Scale model test on shallow tunnel anchorage under soft rock geological conditions
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Abstract:
In order to study the deformation and bearing capacity of the tunnel anchorage, a field model test on the scale of 1:30 was carried out on the north shore of the Chongqing Jijiang Yangtze River bridge. The follow conclusions are drawn:From the design load (240 kN) to 1 680 kN, the average maximum displacement of the front anchor face of the anchorage along the drawing direction ranges from 0.020 mm to 0.808 mm, and the average maximum displacement of the upper rock mass above the front and the rear ends of the anchorage along the vertical direction ranges from 0.028 mm to 749 mm and 0.014 mm to 0.645 mm, respectively; The failure type of the rock-anchor system is tension-shear failure; About 2-3 m range rock mass above the lateral direction of the two anchorages participates in bearing deformation, and the damage area of the rock mass along the axis of the anchorage is similar to a plug body; The reliable bearing capacity of the anchorage model under tension is 1 344 kN through the model test; The rheological behavior of anchorage model under tension of 840 kN is stable, and its long-term stability coefficient is 3.5. The results of the model test show that the tunnel anchorage has high bearing capacity under tension, thus, the design scheme is proved to be feasible.
