Neighborhood tunnel middle clamping rock strengthening method

A technology with small clear distance and rock inclusion, which is used in tunnels, tunnel linings, earthwork drilling, etc. It can solve the problems of cumbersome procedures and slow progress, and achieve the effects of simplifying procedures, reducing project costs and accelerating construction progress.

Active Publication Date: 2014-03-12
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a method for reinforcing interbedded rock in tunnels with a small clear distance in view of the above-mentioned problems, so as to s

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  • Neighborhood tunnel middle clamping rock strengthening method

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Example Embodiment

[0014] Such as figure 1 As shown, since the reinforcement of the rock in the tunnel with a small clear distance is basically closely related to the excavation of the tunnel, this embodiment combines the excavation of the tunnel to specifically explain the method of strengthening the rock in the tunnel with a small clear distance. as follows:

[0015] a. First, determine the support parameters and construction methods of the tunnel according to factors such as geological conditions, section shape, groundwater environment, and existing engineering design and construction experience.

[0016] b. Choose one of the tunnels 1 for excavation, and construct a large pipe shed 2 before excavation, which is arranged in the surrounding rock mass of the tunnel 1, and the arrangement range is from the arch on the side away from the Zhongjia Rock 3 The vault extends to the arch foot on the side close to the Zhongjia Rock 3, and the large pipe sheds 2 are arranged along the axial direction of the...

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Abstract

The invention relates to a neighborhood tunnel middle clamping rock strengthening method to solve the problems that a traditional strengthening method is complex in processes and relatively slow in schedule. According to the technical scheme, the neighborhood tunnel middle clamping rock strengthening method is characterized by comprising the following steps that firstly, advance pipe-shed supports are established before a tunnel is excavated and are arranged inside a rock on the periphery of the tunnel, the advance pipe-shed supports extend to the arch springing position close to the middle clamping rock from the spandrel position far away from the middle clamping rock through the vault, and all large-pipe shed supports are arranged in the axial direction of the tunnel; secondly, the tunnel is partially excavated and supported, and before the soil body close to the middle clamping rock is excavated, small guiding pipes are filled with thick liquid, secondary reinforcing is carried out, and the small guiding pipes are located on one side, close to the middle clamping rock, of the tunnel and extend to the arch springing position form the spandrel position of the tunnel. The neighborhood tunnel middle clamping rock strengthening method is suitable for strengthening low-grade surrounding rock sections and neighborhood tunnel middle clamping rocks with the clear distance smaller than or equal to 6m.

Description

technical field [0001] The invention relates to a method for reinforcing interbedded rock in tunnels with a small clear distance, which is mainly applicable to the reinforcement of interlayered rocks in tunnels with a small clear distance less than or equal to 6m in low-grade surrounding rock sections. Background technique [0002] The stability of the interlayer rock in the tunnel is one of the key points for the successful design and construction of the small clear distance tunnel. According to the requirements of the current code, for tunnels with a clear distance ≤ 6m, it is required to adopt advanced grouting and pull bolts to reinforce the interlayer rock. [0003] At present, three reinforcement technologies are mainly used for the reinforcement of interbedded rocks in small-space tunnels: small conduit grouting, system bolts, and horizontal tension prestressed bolts. In practical engineering, there have been 3 reinforcement methods used independently or in combinati...

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Application Information

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IPC IPC(8): E21D9/00E21D11/10
Inventor 邹金杰章立峰胡贤国彭加强朱锋盼
Owner POWERCHINA HUADONG ENG COPORATION LTD
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