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拓展双曲线方法是在常规双曲线法中引入荷载系数拓展而成的,它假定在荷载增量、加载速率变化不大的情况下,沉降变形的增量与荷载增量成正比。运用拓展双曲线法对铁路客运专线路基沉降进行预测,并与双曲线法、Asaoka法、三点法等预测方法的预测结果进行对比分析。结果表明:拓展双曲线法与实测曲线拟合较好,回归系数高,误差小,具有较高的工程应用价值。同时对比了不同时间起点、终点、加载期和观测频率的情况下,拓展双曲线法的预测结果,发现加载期观测频率对预测结果影响较小,而恒载时间越长,则沉降预测误差越小,相关系数越大,因此,运用拓展双曲线法时,恒载期的时间不宜小于4~5个月。
The expansion hyperbola method is developed by introducing the load coefficient in the conventional hyperbolic method. It assumes that the increment of settlement deformation is directly proportional to the load increment under the condition of small load and little change of loading rate. The expansion hyperbola method is used to predict the subgrade settlement of railway passenger dedicated line, and compared with the prediction results of hyperbolic method, Asaoka method and three-point method. The results show that the expansion hyperbola method and the measured curve fit well, the regression coefficient is high and the error is small, which has high engineering application value. At the same time, compared with the starting point, ending point, loading period and observation frequency at different time, the prediction results of hyperbolic method are expanded. It is found that the observation frequency of loading period has little effect on the prediction results, while the longer the dead load, the more the settlement prediction error Small, the greater the correlation coefficient, therefore, the use of expanding hyperbolic method, the time of constant load should not be less than 4 to 5 months.