紅樹林河口段之土壤性質及改良

《紅樹林河口段之土壤性質及改良》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、紅樹林河口段之土壤性質及改良TheSoilPropertiesoftheEstuarywithMangroveHabitatanditsImprovement中華大學土木工程學系中華大學土木工程學系副教授碩士班研究生楊朝平洪國森Chau-PingYangKuo-ShengHong摘要「就地取材」為生態工法之大原則，而紅樹林河口段之土層為含砂、粉、粘之土壤，其飽和度高、孔隙比大、承載力低、壓密沉陷量大等，土壤性質不佳。為兼顧防洪及保護紅樹林，以生態工法施做河防構造物最適宜，而河道土壤調查乃工法設計之大根本。為此，本研究以苗栗縣竹南鎮射流溝之河口段為對象，調查該區河道之土壤性質，並建議改良

2、方法。該河道土壤分類屬CL類土（砂質粉粘土）、含水量約為30.8%、孔隙比0.81、完全飽和、壓縮指數0.229。其有機物含量2.35%、=8.3，可藉由夯實及土壤水泥技術改良其工程性質，宜將其含水量控制在8%~23%範圍內。無圍壓縮強度於夯實試體為157、於土壤水泥試體（水泥含量12%）為1,066，內摩擦角於不擾動試體為10.3、於夯實試體為33.3、於土壤水泥試體為57.0，知曉夯實及土壤水泥技術之改良成效佳。土壤水泥試體內雖含12%之水泥，但其組成仍接近土，植物尚可生長。關鍵辭：紅樹林河口段、土壤性質、夯實、土壤水泥。AbstractOneoftheprincipalofthe

3、ecologicalconstructionmethodis“fullutilizationoffieldmaterials.”However,thestratumoftheestuarywithmangrovehabitatissoftandinsaturationstate,withhighconsolidationsettlementandlowbearingcapacity.Theecologicalconstructionmethodsaresuitableforthetargetsoffloodcontrolandpreservingmangrove.Itisnecessa

4、rytosurveythevariouspropertiesofsoilsofmangrovehabitatinordertoassemblesuperiorconstructionmethods.Therefore,thisstudysurveyedthepropertiesofstratumintheestuaryoftheSirlyuRiver,Miao-LiCounty.Then,thesurveyedsoilwillbeimprovedtentativelybythemethodsofcompactionandsoil-cement.Thesurveyedsoilisclas

5、sifiedasCLanditsgroupnameissandysiltwithclay.Themoisturecontent,voidratioandcompressionindexoftheundisturbedsoilare30.8%,0.81and0.229respectively.Thecontentoforganicmaterialsand-valueinthesurveyedsoilare2.35%and8.3respectively.Accordingly,itisabletojudgethatthesurveyedsoilcouldbeimprovedbythemet

6、hodsofcompactionandsoil-cementundertheconditionofcontrollingitsmoisturecontentintherangeof8%~23%.Theunconfinedcompressionstrengthsforcompaction’sspecimenandsoil-cement’sspecimenwith12percentofcementcontentare157and1,066respectively.Theinternalangleoffrictionoftheundisturbedsoilis10.3.Whereas,the

7、valuesofofthecompactedspecimenandsoil-cement’sspecimenare33.3and57.0respectively,thesevaluesareratherhigherthantheoneoftheundisturbedsoil.Though,thesoil-cement’sspecimencontains12percentofcementbutitsnatureisstilllikeasoilan