Dynamic strain wave analyses of parallel cut blasting model tests for vertical shaft

Rock Engineering and Rock Mechanics: Structures in and on Rock Masses ◽

10.1201/b16955-200 ◽

2014 ◽

pp. 1159-1164

Author(s):

Qin Ma ◽

Pu Yuan ◽

Bo Han ◽

Jing-Shuang Zhang ◽

Han-Xi Liu

Keyword(s):

Model Tests ◽

Dynamic Strain ◽

Vertical Shaft ◽

Strain Wave

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Experiment on Different Length/Diameter Ratio Charge Explosive Strain Wave Propagation in Rock

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.170-173.343 ◽

2012 ◽

Vol 170-173 ◽

pp. 343-347

Author(s):

Ren Shu Yang ◽

Xiang Tao Gao ◽

Yu Long Che

Keyword(s):

Diameter Ratio ◽

Energy Utilization ◽

Relative Distance ◽

Dynamic Strain ◽

Testing System ◽

Peak Strain ◽

Rock Blasting ◽

Strain Wave ◽

Strain Testing ◽

Relationship Of

In order to explore the blasting effect with charged by different length/diameter ratio in rock, adopted ultra-dynamic strain testing system to test the blasting strain wave with charged by little amount of explosives and different length/diameter in the rock models. Analyzed the radial blasting strain wave signal in the medium under the conditions of coupling charging explosive loading, got the generalities and difference of the explosive strain waveform features with charged by different length/diameter ratio, and relationship of peak strain with the relative distance. The results show that peak strain was greatly affected by the change of length/diameter ratio and charge mass in the area of close blasting source, when the relative distance is more than 45, the influence is less. Made the length/diameter ratio is 20 to be the boundary, when the length/diameter ratio is greater than 20, the peak strain attenuated slowly. The explosive energy of the big length/diameter ratio is relatively decentralized to the medium, improved the energy utilization ratio of explosives. The measured results provided a new experimental basis to further understand correctly the rock blasting mechanism.

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Lag Time and Working Frequency of FBG Strain Sensor

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.381-382.505 ◽

2008 ◽

Vol 381-382 ◽

pp. 505-508

Author(s):

Li Sun ◽

Hong Nan Li ◽

D.Z. Liang ◽

J. Fang

Keyword(s):

Low Frequency ◽

Strain Sensor ◽

Lag Time ◽

Strain Sensors ◽

Dynamic Strain ◽

Shake Table ◽

Vibration System ◽

Strain Wave ◽

Low Frequency Vibration ◽

Working Frequency

This paper investigates the lag time and the highest working frequency of Fiber Bragg Grating strain sensor in which strain wave transfers to bare FBG by analyzing the transmit course of the strain wave. The results show that the FBG strain sensor is applicable to the measurement of low frequency vibration in engineering. As its application, FBG strain sensors are used in the shake table test of offshore platform model and show good capability in measuring the dynamic strain of vibration system with low frequency.

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