裂隙围岩弹性力学参数反分析与验证

Back analysis of elastic mechanics parameters of cracked surrounding rock

以浙江某穿山隧道为工程背景,通过二次开发,建立UCODE软件与有限元软件之间接口程序,对隧道裂隙围岩弹性力学参数—围岩弹性模量E及泊松比υ,进行反分析计算,反分析计算设置四组待定参数初始值。迭代计算结果表明,对于不同的参数初始值,反分析结果收敛于同一组解,验证了反分析算法的稳定性。通过将围岩参数反分析结果与设定值比较,其相对误差分别为2.17%和2.53%,均满足反分析精度要求。

Based on a mountain tunnel excavation in Zhejiang Province, a back analysis was conducted to identify the elastic mechanical properties of cracked surrounding rock in the tunnel, such as elastic modulus E and Poisson,sratiov . The interface between the finite element software and UCODE was establ ished. Four groups of initial values of the elastic mechanical properties were set. Iteration results show that, for different initial values of mechanical properties, the results converged to the same set of solution. Then the stability of the back analysis algorithm was verified. The results also show that the relative errors of the evaluated elastic modulus E and Poisson’s ratiov are 2. 17% and 2. 53% ,respectively ,which meets the accuracy requirement.