文章编号:1007-2993(2023)04-0465-05黄土原位钻孔剪切试验研究黄晓维1刘子君2杨振荣1郑建国1(1.机械工业勘察设计研究院有限公司,陕西西安710043;2.中联西北工程设计研究院有限公司,陕西西安710077)【摘要】准确获得黄土原位土体抗剪强度参数对黄土工程至关重要。将钻孔剪切试验应用于西安某黄土滑坡原位土体抗剪强度参数测试,提出了黄土场地中适宜的成孔方法,在原Iowa钻孔剪切仪基础上加装微型位移测量系统和剪切力测量系统,精确测量法向位移与剪切应力,并将钻孔剪切试验结果与室内直剪试验结果进行了对比。结果表明,改进后的设备测试更加可视化、可控化;试验阶段法向压力–位移分布近似在一条直线上,土体处于似弹性变形阶段;首级法向压力固结时间为10min,后续每级压力固结时间为5min,满足试验要求并能保证试验成功率;与室内直剪试验相比,钻孔剪切试验测得的内摩擦角平均大40.8%,黏聚力平均小12.7%。钻孔剪切试验数据之间相关性较好,测试效果良好,可为今后黄土原位土体抗剪强度参数测试提供借鉴与指导。【关键词】钻孔剪切试验;法向压力;固结时间;黄土【中图分类号】TU413【文献标识码】Adoi:10.3969/j.issn.1007-2993.2023.04.016ResearchofIn-situBoreholeShearTestofLoessHuangXiaowei1LiuZijun2YangZhenrong1ZhengJianguo1(1.ChinaJikanInstituteofEngineeringInvestigationandDesignCo.,Ltd.,Xi’an710043,Shaanxi,China;2.ChinaUnitedNorthwestInstituteforEngineerDesign&ResearchCo.,Ltd.,Xi’an710077,Shaanxi,China)【Abstract】Itisveryimportanttoaccuratelyobtainthein-situshearstrengthparametersofloessforloessengineering.Inthisstudy,boreholesheartest(BST)wasappliedtotesttheshearstrengthparametersofloessonaloesslandslideinXi'an.Thesuitabledrillingmethodinloesssitewasproposed,andamicrodisplacement-shearstrengthmeasurementsystemwasaddedonthebasisoftheoriginalIowaboreholesheartesttoaccuratelymeasurethenormaldisplacementandshearstress.TheresultsofBSTanddirectsheartestwerecompared.Theresultsshowthattheimprovedequipmentismorevisibleandcontrollable;thenormalstressisproportionaltodisplacement,whichindicatesthatthesoilisinthestageofquasielasticdeformation.Toensurethereliabilityoftheresults,thetimeforconsolidationunderthefirststageofnormalstressneeds...