Test Method for Evaluating Size Effects on Tunnel Excavation Response

A technology of size effect and test method, applied in the field of rock underground engineering, can solve the problems of complex geological conditions, inability to accurately reproduce the characteristics of rock mass, difficulty in the actual impact of size effect engineering excavation, etc., and achieve low technical difficulty and low test cost. Effect

Active Publication Date: 2015-11-18
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, the current study on the size effect lacks suitable research methods, and it is difficult to meet the actual needs of the project. Especially, the geological conditions of the underground engineering are extremely complex, and it is impossible to accurately reproduce the on-site conditions by simply relying on theories, laboratory tests, numerical models, etc. Rock mass characteristics, the actual impact of size effects on engineering excavation becomes more difficult

Method used

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  • Test Method for Evaluating Size Effects on Tunnel Excavation Response
  • Test Method for Evaluating Size Effects on Tunnel Excavation Response
  • Test Method for Evaluating Size Effects on Tunnel Excavation Response

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: as figure 1 As shown, in this embodiment, by directly arranging monitoring instruments around the excavation tunnel, by capturing the excavation response of tunnels with different cross-section sizes, the understanding of the size effect is obtained; the specific steps are as follows:

[0018] a. Excavate an auxiliary tunnel 2 parallel to it on one side of the tunnel to be excavated 1, and ensure that the distance between the two holes (the tunnel to be excavated and the auxiliary tunnel) is greater than three times the diameter of the tunnel to be excavated 1, In order to avoid the stress disturbance area; the size of the auxiliary hole 2 should meet the requirements of instrument installation and data acquisition as the minimum limit, and 3m×3m can basically meet the requirements. In this example, the cross section of the auxiliary hole 2 is a circle with a diameter of 3m (the The section can also be a square with a side length of 3m);

[0019] b. Use t...

Embodiment 2

[0021] Embodiment 2: as image 3 As shown, the construction steps of this embodiment are basically the same as those of Embodiment 1. The difference is that in step c, the central part of the tunnel 1 to be excavated is first excavated, and then the central part is used as the center to expand the excavation around the center, and the two The shape of the secondary excavation section is the same.

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Abstract

The invention relates to a test method for evaluating influence of the size effect on a tunnel excavation response. The test method for evaluating the influence of the size effect on the tunnel excavation response aims to overcome the detects of limitation for size requirements of an indoor test and harsh requirements for technique of numerical simulation. According to the technical scheme, the test method for evaluating the influence of the size effect on the tunnel excavation response comprises the steps that (a) an auxiliary tunnel, parallel to a tunnel to be excavated, is excavated in one side of the tunnel to be excavated, and the distance between the auxiliary tunnel and the tunnel is more than three times larger than the diameter of the tunnel to be excavated; (b) holes are drilled in the tunnel to be excavated from the auxiliary tunnel, monitoring instruments are buried in the holes, and at least three monitoring sections are formed; (c) part of the section of the tunnel to be excavated is excavated, the surrounding rock excavation response caused in the excavation process is caught through the monitoring instruments buried in the holes, and then the whole section is excavated, the surrounding rock excavation response caused in the expanding excavation process is caught through the monitoring instruments buried in the holes, and then the influence of different excavation sizes on the excavation response can be evaluated. The test method for evaluating the influence of the size effect on the tunnel excavation response is applicable to rock underground engineering.

Description

technical field [0001] The invention relates to a test method for evaluating the effect of size effect on tunnel excavation response, which is mainly applicable to underground rock engineering. Background technique [0002] When excavating a tunnel in the underground rock mass, the surrounding rock of the tunnel will have different excavation responses due to the change of the in-situ stress field. Since the rock mass is composed of rocks and structural planes of different scales, different excavation responses appear after tunnels of different sizes are excavated, showing a size effect. Size effect is a hot research problem in rock mechanics and rock mass engineering, and it is also a difficult problem. The research on this problem generally starts with theoretical research, experimental research and numerical methods. Among them, the theoretical research method has been the key method of work in the past few decades, and has made some progress, but it still cannot accurat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
Inventor 刘宁张春生吴旭敏褚卫江
Owner POWERCHINA HUADONG ENG COPORATION LTD
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