Page 175 - 《水资源与水工程学报》2022年第1期
P. 175

!33 " ! 1 #                       & ' ( ) & * + , -                               Vol.33No.1
               2022 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2022

            DOI:10.11705/j.issn.1672-643X.2022.01.24


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                  (1. 4¡82 ÙÐSTR*È2U, Æ' '¡ 710054;2. '¡YS82 /´STGHÁ, Æ' '¡ 710048)
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               ?@A: É)x; 6´; ÈsÏ¿¤Ç; ÍL*‡; J•Ž‡
               BCDEF:TV698   GHIJK:A    GLMF:1672643X(2022)01017107

                          Experimentalstudyonengineeringcharacteristicsofloess
                                        reinforcedbyPSinKarezsidewall

                                 1
                                              1
                                                                   1
                                                                                   2
                                                                                               1
                         ANPeng,ZHUShilei,QIANGChengcheng,WANGSonghe,XUQiang
                         (1.SchoolofGeologicalEngineeringandGeomatics,Chang’anUniversity,Xi’an710054,China;
                          2.InstituteofGeotechnicalEngineering,Xi’anUniversityofTechnology,Xi’an710048,China)
               Abstract:Sidewallspallingcausedbyfreeze-thawcyclesistheinitialstageandmainformofKarezfail
               ure.Inordertoexploretheengineeringcharacteristicsofhighmoduluspotassiumsilicate (PS)reinforced
               sidewall ,frostheaveandstrengthtestsofPSmodifiedKarezloessafterfreeze-thawcycleswerecarried
               out.TheresultsshowthatPScansignificantlyincreasetheinitialfrostheavingwatercontent,andgreatly
               reducethefrostheavingamountofthesoilsamples,butthefrostheavingamountdoesnotdecreasewiththe
               increaseofPScontent,mainlybecausethelocationofporewaterchangeswiththeincreaseofPScontent.
               WiththeincreaseofPScontent ,theshearstress-straincurvetransitsfromhardeningtosoftening.Atthe
               sametime,thecurvebeforeyieldpresentsthetransitioncharacteristicsofupwardconvextoapproximatelin
               eartodownwardconvex,whichindicatesthatthesoiltexturegraduallychangesfromfrictiontypetosolidi
               fiedtype.WiththeincreaseofPScontent,thepeakstrengthofthesamplesincreasessignificantly,among
               whichthecohesionincreasesgreatly,becausetheinternalfrictionangledecreaseswiththeincreaseofPS
               content.3% PScontentisfeasibleinrestrainingfrostheaveandstrengtheningsidewallforKarez.There
               searchresultshavecertaintheoreticalandpracticalsignificanceforthereinforcementofKarezsidewall.
               Keywords:Karez;loess;highmoduluspotassiumsilicate(PS);antifrostheave;strengthcharacteristics

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