考虑动态拉压比影响的岩石损伤本构模型

打开文本图片集

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

岩石是矿业工程、土木工程和防护工程等领域中广泛涉及到的脆性材料，在这些领域中岩石经常受到爆炸和冲击等动载作用，岩石将不可避免地承受高压和高应变率[1]。（剩余16967字）