路堤沉降计算中邓肯-张模型参数修正初探

有限单元法是计算路堤沉降常见的数值计算方法，其中土体模型参数的真实性是该法计算结果高精度的保证。首先，针对邓肯-张非线性模型中各参数对沉降影响的程度进行了分析，找到了灵敏度较大的5个参数。然后，利用人工神经网络技术，结合前期沉降实测资料，提出了一种反馈修正K，G这两个主要参数的思路。计算表明：此种修正法是可行的，且依据修正后参数的沉降计算结果更准确，在工程实践中有一定的参考价值。

Discussion on parameter modification of Duncan-Chang model in settlement calculation of embankment

Finite element method is a familiar method in settlement calculation of embankment, and the authenticity of soil model parameters is the guarantee of higher accurate results. Firstly, the analyses aimed at influencing degree of Duncan-Chang model parameters to settlement are done; and the five parameters with larger sensitivity are found; Then with artificial neural network technology, a thought of two model parameters modification (K, G) is brought forward combined with measured settlements. It shows that this thought is reasonable and the calculational results with modified parameters are more precise. In a way, it can be reference in engineering.