High-strength confined concrete supporting system applicable to underground tunnel

Abstract

The invention discloses a high-strength confined concrete supporting system applicable to an underground tunnel. The high-strength confined concrete supporting system comprises multi-truss confined concrete arch frames, wherein the confined concrete arch frames support tunnel surrounding rock and are successively distributed along a tunnel, two adjacent confined concrete arch frames are connected with each other by virtue of a longitudinal connection mechanism to perform the arch frame positioning and assembling, and after the arch frames are well installed, ordinary connection reinforcing steel bars are welded to form the supporting system; and a plurality of layers of reinforcing steel bar nets are arranged at the surrounding rock side and the tunnel side, and the supporting system and each reinforcing steel bar are sprayed with a concrete spray layer. By adopting the high-strength confined concrete supporting system, the arch frames and the concrete spray layers are well bonded and are not stripped under the load of the surrounding rock, and reinforcing ribbed plates are welded on the arch frames; the adjacent confined concrete arch frames are automatically connected by virtue of longitudinal connecting ribs with a snap spring or are connected in a welding manner by virtue of the ordinary reinforcing steel bars; and for the part of each arch frame with relatively high stress, the reinforcing steel bars or steel plates are used for reinforcement.

Description

technical field [0001] The invention relates to a high-strength restrained concrete support system suitable for underground tunnels. Background technique [0002] With the rapid development of the scale and speed of tunnel construction, newer and higher requirements are constantly put forward for transportation, which greatly promotes the gradual expansion of the scale of transportation infrastructure construction and the rapid development of expressway construction. There is a big improvement in terms of scale. It can be foreseen that in the next few decades, a large number of tunnels with distinctive characteristics such as "large cross-section, large buried depth, high stress, long tunnel line, weak and broken" will be built under complex geological conditions. Safety and stability issues are becoming more and more prominent, and the failure control mechanism and support countermeasures of super-large-section tunnels with weak surrounding rocks need to be further studied...

AI Technical Summary

Problems solved by technology

When the tunnel passes through the weak and broken surrounding rock, the excavation disturbance will inevitably cause large deformation of the surrounding rock. If the support bearing capacity is insufficient, the deformation of the surrounding rock may exceed its allowable range. major economic loss

In the support of tunnels with large sections and broken surrounding rocks, the traditional I-steel arch frame and grid steel frame support methods cannot effectively control the surrounding rock, resulting in high support costs and increased risks of surrounding rock instability , construction and operation safety factor is too low and other issues

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