刚性路面弯沉盆面积指数反演改进方法

Improved Deflection Basin Area Parameters Back Calculation Method for Rigid Pavement

为了解决传统的弯沉盆面积指数法在刚性路面结构参数反演过程中没有充分利用各个测点的挠度信息,反演结果存在多解性的问题,根据弯沉盆面积指数法的基本原理,对其进行了几点改进,即:弯沉盆面积指数不再直接用于定值求解相对刚度半径,而用于确定相对刚度半径的取值范围;采用了计算与实测弯沉盆间的拟合挠度误差作为反演结果的判定标准。结果表明:改进方法综合了弯沉盆面积指数法和弯沉盆逐点拟合法的优点,对于实测弯沉盆各测点提供的信息利用更加充分;且由于采用了拟合挠度误差作为判断依据,解决了反演结果多解性问题;该改进方法提高了刚性路面结构参数反演结果的合理性。

In order to solve some shortcomings of deflection basin area parameters back calculation method, such as inadequate using deflection information of each sensor and multiple solution about structural parameters, according to basic principle of deflection basin area parameters back calculation method, the method was improved. The improved method of back calculation which integrates the respective strongpoint of deflection basin area method and best-fit method was proposed. In the improved method, deflection basin area method was used to determine the range of radii of relative stiffness rather than the value of radii of relative stiffness directly, and the best-fit method was adopted according to criterion of fitting accuracy error between measured deflection basin and calculated deflection basin. Results show that the improved method combines advantage of deflection basin area parameters back calculation method with advantage of best-fit method which makes full use of information supplied by sensors of field measurement deflection basin; regarded fitting deflection error as judgement criterion, multi-solution problem of back calculation result was solved. It improves the rationality of structural parameters back calculation result for rigid pavement.