Study On Rate Effect of Uniaxial Compression Test for Red Sandstone
Received date: 2017-01-05
Revised date: 2017-03-01
Online published: 2018-05-19
The uniaxial compression tests of homogeneous red sandstone under low loading （strain） rate range with different order of magnitude were carried out using hydraulic servo test machine.The effects of loading （strain） rate on the compressive strength，tangent elastic modulus and failure strain were investigated.The displacement control loading was adopted in the process of testing，and the loading rate were 0.12，1.2，12，120 mm/min respectively.The results show that there are good linear relationship among displacement control loading rate，actual loading rate and strain rate of specimen.The uniaxial compressive strength and tangent elastic modulus of rock materials increase with the loading rate under different loading rates，the uniaxial compressive strength increases by 11%，the tangent elastic modulus increases by 13%，and the rate effect is remarkable. It is also found that the failure strain is no associated with strain rate （loading rate） by experimental data，and there is no law of rate effect，so the strength criterion should be stress criterion instead of strain criterion.
WANG Jin , GONG Fengqiang . Study On Rate Effect of Uniaxial Compression Test for Red Sandstone[J]. Gold Science and Technology, 2018 , 26(1) : 56 -63 . DOI: 10.11872/j.issn.1005-2518.2018.01.056
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