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Impact of water saturation effect on sedimentary rocks strength properties

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Category: Contens №4 2020

Last Updated on 05 September 2020

Published on 30 August 2020

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Authors:

D. V. Babets, orcid.org/0000-0002-5486-9268, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. S. Kovrov, orcid.org/0000-0003-3364-119X, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S. K. Moldabayev, orcid.org/0000-0001-8913-9014, Satbayev University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

R. M. Tereschuk, orcid.org/0000-0003-4509-2511, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

D. O. Sosna, orcid.org/0000-0002-0521-8661, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (4): 076-081

https://doi.org/10.33271/nvngu/2020-4/076

повний текст / full article

Abstract:

Purpose. To identify some regularities of reduction in strength of loamy soils and weak sedimentary rocks that are typical for Western Donbas by water saturation condition for assessment of their stability in geotechnologies and forecasting geohazards.

Methodology. The paper presents two techniques of experimental testing for sedimentary rocks that allow determining their strength properties under the condition of water saturation. Rock samples of sandstones, mudstones, and siltstones after artificial saturation with mine water were tested on a KL 200/CE hydraulic press to determine the uniaxial compressive strength value. The method for determining the physical-mechanical properties for soft loamy rock samples under different water saturation using PS‑10 single-plane shearing tester was used.

Findings. Based on the results of compression tests, strength characteristics are obtained for samples of sandstones, mudstones, and siltstones, in particular, the values of uniaxial compression strength at various degrees of water saturation. Statistical processing of the obtained experimental data was applied. A relative variation in the values of compressive strength was established for various rates of water saturation; regression dependences of the strength loss for sedimentary rocks depending on the water content in rock samples were plotted. The values of cohesion C and the angle of internal friction φ for soft loamy rocks are obtained depending on water saturation.

Originality. It was established that the relative variation of the uniaxial compressive strength increases with increasing water content in sedimentary rock samples. The most intense decrease in the strength of sandstones, mudstones, and siltstones samples occurs with increasing water content from 1 to 2 %. In a water-saturated state, the strength of some sedimentary rocks under conditions of Western Donbas decreases by 1.5–2.5 times. The critical values of the strength properties of soft loamy rocks are established depending on water saturation, at which deformation processes are initiated: for light yellow loess loams – C = 17 kPa and j  14°; for yellow-brown dense loams – C = 29 kPa and j = 17°.

Practical value. Correction coefficients for water saturation were obtained to determine the estimated physical and mechanical characteristics of sedimentary rocks of Western Donbas, which allows predicting geomechanical processes in the rock mass and determining the parameters of geomechanical systems. The obtained values of cohesion and angle of internal friction for loamy rocks depending on water saturation allow predicting stable parameters of open-pit slopes and dumps.

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