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《Geology and Exploration》 2017-05
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Test of Effects of Strain Rate on Mechanical Properties of Rock

CHEN Le-qiu;CHEN Jun-hua;ZHANG Jia-sheng;Department of Construction & Engineering,Hunan Institute of Science and Technology;School of Civil Engineering,Central South University;  
Uniaxial compressive tests of basalt were carried out under low-medium strain rate loading. The effects of strain rate on mechanical parameters,including compressive strength,elastic modulus and Poisson's ratio,were analyzed based on the test results,and the fitting relationships between those mechanical parameters and strain rate aere proposed respectively. The stain corresponding to the peak stress and the softening modulus were used as the two indexes for evaluating the brittleness of rock. The results obtained by the tests show that as follows:( 1) Both the uniaxial compressive strength and the elastic modulus increase with the strain rate.( 2) The Poisson's rate decreases with the strain rate.( 3) With the increase of strain rate,the staincorresponding to the peak stress increases,while the rock mechanical properties of strain softening and brittleness become weak.( 4) The influences of the strain rate on the uniaxial compressive strength are great,while the influences on both the elastic modulus and the Poisson's rate are small.( 5) The results of curve fitting are good,and the proposed relationships for fitting curves are reasonable.
【Fund】: 国家自然科学基金资助项目(51308210)资助
【CateGory Index】: TU45
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