吉林大学学报（地球科学版）
吉林大學學報（地毬科學版）
길림대학학보（지구과학판）
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
6期
1960-1965
,共6页
王清%张奇%马玉飞%高郢%鲍硕超
王清%張奇%馬玉飛%高郢%鮑碩超
왕청%장기%마옥비%고영%포석초
红土%压实性%强夯%饱和度%广西
紅土%壓實性%彊夯%飽和度%廣西
홍토%압실성%강항%포화도%엄서
laterite%compaction characteristics%dynamic compaction%degree of saturation%Guangxi Province
红土是由原岩在湿热气候条件下经过红土化作用形成的具有高含水率、大孔隙比、较高强度和较低压缩性的一种特殊土。由于其特殊的工程地质性质形成了红土具有较大工后沉降的特性。目前，工程中普遍采用强夯的地基处理方法对其进行处理，对于夯后红土地基变形则通过现场监测结合室内试验的方法进行研究。笔者通过室内击实试验和击实后红土的高压固结试验，深入探讨影响红土击实效果和击实后压实性的主要因素，并对各影响因素进行影响机理分析。试验结果表明：红土的击实效果与击实功成正比，与黏粒质量分数、塑性指数、游离氧化铁质量分数成反比；击实后红土的压缩模量受含水率、干密度及饱和度等因素的综合影响，并且各因素的影响程度不尽相同；当含水率大于18%时，土体处于近饱和状态，含水率与干密度已经不能反映饱和红土的压实性了，即在实际的强夯工程上这种土的含水率不宜大于18%，否则会产生较大的工后沉降。
紅土是由原巖在濕熱氣候條件下經過紅土化作用形成的具有高含水率、大孔隙比、較高彊度和較低壓縮性的一種特殊土。由于其特殊的工程地質性質形成瞭紅土具有較大工後沉降的特性。目前，工程中普遍採用彊夯的地基處理方法對其進行處理，對于夯後紅土地基變形則通過現場鑑測結閤室內試驗的方法進行研究。筆者通過室內擊實試驗和擊實後紅土的高壓固結試驗，深入探討影響紅土擊實效果和擊實後壓實性的主要因素，併對各影響因素進行影響機理分析。試驗結果錶明：紅土的擊實效果與擊實功成正比，與黏粒質量分數、塑性指數、遊離氧化鐵質量分數成反比；擊實後紅土的壓縮模量受含水率、榦密度及飽和度等因素的綜閤影響，併且各因素的影響程度不儘相同；噹含水率大于18%時，土體處于近飽和狀態，含水率與榦密度已經不能反映飽和紅土的壓實性瞭，即在實際的彊夯工程上這種土的含水率不宜大于18%，否則會產生較大的工後沉降。
홍토시유원암재습열기후조건하경과홍토화작용형성적구유고함수솔、대공극비、교고강도화교저압축성적일충특수토。유우기특수적공정지질성질형성료홍토구유교대공후침강적특성。목전，공정중보편채용강항적지기처리방법대기진행처리，대우항후홍토지기변형칙통과현장감측결합실내시험적방법진행연구。필자통과실내격실시험화격실후홍토적고압고결시험，심입탐토영향홍토격실효과화격실후압실성적주요인소，병대각영향인소진행영향궤리분석。시험결과표명：홍토적격실효과여격실공성정비，여점립질량분수、소성지수、유리양화철질량분수성반비；격실후홍토적압축모량수함수솔、간밀도급포화도등인소적종합영향，병차각인소적영향정도불진상동；당함수솔대우18%시，토체처우근포화상태，함수솔여간밀도이경불능반영포화홍토적압실성료，즉재실제적강항공정상저충토적함수솔불의대우18%，부칙회산생교대적공후침강。
Laterite is a kind of special soil which was formed by the laterization in the condition of hot and humid climate with the characteristics of high moisture content,large void ratio,higher strength and lower compressibility. As its special engineering geological properties there will be a larger settlement after construction on the foundation of red soil.Nowadays,the dynamic compaction as a method of ground treatment is widely applied and the deformation of laterite foundation after construction is always studied by field monitoring combined with laboratory test.The main factors which affect the compaction effect and the compaction characteristics of the laterite after compaction are deeply discussed on the base of the compaction test and consolidation test in the laboratory.And the mechanism analysis of factors are made.The experimental results show that the compaction effect has related with the content of clay,the plastic index,the free iron oxide and the compaction effort.The more content of clay,the higher plastic index and the more content of the free iron oxide would lead the worse compaction effect.The compaction effect is also in proportion to the compaction effort.The compression modulus of laterite after compaction is affected differently by the factors such as moisture content,dry density and degree of saturation.When the moisture content of the laterite is greater than 18% and the degree of saturation is close to 100%.The moisture content and dry density can’t reflect the compaction characteristics.Hence,in practical engineering the moisture content of the laterite shuold not be greater than 18% to avoid the larger settlement.
