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Test method for bearing capacity of secondary lining concrete structure of tunnel

A concrete structure and secondary lining technology, applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., can solve the problems of undetectable bearing capacity, frequent changes of tunnel surrounding rock, and difficulty in guaranteeing construction quality

Active Publication Date: 2012-06-20
宁波市交通建设工程试验检测中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in highway, railway, municipal, water conservancy and other projects, the tunnel is a common structure, and the secondary lining concrete structure is the main structure of the tunnel. Now the conventional design method of the secondary lining concrete structure is to use the analogy method to design, and then Checked through theoretical calculations or verified by indoor model tests, but due to the complex geological conditions and frequent changes in the surrounding rock of the tunnel, it is difficult to accurately determine the geological parameters of theoretical calculations or indoor models, resulting in discrepancies between theoretical calculations or indoor model test results and actual conditions. Large, can not accurately reflect the actual project
At the same time, the construction quality of the primary support of the tunnel and the on-site pouring of the secondary lining concrete is also difficult to guarantee. It is precisely because there is no test method for the bearing capacity of the secondary lining concrete structure of the tunnel at present, and its bearing capacity cannot be tested, and the general design is relatively conservative. , resulting in a large waste of
During the quality inspection and acceptance, its bearing capacity cannot be tested. Once the construction is completed, if there are quality problems, it will not be found, and safety hazards cannot be eliminated. This is one of the main reasons for the frequent occurrence of tunnel safety accidents.

Method used

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  • Test method for bearing capacity of secondary lining concrete structure of tunnel
  • Test method for bearing capacity of secondary lining concrete structure of tunnel
  • Test method for bearing capacity of secondary lining concrete structure of tunnel

Examples

Experimental program
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Embodiment 1

[0028] A two-lane tunnel with a width of 9 to 10 meters, and the surrounding rock category is Class 3. After the initial support of the tunnel is completed, according to the test and detection frequency of the secondary lining concrete structure of the tunnel, a section with a length of about 10 meters (one formwork length ) in the test area of ​​the tunnel, the pressure boxes 1 are fixed and buried on the initial support of the tunnel in advance, the number is 40 to 60, and each pressure box 1 is connected to the computer through wires; when the secondary lining concrete starts construction, 8 ~10 hooks 2 are fixedly buried in the secondary lining concrete of the tunnel; during the load test, select the measuring points on the surface of the secondary lining concrete, and paste 40 to 60 stress and strain gauges 6; hang the hanging rod 3, the spring scale 4, and the stacking platform 5 Connect to the hook 2 in turn; choose a feasible vehicle for loading, and load step by step w...

Embodiment 2

[0030] A three-lane tunnel with a width of 14 to 15 meters, and the surrounding rock category is Class 3. After the initial support of the tunnel is completed, according to the test and detection frequency of the secondary lining concrete structure of the tunnel, a section with a length of about 10 meters (one template length ) in the test area of ​​the tunnel, the pressure boxes 1 are fixed and buried on the initial support of the tunnel in advance, the number is 60 to 80, and each pressure box 1 is connected to the computer through a wire; when the secondary lining concrete starts to be constructed, 10 ~14 hooks 2 are fixedly buried in the secondary lining concrete of the tunnel; during the load test, select the measuring points on the surface of the secondary lining concrete, and paste 60 to 80 stress and strain gauges 6; hang the hanging rod 3, the spring scale 4, and the stacking platform 5 Connected to the hook 2 in turn; choose the heavy load method for loading, and load...

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Abstract

The invention relates to a test method for bearing capacity of a secondary lining concrete structure of a tunnel. The method comprises the following steps of: embedding a plurality of pressure cells between the primary support and the secondary lining concrete of the tunnel in advance; fixedly embedding a plurality of hooks on the secondary lining concrete of the tunnel in advance, wherein the left side and the right side of the same section are respectively provided with one hook, and the hooks are symmetrically distributed along the axis of the secondary lining concrete of the tunnel; orderly connecting and mounting a hanging bar, a spring scale and a stacking and loading platform on the hooks; selecting a surface testing point of the secondary lining concrete, and pasting a plurality of stress strain gauges; performing stepwise loading on the stacking and loading platform; and reading data for analysis. The method can effectively test and detect the bearing capacity of the secondary lining concrete structure of the tunnel, and is a non-destructive testing test method, so that the method cannot destroy the original secondary lining concrete structure of the tunnel, but also can provide important scientific basis for design, construction and project final acceptance.

Description

technical field [0001] The invention relates to the field of quality control of tunnel secondary lining concrete, in particular to a test method for the bearing capacity of tunnel secondary lining concrete structure. Background technique [0002] At present, in highway, railway, municipal, water conservancy and other projects, the tunnel is a common structure, and the secondary lining concrete structure is the main structure of the tunnel. Now the conventional design method of the secondary lining concrete structure is to use the analogy method to design, and then Checked through theoretical calculations or verified by indoor model tests, but due to the complex geological conditions and frequent changes in the surrounding rock of the tunnel, it is difficult to accurately determine the geological parameters of theoretical calculations or indoor models, resulting in discrepancies between theoretical calculations or indoor model test results and actual conditions. Large, cannot...

Claims

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Application Information

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IPC IPC(8): G01N3/32
Inventor 周一勤张旭东周琪
Owner 宁波市交通建设工程试验检测中心有限公司