Tunnel support structure suitable for large deformation of soft rock and construction method thereof

Abstract

The invention discloses a tunnel support structure suitable for large deformation of soft rock. The tunnel support structure includes a steel frame support structure and an initial shotcrete and rockbolt support laid on the inner wall of a soft-rock large deformation tunnel inner wall, and several feet-lock bolts are arranged on the initial shotcrete and rock bolt support, the steel frame supportstructure includes a steel corrugated plate, a high strength spring and a ring support, the steel corrugated plate is connected to the feet-lock bolts, one end of the high strength spring is connected to the steel corrugated plate, the other end of the high strength spring is connected to the ring support, and the axial direction of the high strength spring is the same as the radial direction ofthe ring support. On the one hand, the tunnel support structure can reduce damage to the structure by the large deformation of surrounding rock of the tunnel by releasing a certain amount of deformation of the surrounding rock, and the deformation resistance and structural stability of the tunnel structure are effectively improved; and on the other hand, the structure with greater rigidity can resist the deformation of the surrounding rock after the deformation of the surrounding rock is released to a certain degree, so that the purpose of rigid and flexible supporting is achieved.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a tunnel support structure suitable for large deformation of soft rock and a construction method thereof. Background technique [0002] In recent years, with the rapid development of my country's infrastructure construction, the number of tunnel projects built in the construction of roads, railways, water conservancy and other projects has also increased. The complexity and risk in the tunnel engineering construction process put forward higher requirements for the safety and practicability of the tunnel engineering lining structure. [0003] The large deformation of the tunnel is characterized by progressive and time-dependent deformation of the surrounding rock after the tunnel excavation is completed. For support measures with large deformation, no matter the support before excavation or the reinforcement measures after excavation, the construction is more troublesome, and th...

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Problems solved by technology

However, in many construction processes, the above two methods have certain problems, mainly because where the deformation of the surrounding rock is too large, if the initial support with high structural stiffness is used, it may still not be able to resist its deformation, and the pressure of the surrounding rock will accumulate. At a certain stage, it will cause brittle damage to the initial support with high rigidity; if the flexible support is used to "release" part of the deformation first to reduce the overall force of the support structure, it may be due to unreasonable and effective Control the amount of deformation, resulting in excessive deformation, resulting in structural damage and encroachment and other problems

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