Xianbiao Mao, . THE EFFECTS OF DIFFERENT UNLOADING RATES ON ROCK STRENGTH[J]. MECHANICS IN ENGINEERING, 2009, 31(6): 21-24. DOI: 10.6052/1000-0879-2008-407
Citation: Xianbiao Mao, . THE EFFECTS OF DIFFERENT UNLOADING RATES ON ROCK STRENGTH[J]. MECHANICS IN ENGINEERING, 2009, 31(6): 21-24. DOI: 10.6052/1000-0879-2008-407

THE EFFECTS OF DIFFERENT UNLOADING RATES ON ROCK STRENGTH

  • By using MTS series 815.02 model servo-controlled stiffrock mechanics testing system, the stress-strain characteristicsof the sandstone specimen were studied in unloading process under tri-axialcondition with different unloading rates. The relation between strength and unloadingrate was analyzed and a formula was obtained.The fracture mechanism in unloading process was studied by observing thecrack characteristics. The findings can provide sometheoretical reference for engineering practice when analyzing the rock massunloading problems.
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