拼装式铝道面板下土基变形预测模型

Predictive Model of Subgrade Deformation Beneath Aluminum Sandwich Panel

为了分析飞机重复荷载作用时拼装式道面板下土基塑性变形情况,对4种不同厚度、强度的蜂窝铝夹芯道面板进行了足尺通行加载试验,测试了土基在不同轮载作用次数下的塑性变形.通过数据拟合分析确定了特定铝道面板下土基变形关于通行次数及基层强度的简化模型.对简化模型进行修正后,将新模型与其他传统预估模型进行了对比,结果表明:土基变形与通行次数的对数成正比例关系,与土质道面强度成反比例关系,道面板D铺设在高强度基层上时,道面板的疲劳开裂是道面结构失效的主要原因;道面板D铺设在70 MPa的基层上时,采用沥青道面设计公式、美军土质道面设计公式、本文推导公式分别计算得出的最大通行次数为4.07×1013、288、487 990次.

In order to study the subgrade deformation beneath the sandwich panel which was subjected to repeated aircraft load, four aluminum honeycomb sandwich panels with different thickness and strength were trafficked and the soil plastic deformation was surveyed. The performance data were analyzed and presented graphically to build a simple predictive model including traffic times and base strength. The simplify model was revised and compared with conventional models. The results show that the soil deformation is in proportion to the logarithm of times, and inversely proportional to base strength. Fatigue cracking is the main failure reason of pavement structures. The maximum traffic times calculated by three different design equations are 4.07 × 10^13 , 258, and 487 990 respectively when pavement D is installed over the soil with 70MPa strength.