中文摘要：

运营维护期轨道交通线下工程受动、静态荷载及复杂环境因素影响,其变形规律常呈现“小量级、大波动”的特点,而采用曲线拟合方法很难捕捉此种变形规律。目前常采取的方法是根据经验对沉降变形曲线总体的收敛状水平及其发展趋势做出判定。这种做法缺乏一定的科学性、严谨性。对于无法通过曲线回归方法预测的沉降监测点,寻找一种科学的判断标准十分必要。研究利用统计假设检验中χ^2检验法进行沉降评估,结果表明,对于“小量级、大波动”的变形规律,χ^2检验法可作为一种科学合理的沉降分析和判定方法。

英文摘要：

Railway underline engineerings during operation and maintenance period usually bear the influence of dynamic and static load of train operation and complex factors of monitoring environment. Thus, it is hard to ob-tain good effect when predicting this deformation trend of such characteristics by curvilinear regression fitting methods. At present, the overall convergence level and developing trend of settlement curves will be decided based on experience. Obviously, such methods are neither scientific nor precise. It is urgent to find certain scien-tific standard for these settlement points whose deforming regular can 51 be predicted by curve regression methods. This paper studied the the χ^2 test for settlement assessment, the results show that the χ^2 test can be taken as ascientific and reasonable method of settlement analysis and judgement.