软土路基沉降预测方法探讨

双曲线法、指数曲线法和三点法均是软土路基沉降预测的常用方法,此三种方法对沉降观测时间均有要求。为此,以某高铁试验段的塑料排水板联合超载预压加固处理测出的路基沉降数据为基础,分析这三种方法的适应性和稳定性。结论为:在恒载6个月内,不同预测方法和实测值变化规律基本一致;双曲线法预测的最终沉降总体上较其他方法大;指数法一和三点法以前3个月、后3个月和6个月数据为基础的预测规律最接近,以前3个月和后3个月的数据为基础的两次预测的沉降差值最小。

On Methods of Settlement Prediction for Soft Soil Roadbed

Common soft soil roadbed settlement prediction methods such as hyperbolic method,exponential curve method and three-point method all require observation time.This paper researched on the suitability and stability of the above methods based on data of settlement prediction got by plastic waterspout combined with surcharge precompression on the test section of one high-speed railway.The analytic result shows that the variation laws with different prediction methods were in good agreement with those of the measured data after six months of constant load,and the predicted final settlement with hyperbolic method was larger than those with other methods.Prediction laws with the methods of exponential curve method and three-point method were close to each other in the data of three months before,three months later and six months,and the settlement discrepancy of the two predictions is the smallest which are based on the data of three months before and three months later.