Abstract
The high-pressure cavern is located below the diversion tunnel, which will produce a large seepage force during the excavation process. Consider the effect of seepage field on the stress field with the seepage force, consider the effect of stress and damage on the seepage field through the improved Louis formula, and establish the stress-damage-permeability coefficient equation to consider the effect of stress and damage on the seepage field. The three-dimensional elastoplastic damage finite element analysis of rock mass structure has established a stress-damage-seepage calculation model for surrounding rock excavation of a diversion tunnel with high-pressure cavities. A sequential iteration method is proposed to summarize the above factors and then iteratively solve them in a certain order. Based on a water diversion project, the relevant calculation examples are appropriately simplified. The results show that the seepage effect has a greater impact on the stability of the surrounding rock of the diversion tunnel, and it can be seen that the coupling effect cannot be ignored in the analysis of the stability of the surrounding rock of the excavation of the diversion tunnel.
Published Version
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