疏浚泥一维大应变固结的一种预测方法
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摘要
为合理反映高含水率疏浚泥的一维大应变固结性状,基于Xie固结方程简化解析解,提出了考虑压缩参数分段线性变化的一种大应变固结预测方法。通过室内大尺寸沉降柱模型试验,分析了高含水率疏浚泥在自重应力和低外加荷载状态下的大应变固结特性,探讨了Xie计算方法的适用性,并明确了理论结果与室内实测值的差别。研究结果表明:高含水率疏浚泥在低外加荷载作用下,应变量超过20%,运用一维大应变固结理论分析其固结性状更为准确;合理的选择固结参数是预测疏浚泥沉降的关键所在,保持体积压缩系数为常量的沉降计算值与实测值差别较大,考虑压缩参数分段线性变化的固结预测结果与实测值较为吻合,提出的预测方法可以应用到堆场吹填和围海造陆工程中。
For reasonably reflect one-dimensional large strain consolidation character of dredged sludge at high water content,based on simplified analytical solution of the large strain consolidation theory by Xie, we proposed a method of predicting large strain consolidation considering piecewise linear variation of compression parameters, performed laboratory tests in large-scale settling column to investigate the characteristic of dredged sludge at high water content under gravity stress and low external loading, discussed the applicability of the calculation method by Xie, and investigated the difference between theoretical results and laboratory-measured values. The results show that the deformation of dredged sludge at high water content is more than20% under the effect of low external loading, and the analysis of consolidation behavior is more accurate by one-dimensional large strain consolidation theory. The reasonable selection of consolidation parameters is the key to predict the settlement. The calculated values of settlement with constant volume compression coefficient is different from the measured value, the consolidation prediction results considering piecewise linear variation of compression parameters are in good agreement with the measured value. This proposed method can apply to the yard and land reclamation project.
For reasonably reflect one-dimensional large strain consolidation character of dredged sludge at high water content,based on simplified analytical solution of the large strain consolidation theory by Xie, we proposed a method of predicting large strain consolidation considering piecewise linear variation of compression parameters, performed laboratory tests in large-scale settling column to investigate the characteristic of dredged sludge at high water content under gravity stress and low external loading, discussed the applicability of the calculation method by Xie, and investigated the difference between theoretical results and laboratory-measured values. The results show that the deformation of dredged sludge at high water content is more than20% under the effect of low external loading, and the analysis of consolidation behavior is more accurate by one-dimensional large strain consolidation theory. The reasonable selection of consolidation parameters is the key to predict the settlement. The calculated values of settlement with constant volume compression coefficient is different from the measured value, the consolidation prediction results considering piecewise linear variation of compression parameters are in good agreement with the measured value. This proposed method can apply to the yard and land reclamation project.
引文
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[2]CARGILL K W.Prediction of consolidation of very soft soil[J].Journal of Geotechnical Engineering,1984,110(6):775-795.
[3]GIBSON R E,ENGLAND G L,HUSSEY M J L.The theory of onedimensional consolidation of saturated clays:I.Finite nonlinear consolidation of thin homogeneous layers[J].Geotechnique,1967,17(3):261-273.
[4]CARTER J P,SMALL J C,BOOKER J R.A theory of finite elastic consolidation[J].International Journal of Solids and Structure,1977,13(5):467-478.
[5]PREVOST J H.Nonlinear transient phenomena in saturated porous media[J].Computer Methods in Applied Mechanics and Engineering,1982,30(1):3-18.
[6]CHOPRA M B,DARGUSH G F.Finite-element analysis of timedependent large-deformation problems[J].International Journal for Numerical and Analytical Methods in Geomechanics,1992,16(2):101-130.
[7]MIKASA M,TAKADA N,OSHIMA A,et al.Nonlinear consolidation theory for non-homogenous clay layer and its application[J].Journal of the Japanese Geotechnical Society Soils&Foundation,1998,38(4):205-211.
[8]TAN T S,SCOTT R F.Finite strain consolidation-A study of convection[J].Infection&Immunity,2008,28(3):64-74.
[9]GIBSON R E,SCHIFFMAN R L,CARGILL K W.The theory of one-dimensional consolidation of saturated clays:II.Finite nonlinear consolidation of thick homogeneous layers[J].Canadian Geotechnical Journal,1981,18(3):280-293.
[10]XIE K H,LEO C J.Analytical solutions of one-dimensional large strain consolidation of saturated and homogeneous clays[J].Computers and Geotechnics,2004,31(4):301-314.
[11]HONG Z S,YIN J,CUI Y J.Compression behaviour of reconstituted soils at high initial water contents[J].Géotechnique,2010,60(9):691-700.