路基沉降预测的非等间隔Asaoka法

Non-equal Interval Asaoka Method for Predicting Subgrade Settlement

路基沉降预测对于确保高速铁路无砟轨道结构铺设质量非常重要。《客运专线铁路无砟轨道铺设条件评估技术指南》中推荐的沉降预测方法对沉降观测数据时间间隔的要求并不一样。其中,Asaoka公式是根据一维固结问题推导得出,具有明确的物理意义,但需要沉降观测数据为等时间间隔数据。根据微分变差分原理,采用前向差分和后向差分推导出了非等间隔Asaoka法。工程实例应用结果显示非等间隔Asaoka法具有较好的预测效果,可以直接应用于非等间隔沉降数据,避免了Asaoka方法在应用中存在的问题。

The prediction of subgrade settlement is of great importance to ensure the laid quality of ballastless track of high speed railway. The recommended forecast methods in 〈 Assessment technology guide of laid condition of ballastless track of passenger dedicated railway 〉 are different in the require- ment of time interval of settlement observation data. Among these methods, the theoretical basis of Asao- ka method is explicit, which is Mikasa consolidation equation for 1-d consolidation problem. However, Asaoka method need the time interval of settlement observation data is equal. It cannot directly apply to analyze the non-equal interval settlement data in practical applications. In this paper, non-equal interval Asaoka method is proposed by changing differential to difference by using forward difference and back- ward difference. For a case study, test results verify the validity of non-equal interval Asaoka method.