G(1,1)模型只利用单点已测数据进行预测该点的位移,而不管别的因素的影响。而事实上该点位移和围护桩上其他点的位移及锚索拉力是耦合的。针对传统的单因素灰色模型在基坑预测中的不足之处,提出采用多因素的G(1,N)灰色模型对基坑位移进行预测研究。计算实例表明,该模型预测精度高,所需数据少,简单实用,值得在大跨桥梁基坑预测中推广。 The G (1,1) model uses only single point measured data to predict the displacement of this point, regardless of other factors. In fact, the displacement of this point and other points on the retaining pile displacement and anchor cable tension are coupled. In view of the shortcomings of traditional single-factor gray model in pit prediction, a multi-factor G (1, N) gray model is proposed to predict the displacement of pit. The calculation example shows that the model has high prediction accuracy and less data, which is simple and practical. It is worth to be popularized in the prediction of long-span bridge foundation pit.