The support structure and support method of the side wall of the tunnel in the steeply inclined thin surrounding rock

Abstract

The invention discloses a supporting structure for the tunnel side wall in forward steep-inclined thin layer surrounding rock and a supporting method, belongs to the field of tunnel construction, and provides a supporting structure capable of effectively controlling unfavorable deformation of the tunnel side wall in the forward steep-inclined thin layer surrounding rock. A transverse connecting rib structure is additionally arranged on a traditional foundation provided with system anchor bolt supporting only, transverse connecting ribs are spliced into a net shape and then attached to the surface of the side wall in a closely matched mode, on one hand, certain supporting force can be provided for the surrounding rock between system anchor bolts to prevent the surrounding rock between system anchor bolts from locally collapsing, on the other hand, the system anchor bolts are connected through the transverse connecting ribs into a whole, and the overall supporting strength of the system anchor bolts can be improved; the supporting effect of the side wall is improved finally, then unfavorable deformation of the tunnel side wall in the forward steep-inclined thin layer surrounding rock is effectively controlled, and meanwhile sprayed concrete cracking or local falling caused by unfavorable deformation is avoided.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a support structure for a side wall of a tunnel in steeply inclined thin surrounding rock and a support method for the support structure. Background technique [0002] Thin-layered surrounding rock with steep slope in the same direction means that the direction of the rock strata is close to parallel to the excavation direction of the tunnel, generally <30°, the inclination angle of the inclined surface of the rock stratum is close to 90°, generally >60°, and the thickness of a single layer of rock is usually less than 10cm Layered surrounding rock. After the tunnel is excavated, the surrounding rock of this type is usually exposed in a large area on the side walls of the tunnel on both sides, and the exposed surrounding rock is prone to bending under the action of unloading, upper pressure and gravity. Fracture, buckling and layer peeling. The existing initia...

AI Technical Summary

Problems solved by technology

However, due to the large distance between adjacent bolts, and there is usually no other effective connection or only a reinforcement mesh layer between the bolts, it is impossible to give enough resistance to the deformed surrounding rock between the bolts, so that the bolts The surrounding rock in the space is prone to large unfavorable deformation, which will cause cracks or partial drop of the shotcrete, which greatly increases the safety risk during the construction period. At the same time, in the post-processing process, the concrete and Cleaning up and re-supporting the loose surrounding rock will increase the construction period and investment, which is not conducive to the overall control of the project

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