A Construction Method of Long-distance Pilot Pilot Controlled Blasting for Ultra-short-distance Laminated Tunnel
A construction method and advanced control technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of rock mass instability and damage, structural cracking, and uneven settlement of the upper hole, etc., to reduce blasting vibration, Guaranteeing the construction progress and reducing the cross-sectional area
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[0040] Examples see Figure 1-2 As shown in the figure, the excavated tunnel of the exit line of a certain subway project obliquely intersects with the main line tunnel, and the length of the overlapping line is about 58m. The minimum vertical distance between the exit line tunnel and the main line tunnel of the overlapping line section is 2m, that is, the thickness L of the interlayer rock mass is not less than 2m, see Figure 1-2 The position relationship diagram of the cross-section of the stacked line segment at B.
[0041] The exit line tunnel and the main line tunnel are basically in the slightly weathered mixed rock here, and the surrounding rocks of the excavation sections of the exit line tunnel and the main line tunnel are both grade III. In this embodiment, the main line tunnel is the leading tunnel 1, that is, the upper tunnel, and the exit line tunnel is the backward tunnel 2, that is, the lower tunnel.
[0042]Determining the minimum spacing of stacked tunnels ...
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