【摘要】 通过徐州高铁站采集的石灰岩样,利用岩石力学试验机对不同截面和不同高度的石灰岩柱试件进行了大量的单轴压缩试验,研究了不同高细比岩样的单轴抗压强度、弹性模量、极限变形模量与极限应变量的变化规律。研究结果表明:单轴抗压强度随着高细比的增加呈σ=160.79exp(-0.3218λ)指数规律递减;弹性模量与极限变形模量均随着高细比的增加呈E=aLn(λ)+b对数规律增加,并随着高细比的增大受静、动荷载的性能都有所降低;极限应变量ε随着高细比λ的增加呈ε=aλ-b幂函数规律减小。研究结果对岩石力学工程设计参数的选取具有一定的参考意义。更多还原

【Abstract】 Through the limestone specimens connected at Xuzhou high-speed rail station and by using the rock mechanics testing machine,the specimens with the different section and different height are tested with the large amounts of uniaxial compression tests.The change rules of the uniaxial compressive strength,elastic modulus,ultimate deformation modulus and limit strain are studied for the rock specimens with different height-slenderness ratios.The test results show that: the uniaxial compressive strength will decrease in the index diminishing law σ=160.79 exp(-0.3218λ) with the increase of the high-slenderness ratio;the elastic modulus and limit deformation modulus will increase in the logarithm law E=aLn(λ)+b with the increase of the high-slenderness ratio and the performance of the static and dynamic loads will reduce;the limit strain ε will decrease in the power function law ε=aλ-b with the increase of the high-slenderness ratio λ.The study results could give the significant reference for the selection of the parameters in engineering design.更多还原