Abstract:

The surrounding ground of the Metro works is a complex natural geologic body, which is not only heterogeneous, aeolotropic and discontinuous, but also is subject to the influence of the initial stress and the ground water. Therefore, it is difficult to determine all kinds of variable mechanical parameters and engineering design index of the surrounding ground. So far, there is no method by which the stability of the surrounding ground can be effectively evaluated. By means of mathematic tools and mechanic principles, the article establishes the relation equations between the monitoring effect variables and the dependent variables and analyses on their correlations and action mechanisms. By means of determining the displacement that the excavation releases and analyzing on the probability of the surrounding ground and the reinforcement stability, the article makes a prediction on the developing tendency of the effect variables, so that judgment can be made on the stability of the surrounding ground during construction.