CAJ | 학술논문

为解决不同应力水平下饱和软土层的沉降计算问题，考虑土的流变特性，对西原模型低应力分量进行了分析和改进。通过Laplace变换与反变换，得到了瞬时加载条件下改进西原模型的一维固结解析解，在此基础上采用积分的方法推导了多级加载条件下的统一解析解，并将解析解应用于洞庭湖软土路堤试验段的沉降计算。结果表明：该解析解沉降计算值在不同应力水平下呈现不同的变化规律，均与对应应力水平下的沉降实测值吻合。在固结初期，该解析解的计算固结沉降速率大大低于相同条件下弹性模型的计算结果。因此，在计算软基沉降时，必须考虑不同应力水平对软基沉降的影响，并考虑软土流变所引起的滞后效应。
위해결불동응력수평하포화연토층적침강계산문제，고필토적류변특성，대서원모형저응력분량진행료분석화개진。통과Laplace변환여반변환，득도료순시가재조건하개진서원모형적일유고결해석해，재차기출상채용적분적방법추도료다급가재조건하적통일해석해，병장해석해응용우동정호연토로제시험단적침강계산。결과표명：해해석해침강계산치재불동응력수평하정현불동적변화규률，균여대응응력수평하적침강실측치문합。재고결초기，해해석해적계산고결침강속솔대대저우상동조건하탄성모형적계산결과。인차，재계산연기침강시，필수고필불동응력수평대연기침강적영향，병고필연토류변소인기적체후효응。
In order to solve the settlement calculation problem of saturated soft soil under different stress levels,the low stress component of the Nishihara model was analyzed and improved after considering the rheological properties.Through the Laplace transform and its inverse transform,a one-dimensional consolidation analytical solution was obtained under instantaneous loading condition.Based on the solu-tion,the unified analytical solution was obtained in the method of integral under multilevel loading condi-tions.And the analytical solution was used in the settlement calculation for the test section of Dongting Lake Area soft soil embankment.It has been shown that the calculated settlement values of the analytical solutions under different stress levels have different change laws,which is in agreement with those of the field tests.At the early stage of consolidation,the calculated consolidation settlement rates are much lower than that of the elastic model under the same conditions.Therefore,when calculating the settlement of soft foundation,it is necessary to consider the influence of different stress levels on the settlement of soft foundation,and to consider lag effect caused by soft soil creep.