岩体轴向抗压强度与变形尺度效应的节理分布影响  

JOINT DISTRIBUTION EFFECT ON AXIAL COMPRESSIVE STRENGTH AND DEFORMATION SCALE EFFECTS OF ROCK MASSES

作　　者：王谦源[1] 栗东平[2] 魏晋龙 

机构地区：[1]青岛理工大学理学院,山东青岛266033 [2]河北工程大学土木工程学院,河北邯郸056038 [3]甘肃省电力设计院,甘肃兰州730050

出　　处：《岩石力学与工程学报》2008年第9期1852-1857,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：重庆大学教育部西南资源开发及环境灾害控制工程重点实验室资助项目

摘　　要：采用相似模拟材料,用预置硫酸纸模拟试件节理,研究5种分形节理岩体的轴向抗压强度和变形的尺度效应,获得同一尺度下岩体强度和变形随节理分形维数变化的试验数据。在分析强度与变形受尺度和节理分布维数单因素影响规律的基础上,建立二维影响关系经验公式。试验结果表明,岩体强度和变形模量均随尺度和节理分形维数的增加而降低,泊松比则随尺度和分形维数增加而增加;试件破坏的总体规律是随尺度和节理分形维数增加,岩石的延性增加,但破坏过程与方式受节理分布的控制。The axial compressive strength and deformation scale effect of five kinds of rock masses with fractal joints are studied by using the similar materials and the simulating block joints are prepared with vitriol paper. The experimental data of compressive strength and deformation changing with the joint fractal dimension for the same scale have been obtained, and two-dimensional empirical equations are developed based on the analyses of the experimental data. The experimental results indicate that the compressive strength and deformation modulus of rock masses decrease with the increase of scale and the joint fractal dimension; but the Poisson＇s ratio increases with the increase of scale and the joint fractal dimension. It can be generally concluded that the rock ductility increases with the increase of scale and the joint fractal dimension; and the damage process and form are controlled by the joint distribution dimension.

关 键 词：岩石力学 岩体强度 岩体变形 尺度效应 相似材料 分形节理 

分 类 号：TU45[建筑科学—岩土工程]