粗粒料水平循环单剪动力特性试验研究
|
摘要
针对利用动三轴试验设备进行粗粒料动力特性试验时存在试验成本高和工序复杂等问题,采用自主研发的水平向单剪试验仪,通过大型水平循环单剪试验,研究了粗粒料的动剪切模量和动阻尼比等动力特性。试验结果表明,粗粒料的动剪切模量、动阻尼比与水平剪应变、初始竖向应力、剪切速率和循环数等因素有关。水平剪应变越小,初始竖向应力越大,循环数越多,动剪切模量越大,动阻尼比越小,且动阻尼比随循环数的增多,其减小和增长速率均变小,最终达到收敛。试验结果与动三轴剪切试验结果规律类似,可见采用大型水平循环单剪仪进行粗粒料动力特性试验研究可行、合理。
For the problems of high cost and complex process by using the dynamic triaxial test apparatus for the dynamic characteristics of coarse-grained materials,the independent research and development of horizontal simple shear test apparatus has been adopted.Through the horizontal cyclic simple shearing tests,dynamic properties of coarse-grained materials,such as dynamic shearing modulus and dynamic damping ratio,are studied.Tests show that the dynamic shearing modulus and dynamic damping ratio are affected by shearing strain,vertical stress,shearing speed and number of cycles.The higher the vertical stress is,the bigger the dynamic shearing modulus is;the bigger the number of cycles is,the bigger the dynamic shearing modulus is;the smaller the shearing strain is,the bigger the dynamic shearing modulus is.As the increment of the number of cycles,the rate of the dynamic damping ratio decreases;finally,it reaches a stable value.The laws of the results are similar to those of dynamic triaxial shear tests.Therefore,it is feasible and reasonable to do the research on the dynamic properties of coarse-grained materials by using the horizontal cyclic simple shearing tests.
For the problems of high cost and complex process by using the dynamic triaxial test apparatus for the dynamic characteristics of coarse-grained materials,the independent research and development of horizontal simple shear test apparatus has been adopted.Through the horizontal cyclic simple shearing tests,dynamic properties of coarse-grained materials,such as dynamic shearing modulus and dynamic damping ratio,are studied.Tests show that the dynamic shearing modulus and dynamic damping ratio are affected by shearing strain,vertical stress,shearing speed and number of cycles.The higher the vertical stress is,the bigger the dynamic shearing modulus is;the bigger the number of cycles is,the bigger the dynamic shearing modulus is;the smaller the shearing strain is,the bigger the dynamic shearing modulus is.As the increment of the number of cycles,the rate of the dynamic damping ratio decreases;finally,it reaches a stable value.The laws of the results are similar to those of dynamic triaxial shear tests.Therefore,it is feasible and reasonable to do the research on the dynamic properties of coarse-grained materials by using the horizontal cyclic simple shearing tests.
引文
[1]Evans M D,Zhou S.Liquefaction Behavior of Sandgravel Composites[J].Journal of Geotechnical Engineering,ASCE,1995,121(3):287-298.
[2]杨贵,刘汉龙,任青文.粗粒料动三轴试验颗粒流模拟对称性研究[J].世界地震工程,2010,26(S1):36-40.
[3]朱晟,周建波.粗粒筑坝材料的动力变形特性[J].岩土力学,2010,31(5):1 375-1 380.
[4]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[5]顾淦臣,沈长松,岑威钧.土石坝地震工程学[M].北京:中国水利水电出版社,2009.
[2]杨贵,刘汉龙,任青文.粗粒料动三轴试验颗粒流模拟对称性研究[J].世界地震工程,2010,26(S1):36-40.
[3]朱晟,周建波.粗粒筑坝材料的动力变形特性[J].岩土力学,2010,31(5):1 375-1 380.
[4]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[5]顾淦臣,沈长松,岑威钧.土石坝地震工程学[M].北京:中国水利水电出版社,2009.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心