文章编号:1673-5196(2023)01-0127-09稻壳灰改良盐渍土力学特性及抗冻性的研究丑亚玲*,韩航天(兰州理工大学土木工程学院,甘肃兰州730050)摘要:在西北季节冻土区广泛分布着盐渍土,其在空间分布上连续性差,工程性质极其不稳定;且浅层盐渍土受冻融作用的反复影响,其力学性质长期处于动态的变化之中,给工程设计与建设带来了极大的挑战.鉴于此,通过压缩试验及无侧限抗压强度试验,研究稻壳灰对盐渍土的改良效果.结果表明,稻壳灰可以显著地改善盐渍土的压缩特性,并提高其无侧限抗压强度,且改良土的压缩系数与抗压强度之间呈现出负相关的线性关系.随着掺灰量和养护龄期的增加,改良土的压缩系数不断减小,无侧限抗压强度呈现出不断增加的趋势,最大可增加4倍左右.以抗压强度损失率为指标对改良土的抗冻性进行了评价,发现改良土的抗冻性随着掺灰量的增加呈现出先增强后减弱的趋势,且在15%的掺灰量时,其抗冻性效果最显著;相对而言,养护龄期对于改良土的抗冻性影响较小.关键词:盐渍土;稻壳灰;压缩试验;无侧限抗压强度试验;抗冻性中图分类号:TU411文献标志码:AExperimentalstudyonmechanicalpropertiesandfreezingresistanceofricehuskashimprovedsalinesoilCHOUYa-ling,HANHang-tian(SchoolofCivilEngineering,LanzhouUniv.ofTech.,Lanzhou730050,China)Abstract:SalinesoiliswidelydistributedintheseasonalfrozensoilareaofNorthwestChina,whichhaspoorcontinuityinspatialdistributionandextremelyunstableengineeringproperties.Moreover,theme-chanicalpropertiesofshallowsalinesoilareindynamicchangesforalongtimeduetotherepeatedinflu-enceoffreezingandthawing,whichbringsgreatchallengestoengineeringdesignandconstruction.Inviewofthis,throughtheconsolidationcompressiontestandtheunconfinedcompressivestrengthtest,theim-provementeffectofricehuskashonchloridesalinesoilwasstudied.Theresultsshowthatricehuskashcansignificantlyimprovethecompressivepropertiesofsalinesoilandincreaseitsunconfinedcompressivestrength,andthereisanegativelinearrelationshipbetweenthecompressioncoefficientandcompressivestrengthofimprovedsoil.Withtheincreaseofricehuskashandcuringage,thecompressioncoefficientoftheimprovedsalinesoilcontinuestodecrease,andtheunconfinedcompressivestrengthshowsanincreas-ingtrend,whichcanbeincreasedb...
