Impact of water saturation effect on sedimentary rocks strength properties

User Rating:  / 0
PoorBest 

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.

References.

1. Li, P., & Qian, H. (2018). Water in Loess. In: Encyclopedia of Sustainability Science and Technology. Springer. https://doi.org/10.1007/978-1-4939-2493-6_968-1.

2. Babets, D. (2018). Rock Mass Strength Estimation Using Structural Factor Based on Statistical Strength Theory. Solid State Phenomena, 277, 111-122. https://doi.org/10.4028/www.scientific.net/SSP.277.111.

3. Wong, L. N. Y., Maruvanchery, V., & Liu, G. (2016). Water effects on rock strength and stiffness degradation. Acta Geotech, 11, 713-737. https://doi.org/10.1007/s11440-015-0407-7.

4. Liu, B., Sun, Y., Wang, B., Han, Ya., Zhang, R., & Wang, J. (2020). Effect of water content on mechanical and electrical characteristics of the water-rich sandstone during freezing. Environmental Earth Sciences, 79, 236. https://doi.org/10.1007/s12665-020-08991-8.

5. Suknev, S. V. (2016). Determination of the static modulus of elasticity and Poisson’s ratio of rocks with changes in humidity. Mining information-analytical bulletin, 7, 108-116.

6. Zhang, D., Pathegama Gamage, R., Perera, M. S. A., Zhang, C., & Wanniarachchi, W. A. M. (2017). Influence of Water Saturation on the Mechanical Behaviour of Low-Permeability Reservoir Rocks. Energies, 10, 236. https://doi.org/10.3390/en10020236.

7. Cai, X., Zhou, Z., Liu, K., Du, X., & Zang, H. (2019). Water-Weakening Effects on the Mechanical Behavior of Different Rock Types: Phenomena and Mechanisms. Applied Sciences, 9(20), 4450. https://doi.org/10.3390/app9204450.

8. Liu, X., Zhang, M., Zhang, H., Jia, Y., & Shan, H. (2017). Physical and mechanical properties of loess discharged from the Yellow River into the Bohai Sea, China. Engineering Geology, 227, 4-11. https://doi.org/10.1016/j.enggeo.2017.04.019.

9. Shashenko, O., Shapoval, V., Kovrov, O., Skobenko, A., Tiutkin, O., Babii, K., …, & Slobodyanyuk, S. (2019). Determining the influence of physical nonlinearity of soil strength properties on the estimated base resistance. Eastern-European Journal of Enterprise Technologies: Applied mechanics, 6/7(102),19-27. https://doi.org/10.15587/1729-4061.2019.184946.

10. Shapoval, V., Shashenko, O., Hapieiev, S., Khalymendyk, O., & Andrieiev, V. (2020). Stability assessment of the slopes and side-hills with account of the excess pressure in the pore liquid. Mining of Mineral Deposits, 14(1), 91-99. https://doi.org/10.33271/mining14.01.091.

11. Sadovenko, I. O., Puhach, A. M., & Dereviahina, N. I. (2019). Investigation of hydrogeomechanical parameters of loess massifs in conditions of technogenic underflooding and development of technical recommendations for strengthening of bases of foundations. Journal of Geology, Geography and Geoecology, 28(1), 173-179. https://doi.org/10.15421/111918.

12. Yates, K., & Fenton, C. (2017). A methodology for examining soil-water characteristics of Banks Peninsula Loess, NZ. In: G. J. Alexander & C. Y. Chin (Eds.) Proc. 20 th NZGS Geotechnical Symposium. Napier.

13. Sobko, B., Drebenstedt, C., & Lozhnikov, O. (2017). Selection of environmentally safe open-pit technology for mining water-bearing deposits. Mining of Mineral Deposits, 11(3), 70-75. https://doi.org/10.15407/mining11.03.070.

14. Tereshchuk, R. M., Khoziaikina, N. V., & Babets, D. V. (2018). Substantiation of rational roof-bolting parameters Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (1), 19-26. https://doi.org/10.29202/nvngu/2018-1/18.

15. Solodyankin, O., Kovrov, O., & Ruban, N. (2015). Investigation of physical and mechanical properties of subsiding soils at the Yevpatoriyskaya ravine located in the City of Dnepropetrovsk. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (1), 15-20.

16. Sdvyzhkova, O., Gapeiev, S., & Tykhonenko, V. (2015). Stochastic model of rock mass strength in terms of random distance between joints. In: New Developments in Mining Engineering, (pp. 299-303). CRC Press. https://doi.org/10.1201/b19901-53.

Visitors

3213303
Today
This Month
All days
371
37326
3213303

Guest Book

If you have questions, comments or suggestions, you can write them in our "Guest Book"

Registration data

ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

Contacts

D.Yavornytskyi ave.,19, pavilion 3, room 24-а, Dnipro, 49005
Tel.: +38 (056) 746 32 79.
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
You are here: Home About the journal EngCat Archive 2020 Contens №4 2020 Impact of water saturation effect on sedimentary rocks strength properties