Abstract
In order to verify the universal applicability of the fluid structure coupling model to the analysis requirements of deep tunnels under the MIDAS-GTS geotechnical simulation environment, the study, together with several mining enterprises, carried out verification and analysis on the measured data of 107 deep tunnels in recent years. The reference group selects the mean value of the analysis results generated by the analysis model using the preferred nonfluid structure coupling model in the MIDAS-GTS environment. Finally, it is confirmed that the fluid structure coupling model group data have significant advantages over the reference group data within the buried depth of 550 ∼ 1450 m and the tunnel cross-sectional area of 45 ∼ 102 m2. Finally, it is considered that the fluid structure coupling model has universal applicability within the analysis range. It is suggested that, in the future work, for example, when the tunnel construction project within the above analysis scope needs to carry out the simulation analysis of roof displacement and anchor bolt tension, the fluid structure coupling model should be directly selected as the analysis model.
Highlights
E metal passive support structure is built in the passive support structure layer, and the metal passive support structure layer is modeled according to the actual size of metal support structures such as steel beam and steel strip. e surrounding rock part is divided into the anchor layer and the surrounding rock layer. e anchor layer is designed according to 1.2 times of the anchor length or 0.7 times of the anchor cable structure
All simulations are performed in MIDAS-GTS environment
The actual effects of the two groups of simulation are compared with the simulation results of roof displacement and bolt tension
Summary
Deep tunnels are divided into development tunnels and mining area tunnels. e development tunnel is generally excavated in the whole rock in the stable rock stratum, the tunnel section is large, the tunnel is far from the coal seam and soft rock stratum, its service time is long, and the pressure environment is relatively stable. E development tunnel is generally excavated in the whole rock in the stable rock stratum, the tunnel section is large, the tunnel is far from the coal seam and soft rock stratum, its service time is long, and the pressure environment is relatively stable. Mining area tunnels are generally excavated near or in coal seams, with short service time and complex pressure environment [4]. E mining area tunnel in this study is subject to the pressure control technology of deep tunnel, and less all coal or all soft rock tunnel is selected. It is generally arranged along the coal seam roof. Because the excavation maintenance period of most deep tunnels is
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