基于不同本构模型下的白砂岩动态力学性能仿真分析与实验验证

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中图分类号：0347.3 国标学科代码：13015 文献标志码：A

Abstract：The dynamic mechanicalproperties of deprocksare critical to understanding geologicalprocesses andoptimizing resource extraction.Acurately understanding the dynamic mechanical properties ofdeep rocks not only provides insights into the geologicalprocessesandevolutionoftheearth'sinterior，butalsoofersatheoreticalbasisfortheefectiveextractionof deepmineralsandenergy.Inthisstudy，thedynamicmechanicalbehaviorof whitesandstone fromacoal mine was experimentallndumericallyaldderuaial，baxial，andtaxialstessconditios.Numecalulatiossdon threeconstitutive modelsconsistingof theRiedel-Hermaier-Thoma （RHT）model，theHolmquist-Johson-Cook （HJC）model， andthecontinuoussurfacecapmodel （CSCM），were validated byusing experimentalresults from three-dimensional Hopkinsonbarexperiments.Theresultsindicate thattheshearfailuredamageofwhitesandstone specimens decreases withthe increasing prestress，withtriaxialstressconditionsyielding significantlylowerdamagethanuniaxialorbiaxial conditions. Among thethreemodels，theRHTconstitutivemodel demonstratestheclosestagreement withtheexperimentalresults in terms of stresswaveforms， peak stress，peak strain，anddamage degree.Compared with the experimental data， the RHTmodel exhibits a stress peak deviation ratio of 3.5% and 13.6% forthe reflected wave under uniaxial and biaxial conditions， respectivelywhiletestresspeakdeviationatioforthetrasmitedwaveisthelowest.Aditionall，thepeakstresadstrain values predicted by theRHT modelare numerically closer to the experimental results.The damage state predicted by the RHT model alsoalignswellwiththeexperimentalobservations：underuniaxial loading，thedamage exhibitsa U-shapedpattem， whereas the HJC model showed a larger V-shaped damage paternand fracture，and the CSCMmodel displayed surface damage with asmaller afected area. In terms of energy absorptionand dissipation，the simulation results based onthe three constitutivemodelsshowsminimaldiferences.Theincident，reflected，andtransmitedenergyvaluesarenearlyidentical across allthree models.Inaddition，thedamage degreeof the whitesandstone specimens increases with the impact velocity. Thedamage simulationresultsof the threeconstitutive modelsalsoshowan increasing trend with the impact velocity，while retaining the damage characteristics.

Keywords：deeprock;constitutive modelofrocks; dynamic mechanical properties; dynamics simulation;thre-dimensional Hopkinson bar experiment

深部资源开采与利用过程中的共性科学基础是深部岩石力学理论，准确掌握深部岩石动态力学性能，不仅有助于深人理解地球内部的地质演化过程，还可为深部矿产、能源的有效开采提供关键信息。（剩余22326字）