大理岩加载力学性质与能量特征研究  

Study of Mechanical Properties and Energy Features of Marble under Loading Conditions

作　　者：刘天为[1] 陈春祺[1] 于芷婧[1] 

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《水电能源科学》2011年第9期65-67,218,共4页Water Resources and Power

摘　　要：利用典型大理岩试件进行了加载条件下的系列三轴试验,计算了大理岩在加载条件下的力学与变形参数,研究了岩样加载下变形破坏及其能量特征。结果表明,在加载试验中,随初始围压的增加,抗剪断参数凝聚力值增长,内摩擦角值降低;岩样在加载过程中,随轴向应力的增大,泊松比不断提高,并在破坏时急剧增长,变形模量初始变化平缓,但在岩样加载屈服破坏点处陡降;围压对岩样的变形破坏具有约束作用,限制了岩石内部裂纹的扩展及发育。A series of tri-axial tests of typical marble samples under loading conditions are implemented to analyze mechanical properties and deformation parameters.At the same time,deformation failure and energy properties are studied.The results show that in the loading experiments,shear strength parameter increases and angle of internal friction decreases with initial confining pressure increasing;during the loading experiments,with axial stress increasing Poisson＇s ratio rises up continually and it increases rapidly at the failure point while deformation modulus varies slowly,but at the failure point,it decreases rapidly;the confining pressure has restriction effect on deformation and failure of marble samples,which restrains expansion and development of rock internal cracking.

关 键 词：岩石力学 大理岩 加载试验 变形参数 力学参数 能量特征 

分 类 号：TU458.3[建筑科学—岩土工程]