本文選題：雙層地基　切入點：非達西滲流　出處：《巖土力學(xué)》2016年08期 　論文類型：期刊論文

【摘要】：現(xiàn)有的雙層軟土地基大變形固結(jié)理論均假定土中滲流遵循達西定律,但軟黏土中滲流在低水力坡降下會出現(xiàn)偏離達西定律的現(xiàn)象已逐漸為人們認識。綜合考慮雙層軟黏土中的非達西滲流、軟土的非線性壓縮滲透特性及實際中的變荷載作用,在拉格朗日坐標系中建立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,通過與已有的非達西定律下單層地基大變形固結(jié)數(shù)值解計算結(jié)果相對比,以驗證其差分解的可靠性。最后著重分析上、下層非達西滲流參數(shù)m_1、i_(11)及m_2、i_(12)對固結(jié)性狀的影響,并分析了在大、小變形不同幾何假定下對雙層地基超靜孔壓消散及固結(jié)沉降影響的異同。結(jié)果表明:上層土參數(shù)m_1、i_(11)對固結(jié)性狀的影響要比下層土參數(shù)m_2、i_(12)顯著;m_2、i_(12)的增大會引起上層土超靜孔壓消散速率的加快,但雙層地基的固結(jié)速率會減慢;大變形假定下雙層軟土地基的固結(jié)速率要比小變形假定下快,但兩種幾何假定下雙層地基的最終沉降量是相等的。
[Abstract]:The existing consolidation theory of large deformation of double-layer soft soil foundation assumes that the seepage in soil obeys Darcy's law. However, the phenomenon that seepage in soft clay deviates from Darcy's law under low hydraulic gradient has been gradually recognized. Considering the non Darcy seepage in double layer soft clay, the nonlinear compressive permeability of soft clay and the effect of variable load in practice are considered. In Lagrangian coordinate system, a nonlinear consolidation model for large deformation of soft soil is established, in which the excess pore pressure is taken as a variable, and its finite difference decomposition is given. The reliability of the differential decomposition is verified by comparing the results with the numerical solution of large deformation consolidation of single-layer foundation under non-Darcy 's law. Finally, the influence of non-Darcy percolation parameters m1i _ (11) and m _ 2i _ (12) on the consolidation behavior is analyzed. And analyzed in the big, The effects of different geometric assumptions of small deformation on the dissipation of excess static pore pressure and consolidation settlement of double-layer foundation are similar and different. The results show that the effect of the upper soil parameter m _ 1 / I _ (11)) on consolidation behavior is more significant than that of the lower soil parameter m _ 2i _ (12) (m _ 2i _ I _ (12)) and the increase of the upper layer will result in the increase of the upper layer. The acceleration of dissipation rate of soil excess pore pressure, But the consolidation rate of double-layer foundation will slow down, the consolidation rate of double-layer soft soil foundation is faster than that of small deformation assumption, but the final settlement of double-layer foundation is equal under two geometric assumptions.
【作者單位】： 江蘇大學(xué)土木工程與力學(xué)學(xué)院;浙江大學(xué)濱海和城市巖土工程研究中心;
【基金】：國家自然科學(xué)基金項目(No.51109092) 中國博士后基金面上項目(No.2013M530237);中國博士后基金第七批特別資助項目(No.2014T70479)~~
【分類號】：TU447

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