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Method for determining wear loss of composite stratum shield hob

A technology for composite strata and determination methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as unconsidered impact, inapplicable hob wear prediction, etc., to shorten the construction period and reduce tool change cost effect

Active Publication Date: 2018-07-06
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method is only applicable to uniform hard rock formations, and does not consider the influence of soft and hard formation transitions on hob wear in composite formations, so it is not suitable for prediction of hob wear in composite formations

Method used

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  • Method for determining wear loss of composite stratum shield hob
  • Method for determining wear loss of composite stratum shield hob
  • Method for determining wear loss of composite stratum shield hob

Examples

Experimental program
Comparison scheme
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Embodiment

[0052]A subway project is constructed using the shield method. During the construction of the shield through the soft-hard composite stratum, there were several times of opening and changing the cutter, and the hob was seriously worn. Take the first two tool change intervals of this project as an example to illustrate.

[0053] Such as Figure 1-Figure 3 As shown, a method for determining the wear amount of a shield hob in a composite stratum, the method includes the following steps:

[0054] The first step is to determine the stratum stratification along the tunnel planning route and the stratum strength S of each stratum by drilling method and unconfined compression test.

[0055] In this step, the drilling method refers to: use thick-walled earth-borrowing equipment to drill holes from the surface to the underground every 35m in the construction area to the buried depth of 1.5 times the planned subway line, the surface elevation is 1.12m, and the planned subway line is bu...

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PUM

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Abstract

The invention provides a method for determining the wear loss of a composite stratum shield hob. The method comprises the steps of step 1, determining stratum distribution situation along a tunnel planning line and stratum strength S of each stratum by adopting a drilling method and a unconfined compression test; step 2, collecting shield parameters and stratum parameters during the constructionprocess, and determining the dynamic load coefficient nd and the friction coefficient alpha of the to-be-predicted hob; step 3, determining the correlation coefficient k between the friction energy and the accumulated wear loss Q of the hob according to the tool change data in the early stage of shield construction; step 4, determining the accumulated wear loss Q according to a prediction model and the number of tunneling rings N, and determining the timing of replacing the hob according to the wear limiting value Q0. By adopting the method, the purposes of achieving reasonable arrangement ofthe timing of warehouse opening and tool changing, reducing the cost of the tool changing, and shortening the construction period can be achieved.

Description

technical field [0001] The invention relates to a compound stratum shield technology in the technical field of underground engineering, in particular to a method for determining the wear amount of a shield hob in a compound stratum. Background technique [0002] In recent years, with the rapid development of urban construction in my country, the subway has gradually become the first choice for new public transportation due to its advantages of high transportation efficiency, low environmental disturbance, and high utilization of underground space. However, as an underground construction project, subway construction has higher requirements for engineering construction technology. Although the subway line selection design will try to avoid geological conditions with potential safety hazards, due to the complex geological conditions of some cities or due to considerations such as urban planning and construction costs, the subway line will inevitably pass through complex geologi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 任栋杰伍慧龙沈水龙许烨霜
Owner SHANGHAI JIAO TONG UNIV
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