岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2015年
2期
320-324
,共5页
软黏土%次固结应变%压力%正常固结%超固结%流变模型
軟黏土%次固結應變%壓力%正常固結%超固結%流變模型
연점토%차고결응변%압력%정상고결%초고결%류변모형
soft soil%secondary consolidation strain%pressure%normal consolidation%over consolidation%rheological model
软土的次固结对于软土的变形量非常重要。在软土次固结计算中，通常以次固结系数作为计算参数，但该系数不能反映荷载变化的影响，而且只适用于正常固结土。由于工程中所遇到的大都为超固结土，对超固结土的次固结计算还缺少合理的方法。通过室内试验开展了软土次固结沉降相关研究，进行了多组原状软土试样的分级加载次固结试验，试验结果表明，对于软土次固结计算，建议从次固结应变与时间关系的角度，采用双曲线形式进行拟合，并分别对正常固结和超固结状态的次固结应变参数进行分析，建立了一维次固结的经验模型公式，提出了一种考虑压力对次压缩影响的次固结沉降计算方法，并将该方法应用于现场工程项目，验证了该方法可以适用于正常固结土和超固结土，使得软土次固结沉降量的计算能够更好地反映实际工程问题。
軟土的次固結對于軟土的變形量非常重要。在軟土次固結計算中，通常以次固結繫數作為計算參數，但該繫數不能反映荷載變化的影響，而且隻適用于正常固結土。由于工程中所遇到的大都為超固結土，對超固結土的次固結計算還缺少閤理的方法。通過室內試驗開展瞭軟土次固結沉降相關研究，進行瞭多組原狀軟土試樣的分級加載次固結試驗，試驗結果錶明，對于軟土次固結計算，建議從次固結應變與時間關繫的角度，採用雙麯線形式進行擬閤，併分彆對正常固結和超固結狀態的次固結應變參數進行分析，建立瞭一維次固結的經驗模型公式，提齣瞭一種攷慮壓力對次壓縮影響的次固結沉降計算方法，併將該方法應用于現場工程項目，驗證瞭該方法可以適用于正常固結土和超固結土，使得軟土次固結沉降量的計算能夠更好地反映實際工程問題。
연토적차고결대우연토적변형량비상중요。재연토차고결계산중，통상이차고결계수작위계산삼수，단해계수불능반영하재변화적영향，이차지괄용우정상고결토。유우공정중소우도적대도위초고결토，대초고결토적차고결계산환결소합리적방법。통과실내시험개전료연토차고결침강상관연구，진행료다조원상연토시양적분급가재차고결시험，시험결과표명，대우연토차고결계산，건의종차고결응변여시간관계적각도，채용쌍곡선형식진행의합，병분별대정상고결화초고결상태적차고결응변삼수진행분석，건립료일유차고결적경험모형공식，제출료일충고필압력대차압축영향적차고결침강계산방법，병장해방법응용우현장공정항목，험증료해방법가이괄용우정상고결토화초고결토，사득연토차고결침강량적계산능구경호지반영실제공정문제。
The secondary consolidation of soft soil is very important for the deformation of soft soil. In the calculation of secondary consolidation of soft soil, the secondary consolidation coefficient is usually used as a calculation parameter, but this coefficient does not reflect the impact of variation for loading, and it can only apply to the normally consolidated clay. The over-consolidated clay is mostly encountered in many engineering projects. The laboratory experiments are conducted to study the secondary consolidation settlement of soft soil. The consolidation test is carried out on multiple sets of undisturbed soft clay samples. The test results show that for the calculation of secondary consolidation of soft soil, the secondary consolidation should be studied from the aspects of the strain and time; a hyperbolic form fitting is used; the strain parameters for the normally consolidated and over-consolidated soil are analyzed to establish a one-dimensional model of secondary consolidation of empirical formula. A secondary consolidation settlement calculation method is proposed considering the pressure effect on the secondary compression; the method is applied to the engineering project. It is validated that the method can be applied to the normally consolidated and over consolidated soil; it makes the consolidation of soft soil subsidence calculation more approaching the actual engineering problems.
