基于点荷载的砂岩单轴抗压和抗拉强度估算

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

LIU Yongzhi'，FANGQingyao²， 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

在工程实践中，单轴抗压和抗拉强度被认为是表征岩石材料力学特性的关键参数，可直接通过试验得到，但其岩样制备过程复杂、成本高。（剩余7970字）