机场道面地基参数的识别与转换

Identification and Conversion of Foundation Parameters for Airport Pavement

提出了一种机场道面地基参数识别与转换的新方法.应用最小二乘方准则,通过实测挠度与理论挠度相拟合来识别地基回弹模量E_0和反应模量K.令两种理论(文克勒地基板理论和弹性半空间理论)在特定点计算的挠度值相等,实现E_0和K之间的转换.通过实例计算表明.本方法简单、易行、可靠.

Up to very recently, Chinese airport designers computed the foundation parameters by untilizing the maximum deflection measured under static loading[1]. The computations are quite straightforward but accuracy is relatively low. The authors employ the least squares method to make measured deflection curve and theoretical deflection curve fit so as to identify the modulus of resilience E_0 and the modulus of reaction K. Employing the E_0 and K so obtained can make calculated values of deflection very close to measured values of deflection, the biggest error being less than 10% generally. Chinese airport designers sometimes need to convert E_0 into K and vice versa. Yu et al gives a method for such conversion[2], but the value obtained by such conversion is considerably lower than the correct value. The authors now propose a much more accurate method of conversion based on fitting of two theoretical defleciton curves corresponding respectively to E_0 and K; The error is generally about 1% with maximum error not exceeding 2.7%. The computer program for facilitating the application of the authors' method has been repeatedly employed by designers at many Chinese airports. The designers' experiences confirm that the authors' method is reliable and easy to apply.