不同高径比时软岩强度与变形尺寸效应试验研究  

Size effect experimental study of strength and deformation in different height-to-diameter ratio soft rocks

作　　者：陈瑜[1] 黄永恒[1] 曹平[1] 衣永亮[1] 李娜[1] 李丽娟[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2010年第3期1073-1078,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50774093;10972238);中南大学研究生学位论文创新选题资助项目(134377237;2009ssxt229)

摘　　要：对2组直径约为50mm、高径比为1～2、岩性分别为贫矿和白云石大理岩的岩石样本,通过单轴压缩试验,对其尺寸效应进行研究对比。结果表明:岩石应力-应变关系曲线的曲率随高径比的增大而增大;岩石的变形模量和弹性模量随高径比的增大而呈现非线性增大;在小高径比时岩石的破裂形式较复杂,在大高径比时,呈劈裂破坏和剪切破坏;岩石的抗压强度随高径比的增大呈增大趋势。The lean ore and dolomite marble rock samples with the same diameter （about 50 mm） and the ratio of height to diameter （1-2） were studied. The uniaxial compression tests were carried out on a servo-controlled testing machine,and the size effect was compared. The results show that the curvature of stress-strain curves increases with the increase of the ratio of height to diameter. The rock＇s deformation modulus and elastic modulus increase nonlinearly with the increase of the ratio of height to diameter. The failure of rock specimens with small ratio of height to diameter is quite complex,but it shows as splitting failure and shear failure with high ratio of height to diameter. The compressive strength increases with the increase of the ratio of height to diameter.

关 键 词：岩石力学 尺寸效应 强度 高径比 破裂形式 

分 类 号：TU458.3[建筑科学—岩土工程]