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A Calculation Method of Additional Load for Partial Demolition of Tunnel Lining

A calculation method and technology of additional loads, applied in geometric CAD, special data processing applications, etc., can solve problems such as hidden safety hazards, inability to determine the bearing state of existing structures adjacent to the tunnel lining, insufficient bearing capacity, etc., to ensure construction safety and structural integrity. stable effect

Active Publication Date: 2022-03-25
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the tunnel has serious damages such as serious lining encroachment, material deterioration, and serious insufficient bearing capacity, it is necessary to replace the original lining structure to maintain the normal service state of the tunnel engineering. However, in the tunnel lining replacement plan, the lining is removed. The link with the highest risk and difficulty
[0003] After the tunnel is completed, the surrounding rock and the structure are in a relatively stable equilibrium state. At this time, the removal of the local lining will have an unloading effect on the stable surrounding rock, resulting in the redistribution of the ground stress, causing an increase in the local load, and even secondary surrounding rock and structure. Therefore, it is necessary to determine the degree and scope of the impact of this unfavorable load on the existing structure in order to take reasonable and effective preventive measures to ensure construction safety and structural stability. The commonly used methods for determining the tunnel surrounding rock load are Theoretical calculation, empirical analogy, direct measurement, etc., but these methods are mainly used in the tunnel construction period, and cannot determine the load-bearing state of the adjacent existing structures after the partial removal of the tunnel lining, and cannot meet the structural stability analysis requirements of the tunnel disease treatment project

Method used

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  • A Calculation Method of Additional Load for Partial Demolition of Tunnel Lining
  • A Calculation Method of Additional Load for Partial Demolition of Tunnel Lining
  • A Calculation Method of Additional Load for Partial Demolition of Tunnel Lining

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specific Embodiment 1

[0055] Specific embodiment 1: Taking a circular cross-section tunnel as an example, in the calculation of actual working conditions, the tunnel cross-sections of other shapes are equivalent to circular cross-sections or calculated by complex variable functions, and the bearing layer of the lining structure is composed of the primary lining layer and the secondary lining The object of the partial lining demolition is only the secondary lining layer. The generalization method of the geometric analysis model and elastic foundation beam calculation model of the tunnel lining demolition is as follows:

[0056] (1) The secondary lining layer, primary lining layer, and surrounding rock bearing layer are assumed to be an infinitely long cylindrical structure with the same center, and are divided into several fan-shaped band-shaped calculation elements with a central angle of dθ along the center of the circle, as shown in figure 1 and figure 2 As shown, the thickness of the lining str...

Embodiment 2

[0077] Example 2: A deep buried tunnel with a circular section, the inner clearance radius is 6.0m, the bearing layer of the lining structure is composed of the primary lining layer and the secondary lining layer, and its specific parameters are: the thickness of the primary lining is 22cm, and the elastic modulus is 25.38 GPa, the shotcrete grade is C30, the secondary lining thickness is 40cm, the elastic modulus is 28GPa, the molded concrete grade is C40, the surrounding rock grade is V grade, and the weight is 18kN / m 3 , Elastic modulus is taken as 1.3GPa, lateral pressure coefficient is taken as 0.4, and the objects of partial lining removal are primary lining layer and secondary lining layer.

[0078] The generalization method of the geometric analysis model and elastic foundation beam calculation model of the tunnel lining removal is as follows:

[0079] (1) The secondary lining layer, primary lining layer, and surrounding rock bearing layer are assumed to be an infinite...

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Abstract

The invention relates to a structural stability analysis method for tunnel lining removal, in particular to an additional load calculation method for partial removal of tunnel lining. The implementation steps of the calculation method include: (1) generalizing the elastic foundation for partial removal of tunnel lining Beam calculation model; (2) determine the undetermined parameters of the governing equation of the elastic foundation beam calculation model; (3) calculate the additional load and scope that the adjacent structure bears due to the partial removal of the lining, compared with the prior art, the present invention has the advantages The effect is: it can calculate the additional load on the adjacent structure caused by the partial removal of the multi-layer lining of the tunnel, determine the influence range of this unfavorable load, evaluate the structural stability state when the tunnel lining is partially removed, support the selection of reasonable pre-reinforcement measures, and ensure that the tunnel Construction safety and structural stability for lining removal operations.

Description

technical field [0001] The invention relates to a structural stability analysis method for tunnel lining removal, in particular to an additional load calculation method for partial removal of tunnel lining. Background technique [0002] With the continuous increase of tunnel operation time, its service conditions and service environment are constantly changing, and a large number of in-service tunnels have various types and degrees of diseases, which affect the service performance and operational safety of tunnels. At present, there are many methods for tunnel disease treatment, which can be selected based on comprehensive consideration of safety, economy, and timeliness. However, when the tunnel has serious damages such as serious lining encroachment, material deterioration, and serious insufficient bearing capacity, it is necessary to replace the original lining structure to maintain the normal service state of the tunnel engineering. However, in the tunnel lining replacem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13
CPCG06F30/13
Inventor 李磊雷可
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT