Excavation technique for shallow-buried large-span small-spacing loess tunnel
A technology for tunnel excavation and loess tunnels is applied in the field of excavation of loess tunnels with large spans and small clear distances. Application value and academic value, the effect of reducing the loss of surrounding rock bearing capacity and ensuring structural stability
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[0035] The double-track tunnel construction of the present invention adopts double pilot tunnel excavation. Both pilot tunnels of the double-track tunnel adopt the three-step core soil method. For the first tunnel and the second tunnel, the first excavation away from the middle soil column is preferred. side.
[0036] The method for digging a large-span and small-distance loess tunnel of the present invention is divided into left and right tunnel construction. After construction, the left and right holes have the same structure, figure 1 Shown in is its structure. During construction, either the left hole or the right hole can be excavated first. The pilot hole on each side of the left and right holes is divided into three steps of excavation of the upper step, the middle step and the lower step. For the convenience of description, the present invention is explained by first excavating the left hole as an example.
[0037] Reference figure 1 As shown, a large-span and small-dista...
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