poisson's ratio is introduced to propose the six stage division method which is called comprehensive stiffness technique (CST).The results of uniaxial compression test under different loading paths show the following.(1) Contact strain ε0,closure strain of cracks εc,elastic strain εe,stable crack propagation εi,unstable crack propagation εd and postpeak strain εf of hard and brittle rock can be achieved by the CST.(2)Under uniaxial compression test,the closure strain of cracks at 44.2％ of pre-peak strain is larger than the elastic strain of rhyolite.The pre-peak crack propagation strain and post-peak strain are all small.Actually the rhyolite is significantly brittle.(3) Loading and unloading test in elastic stage shows that the contact strain can be removed by comprehensive stiffness technique and the closure strain of cracks.The comprehensive stiffness technique is more suitable to the deformation analysis of hard and brittle rock,since it can remove the contact strain and achieve more accurate strain of different stages,especially the closure strain of cracks.These strains can be the quantitative parameters of the evaluation of crack density in rock.关键词
硬脆性流纹岩/综合刚度法/泊松比/接触应变/裂隙闭合应变/变形阶段Key words
Hard and brittle rhyolite/Comprehensive stiffness technique/Poisson's ratio/Contact strain/Closure strain of cracks/Deformation stages分类
建筑与水利引用本文复制引用
钟志彬,邓荣贵,吕蕾,张志伟,孙怡,付小敏..硬脆性流纹岩变形分析的综合刚度法[J].工程地质学报,2017,25(4):935-942,8.基金项目
国家自然科学基金项目(41272321),西南交通大学博士生创新基金,国家留学基金委(201507000052)资助. （41272321）
