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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。
In view of the problems of high test cost and complicated process when using the dynamic triaxial test equipment to test the dynamic characteristics of coarse aggregate, a horizontal single shear test machine developed by ourselves was adopted to study the effects of coarse aggregate Dynamic shear modulus and dynamic damping ratio and other dynamic characteristics. The experimental results show that the dynamic shear modulus and dynamic damping ratio of coarse aggregate are related to the factors such as horizontal shear strain, initial vertical stress, shear rate and cycle number. The smaller the horizontal shear strain, the larger the initial vertical stress, the more the number of cycles. The larger the dynamic shear modulus, the smaller the dynamic damping ratio, and the smaller the dynamic damping ratio with the number of cycles, the lower the decreasing and increasing rate Small, eventually reaching convergence. The test results are similar to the results of the moving triaxial shear test. It can be concluded that the test of the dynamic behavior of coarse aggregate with a large horizontal cyclic single shear is feasible and reasonable.