Large-section tunnel stability control construction method capable of passing through earth and stone boundary stratum
A technology of stability control and construction method, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., and can solve problems such as surrounding rock deformation, tunnel face support deformation, and loss of support capacity
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[0110] Such as figure 1 Shown is a construction method for stability control of a large-section tunnel that crosses the soil-rock boundary stratum, and the cross-section of the tunnel to be constructed is greater than 100m 2 , combined with Figure 7 , the constructed tunnel is located in the earth-rock boundary stratum, and the earth-rock boundary stratum includes the loess layer 3 and the rock layer 4 below the loess layer 3, and the interface between the loess layer 3 and the rock layer 4 is an earth-rock interface; the constructed tunnel The tunnel hole 1 is divided into an upper hole body 1-1, a middle hole body 1-2 and a lower hole body 1-3 from top to bottom. The hole body formed after the step excavation, the middle hole body 1-2 is the hole body formed after the middle step excavation is carried out to the tunnel under construction from the back to the front, and the lower hole body 1-3 is the hole body from the back to the front The tunnel body formed after excavat...
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