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在软弱岩体中设计地下工程时,考虑到岩体的流变性质确定其力学参数和地应力是必要的。本文给出了符合马克斯威尔、鲍埃丁—汤姆逊和H—K粘弹性力学模型的岩体在开挖地下圆形隧洞时的相对径向位移公式。在这些位移公式中包含全部待定的未知数,当圆洞的相对径向位移值可以测定时,我们就有可能由位移反分析法求得这些未知参数。为了使反分析能够易于实现,我们采用了两步反分析法,其优点在于减少了每一次反算参数的个数,因而大大的加快了反分析的速度。
When designing underground engineering in soft rock mass, it is necessary to determine the mechanical parameters and ground stress considering the rheological properties of rock mass. This paper presents the relative radial displacement formula of rock masses excavating underground circular tunnels in accordance with Maxwell, Bowden-Thomson and H-K viscoelastic models. In these displacement formulas, all unknown unknowns are included. When the relative radial displacements of the circular holes can be determined, it is possible to obtain these unknown parameters by the displacement back analysis. In order to make the back analysis easier to implement, we have adopted a two-step back analysis method, which has the advantage of reducing the number of back-calculated parameters at each time, thus greatly accelerating the speed of back analysis.