顾及循环荷载的公路时序InSAR建模与形变估计

车辆长期循环荷载是造成公路工后沉降不可忽视的因素。目前公路形变监测中采用的InSAR时序形变模型多为一种或几种纯经验函数组合而成，物理意义不够明确，且忽略了循环荷载对沉降的贡献。本项目拟针对软土地基公路形变估计，提出一种物理意义明确，可描述软土在长期循环荷载作用下变形发展过程的形变模型，以提高公路形变监测精度，更合理地解译形变估计结果。首先，研究车辆循环荷载引起的软土附加动应力经验模型，修正传统静力荷载下的模型及参数，构建时序InSAR形变组合模型，并开展模型比选及检验；其次，研究适用于新模型分段非线性特性的参数估计算法，获取形变参数解，评定参数精度；研究模型各参数对形变估值的敏感性，以揭示参数误差对形变估计精度的影响规律；最后，开展公路测试区的形变估计实例研究。项目将会完善传统时序InSAR物理模型，提高公路形变估计精度；有利于工后长期变形分析解译，为路基稳定性控制提供借鉴。

The traffic repeated loading is an essential factor inducing post-construction settlement of highway subsidence. Most of the traditional deformation models for InSAR deformation monitoring are pure empirical mathematical models, without physical significance and considering the contribution of traffic repeated loading. A new InSAR time series deformation model for soft clay highway deformation monitoring, with clear physical significance, which can describe the temporal deriving process of deformation under long-term traffic repeated loading, is established. The new model can improve the precision of post-construction settlement estimation, and more reasonably interpret the displacement result. Firstly, the empirical models of dynamic stress induced by traffic repeated loading will be studied. The models and parameters under static loading will be modified, thus the combinate InSAR deformation model will be established; Secondly, the estimation methodology, applicable to the complicated subsection and nonlinear characteristics, will be studied. Then the estimation of the parameters will be obtained and the precision will be evaluated. To show the error transformation discipline between the observation and parameters, the influence relationship between the deformational parameters and the deformation estimations will be analysed. Finally, case study of deformation estimation will be carried out, to assess the precision of modelling comprehensively. In this study, the traditional time series InSAR physical mechanical deformation model can be improved; the result can be utilized to interpret the long-term deformation, which can be referred to by the field of road embankment stability control.