基于點荷載的砂巖單軸抗壓和抗拉強度估算

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Estimation of Uniaxial Compressive Strength and Tensile Strength of Sandstone Based on PointLoad

LIU Yongzhi'，F(xiàn)ANGQingyao2， ZHANG Kun'，YAO Huayan2，LIUWu2，LIU Guang2 （1.He'anHigpeedlwayCo，Ld，Hefei3，ina;2.CollgeofCivilEnging，HefeiUnversityofcologei 230009， China）

Abstract：Inrockmechancsandengineeringpractice，acurateandrapidevaluationofuniaxialcompresivestrengthandtesile strengthofrockisimportantforengineeringdesignandconstructionsafety.Traditionaltestmethodsaretime-consumingand laborious，andthemethodofdeterminingunaxialcompresivestrengthandtensilestrengthofockbypointloadstregthidexis simpleandfast.Inthispaper，thepointloadtestuniaxialcompressietest，ndBraziliansplitingtestunderdryondiioswere cariedoutbasedonl1diferenttypesofsandstone，andtherelationshipofthepointloadstrengthwithcompressivestrgthand tensilestrengthwasestablishedbydiferentftigmethds.Teresultsshowthathepontoadstrengthofsandstonehasasignificant corelationwithcompressivestrengthandtensilestrength，andthevariationcoeficientsoftetwopointloadstrengthshvelitle diference，whichcanbeusedastheindexforcalculating thepointloadstregthThreediferenttypesoftransformationrelatioships canbeusedtofitthontloadandiaxialompressiestrengthcludingon-intereptlinarrelatioship，Ontercptlir relationshipndpoerfunctio.TelearfitingmedisspletalulatendteoetioncoeentoflinarftihO interceptishigherthanthatoflinearfitigwithnon-Ointercpt.BoththepowerfunctionfitingformulaandtheOinterceptfiting formulacanbeusedtoestimatetheunaxialompresivestrengthinpracticalengineering.Forthetensilestrengthitisalso

advantageoustouse theO intercept linearformulaforestimation eywords： sandstone; experimental research; point load strength; linear fiting; power function fittin

在工程實踐中，單軸抗壓和抗拉強度被認為是表征巖石材料力學特性的關(guān)鍵參數(shù)，可直接通過試驗得到，但其巖樣制備過程復(fù)雜、成本高。（剩余7970字）