Construction method for ultra-short-distance overlapped line tunnel long-distance guide pit advance control bursting

It is a technology of advanced control and construction method, which is applied in the direction of tunnels, earthwork drilling, mining equipment, etc., and can solve problems such as instability and damage of interlayer rock mass, uneven settlement of upper holes, and structural cracking, so as to reduce blasting vibration, Reduce the cross-sectional area and ensure the effect of construction progress

Active Publication Date: 2016-07-20
CHINA CONSTR COMM ENG GRP UNITED
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for super-short-distance stacked-line tunnel long-distance pilot-pit pre-controlled blasting, to solve the problem existing in the excavation...

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  • Construction method for ultra-short-distance overlapped line tunnel long-distance guide pit advance control bursting
  • Construction method for ultra-short-distance overlapped line tunnel long-distance guide pit advance control bursting
  • Construction method for ultra-short-distance overlapped line tunnel long-distance guide pit advance control bursting

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Embodiment Construction

[0040] Examples see Figure 1-2 As shown in the figure, the excavated tunnel of the exit line of a certain subway project obliquely intersects with the main line tunnel, and the length of the overlapping line is about 58m. The minimum vertical distance between the exit line tunnel and the main line tunnel of the overlapping line section is 2m, that is, the thickness L of the interlayer rock mass is not less than 2m, see Figure 1-2 The position relationship diagram of the cross-section of the stacked line segment at B.

[0041] The exit line tunnel and the main line tunnel are basically in the slightly weathered mixed rock here, and the surrounding rocks of the excavation sections of the exit line tunnel and the main line tunnel are both grade III. In this embodiment, the main line tunnel is the leading tunnel 1, that is, the upper tunnel, and the exit line tunnel is the backward tunnel 2, that is, the lower tunnel.

[0042]Determining the minimum spacing of stacked tunnels ...

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Abstract

The invention discloses a construction method for ultra-short-distance overlapped line tunnel long-distance guide pit advance control bursting. The construction method includes following steps: excavating an advance hole of an overlapped lien section; determining basic data of bursting network designing; determining bursting key parameters; determining bursting mode; constructing a bursting cloth hole of a long-distance guide pit; constructing a bursting cloth hole of a short-distance arch pit; setting bursting parameters; arranging explosive; detonating the long-distance guide pit; detonating the short-distance arch pit; reinforcing preliminary support. Aiming at the characteristic of minimum net-distance section construction, designing optimizing is majorly performed on bursting scheme, so that bursting disturbance degree is reduced. Maximum section explosive loading capacity is adjusted by selecting half-section bursting network design for sectional bursting and combining a distance between two lines of the advance hole and a following hole with requirements on bursting vibration speed, so that good construction effect is acquired.

Description

technical field [0001] The invention relates to a construction method for underground excavation of a superimposed line tunnel, in particular to an underground excavation method for an ultra-short distance superimposed line tunnel with long-distance pilot pit controlled blasting in advance. Background technique [0002] With the vigorous development of urban subway construction, the urban underground space has been continuously developed and utilized, and there are more and more small distance tunnels. For the tunnel with small clear distance, the thickness of interlayer rock mass is relatively thin, which becomes the weak link under force due to the multiple disturbances of blasting excavation, and the stability of surrounding rock is poor. Therefore, the protection of interlayer rock mass during construction will be Very important. The most important and difficult points in the construction of small-space tunnels are how to reasonably select the excavation sequence, contr...

Claims

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Application Information

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IPC IPC(8): E21D9/00
CPCE21D9/006
Inventor 高健杨楠吴全立张津辉雷伽肖乾东王七龙石小军
Owner CHINA CONSTR COMM ENG GRP UNITED
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