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Method for designing long-distance small-spacing tunnel

A design method and technology of small clear distance, applied in tunnels, tunnel linings, mining equipment, etc., can solve the problems of blasting vibration long-distance small clear distance tunnels, difficult reinforcement of rock pillars, etc., and achieve good results

Inactive Publication Date: 2011-12-21
DALIAN MUNICIPAL DESIGN & RES INST
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Problems solved by technology

[0003] In order to solve the above-mentioned problems in the prior art, the present invention will design a long-distance tunnel design method with small clear distance that can solve the difficulty in reinforcing rock pillars at small clear distances and the problems of blasting vibration.

Method used

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  • Method for designing long-distance small-spacing tunnel
  • Method for designing long-distance small-spacing tunnel
  • Method for designing long-distance small-spacing tunnel

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings. Such as Figure 1-3 As shown, a long-distance tunnel design method with small clearance includes the following steps:

[0034] A. Advanced support

[0035] Before tunnel excavation, the following advanced support methods are selected according to different levels of surrounding rock:

[0036] A1. For the V-level surrounding rock, the large pipe shed 1 advanced support method is adopted. The specific construction steps are as follows: first install the arch, which is the foundation of the pipe shed. It is an arch structure erected by concrete and I-shaped steel , there is a casing on it. During the construction of the large pipe shed 1, the pipe shed drilling machine is used to drill the pipe shed according to the position of the casing. After drilling, a steel pipe with a diameter of 108mm is inserted in the hole, and the steel pipe is inserted in sections. Use thread...

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Abstract

The invention discloses a method for designing a long-distance small-spacing tunnel. In the method, before the tunnel is excavated, different advanced support modes are selected according to different grades of surrounding rocks; for V-grade surrounding rock, a large pipe-shed advanced support mode is adopted, for IV-grade surrounding rock, a small duct advanced support mode is adopted; for III-grade surrounding rock, a longitudinal anchor rod advanced support mode is adopted; different steel arch models and spaces are selected for primary support according to the grades of the surrounding rocks; a reinforced concrete mode and a plain concrete mode are adopted; and a linear presplitting blasting and weak blasting technology is adopted for tunnel blasting. By the method, the limitation of a specification on the space of the small-spacing tunnel is broken, support parameters are constantly adjusted in the construction process, and corresponding reliable support systems are established according to different grades of the surrounding rocks to guide designs and construction. By the method, the minimum spacing between tunnels is 4.5 meters.

Description

technical field [0001] The invention relates to a tunnel design technology, in particular to a design method for a long-distance tunnel with small clear distance. Background technique [0002] At present, the relevant technologies of single-hole tunnel and separated double-hole tunnel have matured, but for long-distance and small-clear tunnels with long excavation distances and small distances between tunnels, and weak surroundings with shallow buried geological conditions Due to the interaction between the rock and the tunnel, the construction of this type of tunnel is still very difficult. "Code for Design of Highway Tunnels" JTG-2004 Article 4.3.2 specifies the minimum clear distance of separated double tunnels. The minimum clear distance of grade VI surrounding rock is 3.5 times the width of the excavation section, taking Dalian Jiaojinshan Tunnel as the example. For example, according to the specification requirements, the minimum clear distance should be 13 meters × 3...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/14E21D11/00E21D11/10E21D11/18
Inventor 张铁柱
Owner DALIAN MUNICIPAL DESIGN & RES INST
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