水平荷载作用下横观各向同性地基力学性态研究

STUDY ON MECHANICAL BEHAVIOUR OF TRANSVERSLY ISOTROPIC FOUNDATION UNDER HORIZONTAL LOADS

根据横观各向同性体各向同性面为水平时的本构方程,推导出了横观各向同性面倾斜时的本构方程,并由此得出了横观各向同性地基的自重应力计算公式以及在各种水平荷载作用下地基中的附加应力解析解。通过实例计算,发现横观各向同性地基与各向同性地基力学性态的差异之处,并从自重应力角度较好地解释了水平应力大于竖直应力和水平应力的各向异性的重要实测现象,得出了一些有益于工程设计的结论。

Based on the constitutive equation of a transversely isotropic foundation with horizontal isotropic symmetric planes,the constitutive equation for a transversely isotropic foundation with inclined isotropic symmetric planes is derived. In addition,the methods of computing earth stress of a transversely isotropic foundation under the above two conditions and the analytical solutions of additional stress caused by horizontal loads are developed. From practical examples,the differences in the mechanical behaviour between a transversely isotropic foundation and an isotropic foundation are found. The study result can also be applied to explain the phenomena of larger horizontal stresses compared with the vertical ones and anisotropic horizontal stresses as observed in practice.