(1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. CCCC Road and Bridge Consultants Co.，Ltd.，Beijing 100011，China；3. Department of Hydraulic and Hydropower Engineering，Tsinghua University，Beijing 100084，China；4. AVIC Geotechnical Engineering Institute Co.，Ltd.，Beijing 100098，China)
Abstract：The static and quasi-dynamic tests on granite specimens under various strain rates are conducted by using rock dynamic loading system. The specimens are 50 mm in diameter，with the length of 50，75，100，125 mm，respectively. The research results are drawn as follows：(1) Specimen strength is significantly dependent on strain rates and increases with the growth of strain rates with a power relationship. (2) Under static and quasi-dynamic loading conditions，rock strength generally decreases with the increase in specimen length. (3) When the diameter of specimen is 50 mm，the aspect ratio should be not smaller than 2；then steady test results can be obtained under different strain rates. (4) Peak strain under each strain rate decreases with increasing specimen size. (5) Both of secant modulus E50 and elastic modulus Et increase with increasing specimen size；and Et is larger than E50. (6) Failure mode is significantly dependent on strain rates and failure is serious when the strain rate increases. When strain rate ＜10－3 s－1，failure mode has a process of split failure-taper failure-shear failure；when strain rate ＞10－2 s－1，the failure mode changes from taper failure to shear failure directly.
梁昌玉1，李 晓1，张 辉2，李守定1，赫建明1，马超锋3，4. 中低应变率范围内花岗岩单轴压缩特性的尺寸效应研究[J]. 岩石力学与工程学报, 2013, 32(3): 528-536.
LIANG Changyu1，LI Xiao1，ZHANG Hui2，LI Shouding1，HE Jianming1，MA Chaofeng3，4. RESEARCH ON SIZE EFFECT OF UNIAXIAL COMPRESSION PROPERTIES OF GRANITE UNDER MEDIUM AND LOW STRAIN RATES. , 2013, 32(3): 528-536.
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2013, Vol. 32 
