考虑接触损伤效应的衬砌渠道冻胀过程数值模拟方法

Numerical simulation of frost-heave process in lining canals considering contact behaviors of damage effects

位于寒冷地区的衬砌渠道易受冻害破坏,其破坏形式与衬砌结构以及结构和渠基土的相互作用有关。为使数值模拟中尽可能反映衬砌与渠基土的冻结-剪切-损伤效应,在考虑切向摩擦行为的基础上,引入一种接触面黏滞行为表征法向冻结作用力,并给出了有关参数的设置方法。数值计算结果表明,设置接触面黏滞行为能反映衬砌板与冻土之间的滑移变形及破坏准则。在此基础上,进一步探讨了整体式和装拼式衬砌渠道的冻胀特征。

The lining canals in cold regions are vulnerable to frost injury,and its failure mode is related to the structure and interaction between the linings and the ground soils.In order to simulate that interaction,the method of"cold expansion and heat contraction"is used to reflect the normal freezing stress.Based on this,the setting method for simulating the parameters is given.The numerical results show that a sliding deformation and failure criterion between the lining slabs and the frozen soils can be reflected by setting the viscous behaviors of contact surface.Based on the above studies,the frost-heave characteristics of monolithic and fabricated lining canals are discussed.