动载作用下砂岩变形速率及能量毫秒级模拟研究  

Study of deformation rate of sandstone under dynamic loading and energy millisecond simulation

作　　者：刘杰[1] 胡静[1] 李建林[1] 唐亮[1] 范留军 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《岩土力学》2014年第12期3403-3414,共12页Rock and Soil Mechanics

基　　金：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金项目(No.IWHR-SKL-2012221);省自然科学基金一般项目(No.2011CDB182);宜昌市科学技术研究与开发项目(No.A2012-302-03);公益性行业科研专项(No.201401029);三峡大学青年拔尖人才培育计划(No.KJ2014H012)

摘　　要：以中国科学院武汉岩土力学研究所研制的RMT-150C岩石力学试验系统为主要试验平台,以宜昌砂岩为研究对象,对砂岩在96 k N峰值、不同频率、不同波形加载下的垂向力变化速率、垂向变形速率、表观弹性模量、横向变形速率、瞬时泊松比与时间的关系等5方面内容进行分析得出不同频率、不同波形对上述关系的影响规律。在提出非滞后时间段内表观弹性模量与垂直力线性关系的基础上,给出不同频率下三角波和正弦波的计算公式及参数,计算和实测对比证明,其计算公式可以很好地拟合不同波形、不同频率下的变形速率随时间的毫秒级变化规律。在此基础上,给出了三角波和正弦波的能量计算方法,对比分析显示,计算公式和方法可以很好地对三角波和正弦波在不同频率和不同加载速度下的能量值作出毫秒级的精确预测。Taking RMT-150C rock mechanics testing system developed by Institute of Rock and Soil Mechanics, Chinese Academy of Sciences as the main test platform, five aspects of sandstone in the 96 kN peak with different frequencies and wave loadings in Yichang are studied： relationship between vertical force change rate and time, relationship between vertical deformation rate and time, relationship between apparent elastic modulus and time, relationship between the lateral deformation rate and time, relationship between instantaneous Poisson＇s ratio and time. Influence of different frequencies and waveforms on the relationships above is drawn.On the basis of putting forward the linear relationship between the non-lag period of apparent tangent modulus and vertical force, calculation formulas and parameters of the triangular wave and sine wave are obtained in different frequencies. The comparison of the calculation and measured values shows that the proposed calculation formulas can be well fitted with the changes rule with milliseconds of the deformation rate of different waveforms and different frequencies. On this basis, the paper gives the triangle and sine wave energy calculation methods, and comparative analysis shows that the listed computing formula and method can make accurate prediction of millisecond on the triangle and sine wave at different frequencies and energy value of different loading rates.

关 键 词：岩石力学 非滞后时间段 频率 三角波 正弦波 毫秒级模拟 

分 类 号：TU443[建筑科学—岩土工程]