基于板底脱空的水泥混凝土道面结构理论分析

Theory Analysis of Cement Concrete Pavement Structure Based on Existence of Disengaging Under Slab

摘要:

地基的不均匀沉降将使水泥混凝土道面处于不利受力状态，当板下产生脱空时，板在自重作用下将产生相当于恒载的附加应力，影响道面结构的疲劳寿命.针对盾构穿越机场水泥混凝土道面导致板底脱空的现象，构建了自重作用下水泥混凝土道面板底脱空的力学模型，并利用板壳力学有关理论推演了面层板的应力和挠度公式

关键词:脱空; 水泥混凝土道面; 不均匀沉降; 应力; 挠度

Abstract:

Differential settlement of foundation will result in adverse state of cement concrete pavement, additional force is induced by self weight while existing disengaging under slab and fatigue life of pavement is affected. Mechanical model of existence of disengaging under slab is established under self weight and formula of stress and deflection of slab are derived by related theory of plate and shells based on existence of disengaging under slab induced by the shield driving method.

Key words:disengaging; cement concrete pavement; differential settlement; stress; deflection