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The stability of tunnel portal has its particularity. Due to the influence of natural or human factors, it is easy to produce cracking, landslide, collapse and other diseases. Taking the No.5 highway tunnel of F3 bid in Georgia as the background, using the finite element analysis software MIDAS-GTS to establish a three-dimensional model to simulate...
Context in source publication
Context 1
... the front slope of the tunnel entrance is gentle, the displacement along the excavation direction of the tunnel, i.e. the y-axis direction, is not considered. After the completion of numerical simulation, the analysis results of horizontal displacement and vertical displacement of surrounding rock under the condition of tunnel excavation with 100m in two kinds of portal support design schemes are intercepted (Figure 4-7). figure 7 that the maximum horizontal displacement of surrounding rock in the design of micro pile wall support is 6.99mm, and the maximum longitudinal vertical displacement is 21.45mm; the maximum horizontal displacement of surrounding rock in the design of bolt mesh shotcrete support is 3.55mm, and the maximum longitudinal vertical displacement is 8.73mm. ...
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