路堤荷载下横观各向同性地基固结特性参数分析

采用各向异性弹性有限元法,系统分析了弹性各向异性参数特别是水平方向上的参数(水平向模量Eh,水平向泊松比νhh和剪切模量Ghv)取值对路堤荷载作用下地基固结特性的影响,包括地基中心沉降、地基水平位移、地基中的孔压消散以及平均固结度。研究结果表明:Eh的变化对路堤的沉降(特别是固结沉降)、路基的瞬时水平位移、孔压生成和消散以及总体平均固结度的影响显著;νhh的变化对路堤的固结沉降有显著影响;Ghv的变化对路堤的沉降、水平位移影响显著,而对孔压、总体平均固结度结果基本没有影响。

PARAMETER ANALYSIS OF THE CONSOLIDATION BEHAVIORS OF CROSS-ANISOTROPIC SUBGRADE UNDER EMBANKMENT LOADING

Using the cross-anisotropic elastic Finite Element Method, this paper systematically analyzes the influence of the parameter values of Eh (young’s modulus in the horizontal direction), νhh (Poisson’s ratio for horizontal strain due to horizontal strain at right angles) and Ghv (shear modulus in the vertical plane) on the consolidation behaviors of subgrade under embankment loads. These behaviors include the settlement of embankment center, horizontal displacement in subgrade, pore pressure dissipation and average consolidation degree in subgrade. Results indicate that the variation of Eh has significant influence on the results of settlement, horizontal displacement, pore pressure dissipation and total average consolidation degree. The variation of νhh has apparent influence on settlement, long term horizontal displacement and total average consolidation degree, but little influence on pore pressure. The variation of Ghv is of significant influence on settlement, horizontal displacement, but little influence on pore pressure and total average consolidation degree.