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为了地下隧道围岩的稳定和围岩的及时和有效的支护,基于5处隧道拱顶沉降的现场实测资料,对隧道拱顶的沉降-时间曲线进行了优化的拟合和沉降的预测.针对岩石隧道拱顶的沉降特性,选用了俞氏四参数曲线模型.结果表明,俞氏四参数模型对隧道拱顶的沉降-时间曲线有高的拟合精度,相关系数R为0.98955~0.99935,平均值为0.996102;该模型拟合效果比双曲线模型要好,特别是在曲线的尾部;基于该模型的5处隧道拱顶沉降的预测值与实测值的相对误差绝对值的平均值为4.01915%,对拟合曲线尾部3点来说是0.62348%.结果表明,本文选用的俞氏四参数模型适应性强,它对沉降-时间曲线的拟合是较为可靠的,利用这些拟合方程式能对隧道拱顶沉降进行预测.
In order to stabilize the surrounding rock of the underground tunnel and timely and effectively support the surrounding rock, the settlement-time curve of the tunnel vault was optimized to fit and predict the settlement based on the measured data of 5 tunnel domes. According to the settlement characteristics of rock tunnel dome, the four-parameter Yushu curve model was chosen.The results showed that the four parameters of Yu’s model had high fitting accuracy to the settlement-time curve of tunnel dome with the correlation coefficient R of 0.98955-0.999935, The average value is 0.996102. The model fitting effect is better than the hyperbola model, especially at the tail of the curve. Based on the model, the average value of the absolute value of the relative error between the predicted value and the measured value of 5 tunnel vault settlement is 4.01915% , 0.62348% for 3 points at the end of the fitted curve.The results show that Yu’s four-parameter model selected in this paper has strong adaptability, and it is more reliable for the fitting of settlement-time curve. Using these fitting equations, Tunnel vault settlement prediction.