Research On Evaluation And Analysis Of Settlement Deformation In High Speed Railway

The demand for settlement deformation monitoring is more prominent with the rapid development of China's high-speed railway.Settlement has four stages: occurrence,development,stability and limit.The settlement is generally a nonlinear and trend-changing process under the interference of the external environment.The automatic settlement deformation monitoring technology can meet the needs of highfrequency,real-time settlement deformation monitoring.The current high-speed railway settlement assessment regulations and specifications only consider the analysis and determination of settlement stability,ignoring the analysis of the settlement process.In order to realize the settlement process analysis and stability determination of the automatic settlement monitoring data,the thesis improves the STARS(Sequential T-test Analysis of Regime Shifts)mean point model and the SIC(Schwarz Information Criterion)variance point model based on the change point theory.Settlement assessment analysis is carried out in combination with simulation data and engineering case data.The specific contents and results are as follows:1).Automatic settlement monitoring can obtain high-frequency settlement monitoring data in real time,which is convenient for monitoring the settlement process of monitoring objects.Settlement burst or acceleration can be characterized by the mean change of settlement data.Based on this,the settlement model analysis model is established based on the improved STARS mean point change theory to realize realtime warning in the case of settlement anomaly;2).The automatic settlement monitoring data is analyzed by improving the STARS mean point change point model,and the settlement stability is determined when the settlement data is in a horizontal convergence and stable state.Whether the settlement is stable or not can be realized by the variance test of the settlement monitoring data: The settlement stability evaluation model is established according to the improved SIC variance change point theory,which can effectively determine the settlement stability;And a kind of a priori error method which is independent of the length of the calculation interval is obtained,so that the chi-square test can also effectively determine the settlement stability.