Strain Transfer of Bonded FBG Sensor for Coal Mining Similar Model

2015 ◽  
pp. 20-28
Author(s):  
Guihua Zhang
Keyword(s):  
Coal Mining ◽  
Similar Model ◽  
Strain Transfer ◽  
Fbg Sensor

scholarly journals Analysis of the strain transfer in a new FBG sensor for Structural Health Monitoring

2011 ◽  
Vol 33 (2) ◽  
pp. 539-548 ◽  
Author(s):  
Benjamin Torres ◽  
Ignacio Payá-Zaforteza ◽  
Pedro A. Calderón ◽  
Jose M. Adam
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Strain Transfer ◽  
Structural Health ◽  
Fbg Sensor

scholarly journals The Field Monitoring Experiment of the Roof Strata Movement in Coal Mining Based on DFOS

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1318 ◽  
Author(s):  
Tao Hu ◽  
Gongyu Hou ◽  
Zixiang Li
Keyword(s):  
Optical Fiber ◽  
Coal Mining ◽  
Coal Mine ◽  
Shanxi Province ◽  
Transfer Performance ◽  
Test Results ◽  
Strata Movement ◽  
Strain Transfer ◽  
Study Results ◽  
Roof Strata

Mining deformation of roof strata is the main cause of methane explosion, water inrush, and roof collapse accidents amid underground coal mining. To ensure the safety of coal mining, the distributed optical fiber sensor (DFOS) technology has been applied in the 150,313 working face by Yinying Coal Mine in Shanxi Province, north China to monitor the roof strata movement, so as to grasp the movement law of roof strata and make it serve for production. The optical fibers are laid out in the holes drilled through the overlying strata on the roadway roof and BOTDR technique is utilized to carry out the on-site monitoring. Prior to the on-site test, the coupling test of the fiber strain in the concrete anchorage, the calibration test of the fiber strain coefficient of the 5-mm steel strand (SS) fiber, and the test of the strain transfer performance of the SS fiber were carried out in the laboratory. The approaches for fiber laying-out in the holes and fiber’s spatial positioning underground the coal mine have been optimized in the field. The indoor test results show that the high-strength SS optical fiber has a high strain transfer performance, which can be coupled with the concrete anchor with uniform deformation. This demonstrated the feasibility of SS fiber for monitoring strata movement theoretically and experimentally; and the law of roof strata fracturing and collapse is obtained from the field test results. This paper is a trial to study the whole process of dynamic movement of the deformation of roof strata. Eventually the study results will help Yinying Coal Mine to optimize mining design, prevent coal mine accidents, and provide detailed test basis for DFOS monitoring technique of roof strata movement.

scholarly journals The Strain Transfer Mechanism of Fiber Bragg Grating Sensor for Extra Large Strain Monitoring

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1851 ◽  
Author(s):  
Li Sun ◽  
Chuang Li ◽  
Chunwei Zhang ◽  
Tianqi Liang ◽  
Zihao Zhao
Keyword(s):  
Large Scale ◽  
Large Strain ◽  
Adhesive Layer ◽  
Amplification Coefficient ◽  
Strain Transfer ◽  
Fbg Sensor ◽  
Strain Monitoring ◽  
Wide Range ◽  
Excellent Property ◽  
Bragg Grating Sensor

This research focuses on a desensitization method to develop a wide-range FBG sensor for extra-large strain monitoring, which is an essential requirement in large scale infrastructures or for some special occasions. Under appropriate hypotheses, the strain transfer distribution of wide-range FBG sensor based on the shear-lag theory is conducted to improve the accuracy of extra-large strain measurements. It is also discussed how the elastic modulus of adhesive layer affects the strain transfer rate. Two prototypes in different monitoring ranges are designed and fabricated by two layers of steel pipe encapsulation. The presented theoretical model is verified by experimental results. Moreover, it is demonstrated that experimentation in regards to the calibration of the wide-range FBG sensor, improved the amplification coefficient up to 2.08 times and 3.88 times, respectively. The static errors are both calculated and analyzed in this experiment. The wide-range FBG strain sensor shows favourable linearity and stability, which is an excellent property of sensors for extra-large strain monitoring.

Study on Strain Transfer of Substrate Encapsulation FBG Strain Sensor

2014 ◽  
Vol 578-579 ◽  
pp. 1037-1041 ◽  
Author(s):  
Li Sun ◽  
Bo Zhang ◽  
Chuang Li ◽  
Chuan Yun Yue
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Multilayer Structure ◽  
Transfer Rate ◽  
Strain Sensor ◽  
Stress And Strain ◽  
Element Analysis ◽  
Strain Transfer ◽  
Fbg Sensor ◽  
Fbg Sensors

The FBG sensors of measuring stress and strain on the surface of concrete are mainly based on substrate encapsulation in engineering. Since the substrate encapsulation FBG sensor has a multilayer structure, there is certain consumption when the stress is transferred from the surface of concrete to optical fiber, which leads to difference between measured value and actual value. This paper analyzes the influencing factors of strain transfer rate by the method of theoretical calculation and finite element analysis. The formula of strain transfer is thereby obtained.

Coal Mining

1886 ◽  
Vol 22 (560supp) ◽  
pp. 8940-8940 ◽  
Keyword(s):  
Coal Mining

‘Nothing is simply one thing’: Woolf, Deleuze and Difference

2013 ◽  
Vol 7 (4) ◽  
pp. 456-474
Author(s):  
Beatrice Monaco
Keyword(s):  
Virginia Woolf ◽  
Prose Poetry ◽  
Close Reading ◽  
Similar Model ◽  
Complex Interplay ◽  
To The Lighthouse

This paper explores some key texts of Virginia Woolf in the context of Deleuzian concepts. Using a close reading style, it shows how the prose poetry in Mrs Dalloway engages a complex interplay of repetition and difference, resulting in a remarkably similar model of the three syntheses of time as Deleuze understands them. It subsequently explores Woolf's technical processes in a key passage from To the Lighthouse, showing how the prose-poetic technique systematically undoes the structures of logical fact and rationality inscribed in both language and everyday speech to an extremely precise level.

A Prehistoric Ford near Rough Castle, Falkirk

2001 ◽  
Vol 23 (2) ◽  
pp. 91-103
Author(s):  
JAMIE HAMILTON ◽  
CIARA CLARKE ◽  
ANDREW DUNWELL ◽  
RICHARD TIPPING
Keyword(s):  
Coal Mining ◽  
Pollen Analysis ◽  
Site Formation ◽  
Site Formation Processes ◽  
Formation Processes ◽  
Radiocarbon Dates ◽  
Small Stream ◽  
Mining Project ◽  
First Millennium

This report presents the results of the excavation of a stone ford laid across the base of a small stream valley near Rough Castle, Falkirk. It was discovered during an opencast coal mining project. Radiocarbon dates and pollen analysis of deposits overlying the ford combine to indicate a date for its construction no later than the early first millennium cal BC. Interpreting this evidence was not straightforward and the report raises significant issues about site formation processes and the interpretation of radiocarbon and pollen evidence. The importance of these issues extends beyond the rarely investigated features such as fords and deserve a larger place in the archaeological literature.

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