Prokhorets L.V. On the informativeness of the shock pulse method for controlling the geocomposite constructions strength

Деталі
Батьківська категорія: Геотехнічна механіка, 2019
Категорія: Геотехнічна механіка, 2019, № 145

Geoteh. meh. 2019, 145, 77-84

https://doi.org/10.1051/e3sconf/201910900072

On the informativeness of the shock pulse method for controlling the geocomposite constructions strength

1ProkhoretsL.V.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

 

UDC  

Language: English

Abstract.

This article shows the possibility of using the shock impulse method widely used in the building industry for the control of above-ground concrete structures in relation to elements of underground geocomposite protective constructions. Instead of amplitude, it is proposed to use the duration of the shock pulse as an informative parameter. This is explained by the fact that, with the constancy of the projectile design and the properties of the media contacting upon impact, the duration of the impact, depending on the speed of the impactor before the impact, will change very slightly, much less than the shock pulse amplitude. Thus, stabilization of the impact force is not required, which greatly facilitates the task. As a result of experimental studies performed in the laboratory on various mortar mixtures that harden, it was established that there is a close correlation relationship between two data arrays: the values of the shock pulse duration and the uniaxial compression strength. It was experimentally established that the power-law dependence of the set informative parameter decreases with an increase in the strength limit of the material under uniaxial compression. The reliability of the obtained regression equations is in the range of 0.82 - 0.9. The closest correlation between the strength characteristics and the duration of the shock pulse is observed for concrete. The possibility of assessing the concrete strength properties using the proposed method variant was investigated. Samples of hydraulic concrete were taken for testing, from which cubic-shaped samples with a rib of 100 mm were made. Unlike concrete, in the study of hardening mixtures, a range with low strength values was covered. However, in this case, a correlation was found between the strength and duration of the shock pulse. This shows the possibility of using the shock pulse method in the new version, with the previously unused informative parameter - the shock pulse duration for assessing the strength of mortar mixes that harden, which are widely used to create geocomposite constructions. It is shown, that the shock pulse method good recommending to yourself for strength properties assessment of materials in the natural conditions.

Keywords: shock impulse method, compression strength, geocomposite constructions.

 

References

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About the author

Prokhorets Liliia Victorivna, Candidate of Technical Sciences (Ph.D.), Junior Researcher in Rock Mechanics Department, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, Ця електронна адреса захищена від спам-ботів. вам потрібно увімкнути JavaScript, щоб побачити її.