全风化花岗岩力学性能试验及蠕变参数反演

Mechanical Properties Test and Creep Parameter Inversion of the Fully Weathered Granite

以贵广线东科岭隧道为工程背景,开展了全风化花岗岩的常规力学性能试验和单轴压缩蠕变试验,并通过基于遗传算法的位移反分析,得到不同含水率条件下的蠕变参数。通过蠕变模型辨识,引入摩尔库仑塑性元件,将其与黏弹性Burgers模型串联起来,建立了六元件黏弹塑性Cvisc蠕变本构模型,得到了全风化花岗岩单轴蠕变数值曲线。

Based on the engineering background of Dongkeling tunnel of Guizhou-Guangzhou line,the conventional mechanical properties test and uniaxial creep test of the fully weathered granite are carried out. Through the identification of creep model,the six element viscoelastic plastic Cvisc creep constitutive model is built by making series connection between the Mohr Coulomb plastic components and the viscoelastic Burgers model. Then creep parameter inversion is carried out using displacement back analysis method based on genetic algorithm,and the creep parameter under different moisture content conditions are obtained by forward and inversion analysis. Finally,the numerical curves of uniaxial creep which is obtained by simulating the numerical test of uniaxial creep and uniaxial creep test curves are compared and analyzed to verify the correctness and reliability of the inversion parameters.