Abstract
During the construction of underground caverns, the stability of deep underground cavern excavation, which affects the safety and sustainable development of such projects, is a hot issue. First, based on the mechanical properties of surrounding rock in deep tunnels, the strain-softening behavior, damage, and heterogeneity of rock masses are analyzed. Then, a strain-softening model of heterogeneous jointed rock mass that considers statistical damage (SSD) is developed and implemented through FLAC3D simulation software. Finally, the SSD is applied to a deep roadway in the Jinchuan mining area, and a comparative analysis of the computation results of the Mohr–Coulomb (MC) model and the strain-softening (SS) model are carried out. The numerical results are compared with the field-monitoring results, which show that the SSD model simulated the behavior of the surrounding rocks well. The results show that the deformations of the roof and floor are larger, which may serve as a reference for the support pattern of deep roadways.
Highlights
Rock mass is a kind of complex geological body composed of structural planes and rock blocks
With the construction of a series of large-scale projects around the world, many countries have carried out experimental research on the rock mechanics, thermodynamics, seepage, and long-term stability of rock mass in deep underground engineering
In order to study the stability of deep tunnels and to address the shortcomings of the current constitutive model, a strain-softening model of heterogeneous jointed rock mass considering statistical damage was developed and implemented through FLAC3D simulation software
Summary
Rock mass is a kind of complex geological body composed of structural planes and rock blocks. Researchers from various countries have carried out systematic research work on deep underground projects, such as the South-to-North Water Transfer Project and the Jinping II Hydropower Station in China [4,5], in situ tests at Yucca Mountain in the United States [6] and in the Aspö Hard Rock Laboratory (HRL) in Sweden, and the DECOVALEX project, which is jointly carried out by European countries [7,8]. These large projects promote the development of rock mass mechanics. The rationality of the proposed constitutive model is discussed, and the case study provides a reference for the simulation calculation of other similar projects
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