基于横观各向同性冻土的U形渠道冻胀数值模拟

Numerical Simulation of Frost Heaving for U Canal Based on Transverse Isotropy

将冻土分别视为各向同性和横观各向同性线弹性材料,把渠基冻土和渠道衬砌作为一个整体结构,视基土冻胀为热胀冷缩的特殊情况,应用大型有限元通用软件ANSYS,对U形混凝土衬砌渠道冻胀进行热应力耦合数值模拟,计算渠道冻胀的温度场、应力场和变形场,研究衬砌板冻胀力和变形规律,并对结果进行对比分析.结果表明,数值模拟方法能较好地反映U形混凝土衬砌渠道的冻胀机理和冻胀温度场、应力场及变形场的基本规律,横观各向同性比各向同性更能反映冻土的本构模型,与实测成果吻合更好,可用于U形混凝土衬砌渠道抗冻胀设计.

Regarding the frozen soil as isotropic elastic material and the transverse isotropic respectively,integrating that in canal base and canal lining,FEM software ANSYS would be applied to process heat stress coupling simulation of frost heaving for U-shape canal with concrete lining in the case of considering the frost heaving as the thermal expansion especially,in order to get the size and distribution of field for its temperature,deformation,stress and analyse them.The results showed that the numerical simulation method could better reflect characteristics of frost heaving for U-shape canal with concrete lining,the transverse isotropic as more accurate constitutive model could accord with measured achievements better compared with the isotropic to serve design of anti-frost heaving for U-shape canal with concrete lining consequently.