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Method for positioning temporary middle walls in large-section tunnel supporting structure of formation with soft top and hard bottom

A positioning method and technology of support structure, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as large deformation, unsafe accidents, excessive temporary support, etc.

Active Publication Date: 2015-04-08
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

For this kind of upper soft and lower hard formations, if the step method is adopted, large deformation and unsafe accidents will inevitably occur; Temporary support is also used, resulting in too many temporary supports, and large mutual interference, slow construction and high cost

Method used

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  • Method for positioning temporary middle walls in large-section tunnel supporting structure of formation with soft top and hard bottom
  • Method for positioning temporary middle walls in large-section tunnel supporting structure of formation with soft top and hard bottom
  • Method for positioning temporary middle walls in large-section tunnel supporting structure of formation with soft top and hard bottom

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Embodiment Construction

[0053]The structure and method of the present invention will be further described below with reference to the accompanying drawings.

[0054] Such as figure 1 As shown, the position of the temporary middle wall in the excavation and support structure of the long-span tunnel used for the upper soft and lower hard stratum surrounding rock, the support structure includes advance support, initial Whether to set up a partition wall shall be analyzed based on the hard stratum boundary conditions.

[0055] The actual use process is as follows:

[0056] Step 1: Apply the force method in structural mechanics and the force characteristics of primary support to analyze the force state of the upper soft and lower hard stratum structure, including the following aspects:

[0057] (1) Analysis of the stress state of the initial support of the tunnel when there is no middle wall

[0058] Since the lining structure is subjected to relatively large vertical and horizontal pressures, under th...

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Abstract

The invention discloses a method for positioning temporary middle walls in a large-section tunnel supporting structure of a formation with a soft top and a hard bottom. The method comprises the following steps of (1) analyzing a stress state of a structure of the formation with the soft top and the hard bottom by using a force method in structural mechanics and preliminary bracing stress properties, analyzing the stress state of a preliminary support of a tunnel when the middle walls do not exist, calculating a foundation load of arch feet of the preliminary support of the tunnel when the middle wall do not exist, analyzing the stress state of the preliminary support of the tunnel when the middle walls exist, and calculating the foundation load of the preliminary support of the tunnel when the middle walls exist; (2) further discussing a stress mechanism of the structure of the formation with the soft top and the hard bottom according to analysis of the stress state; and (3) preliminarily judging whether the temporary middle walls of an upper step, a middle step and a lower step are mounted or not according to a formation mode, the specific position of a boundary of the formation with the soft top and the hard bottom and the condition of hardness of surrounding rocks.

Description

technical field [0001] The invention relates to the field of tunnel support structures, in particular to a positioning method for a temporary middle wall in a large-section tunnel support structure with upper soft and lower hard composite formations. Background technique [0002] The 21st century is the century of underground space. With the further development of the western region and the construction of subways and intercity railways in major provincial capitals and prefecture-level cities, more and more tunnels will emerge, especially large-span and large-section tunnels. The surrounding rock classification of tunnels is usually divided into different grades according to the different mileage ranges of the longitudinal section. However, in the entrance section or shallow buried section, due to the gradual weakening of the weathering degree from the surface to the interior, the surrounding rock is usually soft at the top and hard at the bottom, that is, the surrounding roc...

Claims

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Application Information

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IPC IPC(8): E21D11/00G06F17/50
CPCE21D11/00G06F30/13
Inventor 安永林施成华贺建清吴波王志斌陈伟
Owner HUNAN UNIV OF SCI & TECH
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