工程地质学报
工程地質學報
공정지질학보
2015年
4期
668-674
,共7页
非饱和残积土%土水特征曲线%土体内部结构%SWCC滞后性%修正 VG模型
非飽和殘積土%土水特徵麯線%土體內部結構%SWCC滯後性%脩正 VG模型
비포화잔적토%토수특정곡선%토체내부결구%SWCC체후성%수정 VG모형
Unsaturated residual soil%SWCC%Soil internal structure%SWCC hysteresis%Improved VG model
利用压力板仪装置开展不同竖向应力、不同干湿循环次数和不同类型原状土（残积黏性土和残积砂质黏性土）的SWCC曲线试验研究，比较和分析未考虑体积变化和考虑体积变化的土体 SWCC滞回圈面积以及进气值和出气值的变化规律。研究结果表明传统方法获取的 SWCC曲线会高估土体抵御变形的能力，试验条件变化引起土体内部结构调整是 SWCC曲线发生变化的内在原因；高应力水平条件下，土体孔隙变化显著，导致吸湿过程 SWCC变化明显，吸湿和脱湿路径时 SWCC形状的不平等变化促使彼此间更为接近，这种变化会减小 SWCC滞后性随有效应力水平的变化。最后，根据试验数据对3类SWCC修正公式进行拟合优度分析，结合模型参数的简洁性，得出修正 VG模型最符合闽东南地区原状残积土的 SWCC建模。研究成果可为残积土边坡的工程特性及治理提供有意义的参考。
利用壓力闆儀裝置開展不同豎嚮應力、不同榦濕循環次數和不同類型原狀土（殘積黏性土和殘積砂質黏性土）的SWCC麯線試驗研究，比較和分析未攷慮體積變化和攷慮體積變化的土體 SWCC滯迴圈麵積以及進氣值和齣氣值的變化規律。研究結果錶明傳統方法穫取的 SWCC麯線會高估土體牴禦變形的能力，試驗條件變化引起土體內部結構調整是 SWCC麯線髮生變化的內在原因；高應力水平條件下，土體孔隙變化顯著，導緻吸濕過程 SWCC變化明顯，吸濕和脫濕路徑時 SWCC形狀的不平等變化促使彼此間更為接近，這種變化會減小 SWCC滯後性隨有效應力水平的變化。最後，根據試驗數據對3類SWCC脩正公式進行擬閤優度分析，結閤模型參數的簡潔性，得齣脩正 VG模型最符閤閩東南地區原狀殘積土的 SWCC建模。研究成果可為殘積土邊坡的工程特性及治理提供有意義的參攷。
이용압력판의장치개전불동수향응력、불동간습순배차수화불동류형원상토（잔적점성토화잔적사질점성토）적SWCC곡선시험연구，비교화분석미고필체적변화화고필체적변화적토체 SWCC체회권면적이급진기치화출기치적변화규률。연구결과표명전통방법획취적 SWCC곡선회고고토체저어변형적능력，시험조건변화인기토체내부결구조정시 SWCC곡선발생변화적내재원인；고응력수평조건하，토체공극변화현저，도치흡습과정 SWCC변화명현，흡습화탈습로경시 SWCC형상적불평등변화촉사피차간경위접근，저충변화회감소 SWCC체후성수유효응력수평적변화。최후，근거시험수거대3류SWCC수정공식진행의합우도분석，결합모형삼수적간길성，득출수정 VG모형최부합민동남지구원상잔적토적 SWCC건모。연구성과가위잔적토변파적공정특성급치리제공유의의적삼고。
The stressdependent pressure plate extractor system is used to study the residual soil SWCC curve ofdifferent vertical stresses,drying and wetting cycles and different types of natural residual cohesive soil and residualsandy clay.Then the laws of SWCC hysteresis loop area with and without volume change and AEV and AexV ofresidual soils are analyzed and compared.Results show that not only the ability of soil to resist deformation can beoverestimated by the traditional method of SWCC curve,but also the underlying cause of SWCC curve changing isdue to soil internal structure change constantly;Meanwhile,the higher net stress levels are ,the larger size poresare much more influenced by the net stress.Thus the wetting branch is much more affected.The observed unequalchange in the shape of drying and wetting branches of SWCC at higher net stress values brings them close to eachother,and reduces the SWCC hysteresis as the net stress level increasing.Finally,according the simplicity of model parameters and the goodness-of fit analysis results of the 3 kinds of improved SWCC models,the improved VGmodel has been found to be the most suitable model for all SWCC of the natural residual soil in southeast of Fujian.The above research is useful and meaningful as reference for the engineering characteristics and governance of theresidual slope.
