【摘要】：軟黏土中滲流存在起始水力坡降的現(xiàn)象已逐漸為人們所認識,但變荷載下考慮起始坡降的軟土大變形非線性固結(jié)理論還很鮮見�？紤]土中滲流存在的起始水力坡降及非線性壓縮滲透特性,在拉格朗日坐標系中建立變荷載下以超靜孔壓為變量的軟土大變形非線性固結(jié)模型并給出其有限差分解。在此基礎(chǔ)上,通過與達西定律下大變形固結(jié)半解析解對比分析,驗證了解的可靠性。最后著重分析起始水力坡降對軟土大、小變形固結(jié)性狀影響的差異。結(jié)果表明,無論采用小變形假定還是采用大變形假定,考慮起始坡降后超靜孔壓的消散速率及最終沉降量均比達西定律下小。大、小變形假定下起始坡降均會引起超靜孔壓不能完全消散的現(xiàn)象,且大變形假定下超靜孔壓殘留值要小于其小變形假定下的殘留值,致使大變形假定下土層最終沉降量要比其小變形假定下大。起始水力坡降和幾何變形假定均會影響固結(jié)性狀,且起始坡降值無疑影響更明顯,故在軟黏土中滲流存在的起始水力坡降在固結(jié)計算中不容忽視。
[Abstract]:The phenomenon of initial hydraulic gradient in seepage flow in soft clay has been gradually recognized, but the nonlinear consolidation theory of large deformation of soft soil considering initial slope under variable load is still rare. Considering the initial hydraulic gradient and nonlinear compression seepage characteristics of seepage in soil, a nonlinear consolidation model of soft soil with large deformation under variable load is established in Lagrangian coordinate system and its finite difference decomposition is given. On this basis, the reliability of the solution is verified by comparing it with the semi-analytical solution of large deformation consolidation under Darcy's law. Finally, the effect of initial hydraulic slope on the consolidation behavior of soft soil with large and small deformation is analyzed. The results show that the dissipation rate and the final settlement of the excess pore pressure after considering the initial slope are smaller than those under Darcy's law, regardless of the assumption of small deformation or large deformation. Under the assumption of large deformation and small deformation, the initial slope drop will lead to the phenomenon that the excess static pore pressure can not dissipate completely, and the residual value of the excess static pore pressure under the large deformation assumption is smaller than the residual value under its small deformation assumption. As a result, the final settlement of soil layer under the assumption of large deformation is larger than that under the assumption of small deformation. Both the initial hydraulic gradient and the geometric deformation assumption will affect the consolidation behavior, and the initial gradient value is undoubtedly more obvious, so the initial hydraulic gradient existing in the seepage flow in soft clay can not be ignored in the consolidation calculation.
【作者單位】： 江蘇大學土木工程與力學學院;浙江大學濱海和城市巖土工程研究中心;
【基金】：國家自然科學基金項目(No.51109092,No.11272137) 中國博士后基金項目(No.2013M530237,No.2014T70479) supported by the National Natural Science Foundation of China(51109092,11272137) the Foundation for Post-doctoral Scientists of China(2013M530237,2014T70479)
【分類號】：TU447;TU433

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