顾及流变参数的时序InSAR公路形变模型研究

形变模型制约着时序InSAR技术形变估计的精度，传统InSAR形变模型大多采用一种或几种纯经验函数组合来拟合形变随时间演化的物理过程，未顾及监测对象物理力学特性，本项目拟针对软土地基公路变形监测，结合土体流变学，提出一种顾及物理参数的形变模型，以提高公路形变监测精度，更合理的解译形变估计结果。首先剖析软土地基公路变形机理，比选流变模型，建模InSAR视线向形变与流变参数的函数关系；其次，剖析新模型非线性特性，研究可顾及非线性强度的参数估计算法，实现新模型复杂非线性参数估计，并开展模型参数检验与优化；定量、系统分析各流变参数与形变、相位的影响关系，剖析其误差传递特性，以揭示流变参数对形变估值的影响规律；最后，开展公路测试区形变估计实例研究，验证模型精度。项目将结合软土地基公路材料流变特性，实现时序InSAR物理力学模型的构建；有利于公路工后长期变形分析解译，可为路基稳定性控制提供借鉴。

The precision of deformation estimation using time series InSAR technique is restrained by deformation model. Most of the traditional deformation models for InSAR deformation monitoring are pure empirical mathematical models, without considering the physical mechanism of the monitored object. Due to this, a new InSAR time series deformation model for soft clay road, considering physical parameters, is established, in order to improve the precision of long time deformation monitoring after road embankment settlement construction, and more reasonably interpret the displacement result. Firstly, with analysis of the displacement mechanism of the soft clay, the rheological models are analysed and compared, and the relational functional model between the LOS deformation and rheological parameters will be established; Secondly, the nonlinear characteristics will be studied, in the purpose of solving the complicated nonlinear parameter estimation problem, meanwhile the significance of the parameters in the new model will be tested meticulously, in order to optimize the rheological parameters in the new model; The influence relationship between the rheological parameters and the deformation estimations will be analysed, to show the error transformation discipline between the observation and parameters. Finally, case study of deformation estimation will be carried out, to assess the precision of modelling comprehensively. In this study, the rheological characteristics for soft clay road are considered in traditional InSAR deformation model, and the time series InSAR physical mechanical deformation model can be established; the result can be utilized to interpret the long-time deformation, which can be referred to by the field of road embankment stability control.