基于施工期变形监测的特高拱坝力学参数反演研究

Inversion of mechanical parameters of super-high arch dam based on deformation monitoring during construction period

利用施工期内的各种变形监测数据,来反演300 m级特高拱坝真实力学参数具有重要的工程和科学意义。提出了一种基于特高拱坝施工期仿真应力的反演分析混合模型,该模型基于施工期大坝和基础监测的垂向压缩变形,来反演施工期真实力学参数,并以溪洛渡特高拱坝为例,验证了该模型的适用性与可行性:基于施工期精密水准仪的监测值反演了大坝的弹性模量,基于施工期多点位移计的监测值分段反演了基岩的变形模量,结果表明,该反演混合模型获得的反演值与弹性模量和变形模量的实测值均较为接近。研究成果可为同类特高拱坝工程的真实力学参数反演问题提供借鉴与科学依据。

To deduce the real mechanical parameters of 300 m super-high arch dam inversely based on the various observation data during construction period, is of great engineering and research significance. In this paper, an inversion hybrid model of super-high arch dam is proposed based on simulating stress during construction period, which aims to deduce the real mechanical parameters inversely based on the vertical compressive deformation of dam and foundation detected in the period of construction. The practicality and feasibility of this model are validated by an case study of Xiluodu super-high arch dam. The elastic modulus of the dam body is inverted based on the observation of precise leveling instrument during construction, and the deformation modulus of its foundation is inverted according to the observation of multi-point extensometer during construction. The results show that the values obtained by the inversion hybrid model agree well with the actual measured elastic modulus and deformation modulus. The results in this current paper can provide research references for similar problem of super-high arch dams.