Construction method for subway tunnel penetrating through building in fractured rock stratum

A construction method and building technology, applied in tunnels, earthwork drilling, mining equipment, etc., to reduce disturbance, improve the bearing capacity of surrounding rock, and be widely applicable

Inactive Publication Date: 2015-06-10
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of safety protection of buildings on the ground when passing through the tunnel construction in the fractu

Method used

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  • Construction method for subway tunnel penetrating through building in fractured rock stratum
  • Construction method for subway tunnel penetrating through building in fractured rock stratum
  • Construction method for subway tunnel penetrating through building in fractured rock stratum

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Embodiment Construction

[0029] The present invention is further described with reference to the accompanying drawings.

[0030] The subway station tunnel 4 described in this embodiment has an excavation width of 21.9m, a total height of 16.2m, and an upper soil thickness of 9-12m. The surrounding rock is mainly full and strongly weathered granite, with broken rock formations and well-developed joints. The grade of the surrounding rock is Level V. The tunnel 5 attached to the station is excavated with a width of 9m and a height of 7.1m. It passes through the national key building 1 with a crossing length of 18.2m. The vertical height to the building base 2 is only 8.5m. It is a strip-shaped rubble. In order to control the uneven settlement of the building 1 caused by tunnel construction in the fractured rock stratum and avoid damage to the building 1 caused by blasting vibration, the technical solution of the present invention is proposed.

[0031] The present embodiment method comprises the followi...

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Abstract

The invention discloses a construction method for a subway tunnel penetrating through a building in a fractured rock stratum. The construction method mainly comprises the following steps: firstly utilizing a deep hole grouting process to reinforce a stratum; excavating a tunnel by circularly utilizing mechanical excavation and explosion, and after the excavation of a tunnel face is completed, immediately performing primary support in an anchor rod, bar-mat reinforcement, shotcrete and grid combined support manner till the tunnel penetrates through the building; finally performing grouting reinforcement of a tunnel inner deep hole sleeve valve tube. According to the construction method, by utilizing central mechanical excavation and circumferential smooth blasting techniques, the disturbance of the penetrating-tunnel explosion construction to the fractured rock stratums is reduced, the expansion and growth of rock body internal micro-defects are effectively controlled, the expanding and shaking losses to the building are avoided; due to the field vibration speed monitoring, the explosion vibration speed of a to-be-tested point of the building is within 10 mm/s, which meets the standard requirements.

Description

technical field [0001] The invention relates to the technical field of subway tunnel construction. Background technique [0002] With the rapid development of urban underground rail transit in my country, more and more subway tunnels pass through key protected buildings, especially in the geological conditions of fractured rock formations, where the surrounding rock stability is poor, rock mass joints are well developed, and blasting vibration is easy Causes the expansion and penetration of micro-pores and micro-cracks inside the rock mass, resulting in excessive deformation of the ground settlement, resulting in uneven settlement of ground buildings and cracking damage, and the blasting construction through the tunnel will also cause vibration damage to the building structure, seriously affect the long-term stability of the building. Therefore, how to control the blasting vibration velocity in tunnel construction and avoid the settlement, deformation and instability of build...

Claims

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Application Information

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IPC IPC(8): E21D9/00
CPCE21D9/00E21D9/001E21D9/006
Inventor 王渭明孙捷城
Owner SHANDONG UNIV OF SCI & TECH
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