徐州高铁站石灰岩尺度效应单轴压缩试验研究
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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。
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.
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.
引文
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[2]Hudson J A,Crouch S.Soft,stiff and servo-controlled testingmachines[J].Eng.Geol,1972,6(3):155～159.
[3]尤明庆,邹友峰.关于岩石非均质性与强度尺寸效应的讨论[J].岩石力学与工程学报,2000,19(3):391～395.
[4]尤明庆,华安增.岩样单轴压缩下的尺度效应和矿柱支撑性能[J].煤炭学报,1997,22(1):37～41.
[5]尤明庆,苏承东.大理岩试样的长度对单轴压缩试验的影响[J].岩石力学与工程学报,2004,23(22):3753～3760.
[6]郭志.实用岩体力学[M].北京:地震出版社,1996,21～25.
[7]潘一山,魏建明.岩石材料应变软化尺寸效应的试验和理论研究[J].岩石力学与工程学报,2002,21(2):215～218.
[8]杨圣奇,苏承东,徐卫亚.岩石材料尺寸效应的试验和理论研究[J].工程力学,2005,22(4):112～117.
[9]杨友卿.岩石强度的损伤力学分析[J].岩石力学与工程学报,1999,18(1):23～27.
[10]刘宝琛,张寄生,杜寄中.岩石抗压强度的尺寸效应[J].岩石力学与工程学报,1998,17(6):611～614.
[11]郭中华,朱珍德,杨志祥等.岩石强度特性的单轴压缩试验研究[J].河海大学学报,2002,20(2):225～229.
[12]倪振强,孔纪名,阿发友等.碎石土古滑坡的开挖扰动效应及稳定性研究[J].工程勘察,2012,(5):5～10.
[13]张平松,李永盛,杨华忠.硬岩深孔爆破破坏范围地震波CT测试[J].工程勘察,2012,(5):36～39.
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