Construction method of large-section tunnel support system suitable for steeply inclined layered rock mass
A construction method and large-section technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as vault caving, prone to engineering accidents, unfavorable construction of large-section tunnels, etc., to ensure rock mass and reinforcement strength and the effects of deformation properties
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[0035] Example: such as figure 1 As shown, in this embodiment, the large-section tunnel support system suitable for steeply inclined layered rock mass is divided into: the upper guide tunnel I in the down-inclined layer, the guide tunnel II in the upper reversed-dip layer, and the middle part in the down-dip layer. Pilot tunnel III, pilot tunnel IV in the middle anti-inclined layer, lower pilot tunnel V, upper middle pilot tunnel VI, and core soil area VII. All are the relative positions between the pilot tunnel and the steep layered surrounding rock 5.
[0036] The construction method of support system in the present embodiment comprises the following steps:
[0037] ① Excavate the pilot tunnel I in the upper oblique layer first, and construct the grid steel frame reinforcement layer 11, temporary support 6, the grid steel frame reinforcement layer 11 in the upper oblique layer and the second lining 12 in the upper oblique layer, in which the upper oblique layer The layer g...
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