以京津城际铁路工程为例，系统地介绍了无碴轨道客运专线（高速铁路）桥梁沉降观测的具体要求、方法，并提出了沉降评估的数学模型和判定条件。

Specific requirements and methods of settlement monitoring which are used in bridge of unballasted track passenger dedicated line or high-speed railway are introduced systematically, and mathematical model and determinant conditions of settlement are proposed simultaneously, taking Beijing-Tianjin inter-city railway as an example.