考慮動(dòng)態(tài)拉壓比影響的巖石損傷本構(gòu)模型
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Study on the damage constitutive model of rock considering the influence of dynamic ratio of tension to compression
HU Xuelong123， WANG Yixian3， YIN Zuoming4， ZHANG Ming1， GUO Panpan3， YIN Zhiqiang1， ZHANG Xiangyangl （1. Coal Mine Safety Mining Equipment Innovation Center of Anhui Province， Anhui University ofScienceand Technology，Huainan 232oo1，Anhui， China;
2.State Key Laboratory for Fine Exploration and Intelligent Development ofCoal Resources， ChinaUniversityofMiningand Technology，Xuzhou2211l6，Jiangsu，China;
3.CollegeofCivilEngineering，HefeiUniversityofTechnology，Hefei3ooo9，Anhui，China;
4.North Blasting Technology Co.，Ltd.，Beijing10oo89， China）
Abstract：Based on continuum damage mechanics，a rock dynamic constitutive model with coupled elastic-plastic damage wasestablished.Thismodeltooktheunifiedstrengththeoryastheyieldcriterionandintroducesthedynamictensilecompressiveratio tofullyreflect thestrainrate effect.The effective plastic strain and volumetric plastic strain were used to represent thecompressivedamage variable，andthe effective plastic strainwas used torepresent thetensiledamage Variable， therebyreflectingthe different damage evoution lawsofrocksunder tensileandcompresiveconditions.A piecewise function was adopted to describe the diferent plastic hardening behaviors of rocks under tensile and compressive conditions.The establishedconstitutivemodel wasnumericallyimplemented basedonFortranlanguageand theLS-DYNAusermaterial customizationinterface （Umat）.Theestablishedconstitutivemodelisverifiedbytreeclassicalcalculationexamplesamely theuniaxialandtriaxialcompressontestsofocks，teiaxialtesiletestofocks，ndteallstictestofocks.eults showed thatthis constitutive modelcan comprehensively describe the staticand dynamic mechanical behaviors of rocks.
Keywords：constitutive model; damage; ratio of tension to compression; strain rate
巖石是礦業(yè)工程、土木工程和防護(hù)工程等領(lǐng)域中廣泛涉及到的脆性材料，在這些領(lǐng)域中巖石經(jīng)常受到爆炸和沖擊等動(dòng)載作用，巖石將不可避免地承受高壓和高應(yīng)變率[1]。（剩余16967字）