单轴条件下层状盐岩的表面裂纹扩展分析  

Analysis of surface crack growth in layered salt rock under uniaxial compression

作　　者：李林[1] 陈结[1] 姜德义 杨春和[2] 刘春[3] 

机构地区：[1]重庆大学西南资源开发及环境灾害控制工程教育部重点试验室,重庆400044 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉430071 [3]重庆科技学院安全工程学院,重庆400042

出　　处：《岩土力学》2011年第5期1394-1398,共5页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973计划)(No.2009CB724606);国家创新研究群体基金(No.50621403)

摘　　要：利用荧光法和细观分析技术对单轴条件下层状盐岩表面裂纹扩展及分布进行了研究,并简要分析了国内外盐岩物理力学性质的差异。试验结果表明:纯盐岩表面裂纹以盐晶粒间错动裂纹为主,晶间裂纹扩展贯通形成破坏性主裂纹,裂纹分布受盐晶粒大小及分布均匀性的影响,国外细晶粒盐岩的强度和变形能力均大于国内粗晶粒纯盐岩;纯夹层表面裂纹多产生在几种矿物交杂沉积处,裂纹分布由夹层矿物成分和组成结构决定;含夹层盐岩表面裂纹扩展分布受夹层与盐岩界面过渡形式影响,一般锯齿型交界面裂纹由盐岩部分主裂纹向夹层扩展而成,而过渡分明并含有薄泥层的交界面裂纹由盐岩部分主裂纹和泥层碎散型裂纹汇集扩展而成。The surface crack growth and dispersion in layered salt rock under uniaxial compression are studied by fluorescence and mesomechanical techniques;the differences of physico-mechanical properties of salt rock at home and abroad are briefly analyzed.The experimental results show： for pure salt rock,the surface cracks are mainly sliding cracks between salt grains.Destructive macro cracks are shapes with expand and joint coalescence of cracks between salt grains which impacted by size and uniformity of distribution of salt grains,strength and deformation of salt rock grains abroad are greater than domestic salt rock.For pure intercalation salt rock,the surface crack grown at the mixture of several mineral deposits,and which distribution effected by interlayer mineral composition and structure.For laminated salt rock,the surface crack distribution is effected by form of interfacial transition between interlayer interface and salt rocks.Generally,the serrated cracks mainly form by the main crack expansion to interlayer;the cracks with transition clearly and containing a thin layer of mud form by main crack and mud layers loose cracks assemble and expanding.

关 键 词：层状盐岩 单轴压缩 荧光法 细观力学 表面裂纹 

分 类 号：TU45[建筑科学—岩土工程]