Forecasting suffusion deformation in dispersive soils

Keywords: suffusion, Dnipro loessial soil, fractal


Suffusion is a dangerous geological process accompanied by the formation of sinkholes, deformations of buildings and structures. Forecast of suffusion processes is a complex scientific problem since it is required to predict a complex process of the formation of new soil structure experiencing certain changes while interacting with the flow. Durin the period of 12.02.2018 – 13.04.2018, a sample of Dnipro loessial soil was filtered with the salt solution in Darcy device. The experi- ment was carried out at the SRI of Geology of Oles Honchar DNU; it is the continuation of the research dealing with experimental study of the dispersive soils as complex natural systems. To study suffusion process in loessial soils, analysis of microaggregate and granulometric composition of a sample of undisturbed structure of Dnipro loessial horizon taken in Tunelna ravine outcrop has been performed. The sample was studied in different states: natural and changed (due to long-term filtration) ones. Results of the use of in- novative method to determine values of the function of particle distribution in terms of their mass and calculations of fractal dimension of the function basing upon the microaggregate analysis have made is possible to forecast values of porosity coefficient and volumetric deformation corresponding to the new quality standards of a complex system – dispersive soil in the state of complete microaggregate disturbance. Algorithm of the microaggregate composition analysis according to the methodology (Riashchenko, 2010) is in the fact that the sample experiences different methods of preparation – thus, evaluations of soil dispersivity are different. Basing upon the obtained results, values of microaggregate coefficient have been calculated, and data on the number of aggregates and initial particles have been taken. It has been determined that the basic size of the aggregates is 0.01-0.005 mm; there is a fewer share of the aggregates of 0.05-0.01 mm; and the fewest share of the aggregates is represented by fine fraction. That indicates the changes in microaggregate composition of soil due to the carrying out of fine fractions and the disturbance of larger aggregates. Calculations of the values of volu- metric soil deformation due to long-term salt solution filtration emphasize the fact that within the zones of technogenic contamination, possible aggregate decay due to chemical effect will result in the formation of structure with denser particle packing, i.e. compaction. If loessial layers with the state changed due to salt solution filtration are subject to mechanical effect, drastic soil loosening and loss of soil stability may be observed.

Author Biographies

T. P. Mokrytskaya
Oles Honchar Dnipro National University
L. О. Nosova
Oles Honchar Dnipro National University


1. Gudehus G., Touplikiotis A., 2018. On the stability of geotechnical systems and its fractal progressive loss Acta Geotech. 13: 317. https://doi. org/10.1007/s11440-017-0549-x
2. Ziani H., Abbèche, K., Messaoudene, I. et al., 2019. KSCE, J Civ Eng 23: 1028. s12205-019-0051-0
3. Jafari F. K., Asgari M. S., Pishkoo А. The Fractal Calculus for Fractal Materials, 2019. Fractal Fract, 3(1), 8;
4. Khuzhaerov B. J., 1994. A model of multicomponent grouting and suffosion filtration Eng Phys Thermophys, Vol. 66, Issue 4, pp. 373–379.
5. Liu Y., Gong Y., Wang X. et al., 2013. Volume fractal dimension of soil particles and relationships with soil physical-chemical properties and plant species diversity in an alpine grassland under different disturbance degrees Arid Land 5: 480.
6. Lu S., Tang, H., Zhang, Y. et al., 2018. Bull Effects of the particle-size distribution on the micro and macro behavior of soils: fractal dimension as an indicator of the spatial variability of a slip zone in a landslide Eng Geol Environ 77: 665. https://doi. org/10.1007/s10064-017-1028-1
7. Mokritskaya T.P., , Tushev A.V., Samoylich K.A. et al., 2019. Bull Eng Geol Environ 78: 3729. https://
8. Nikiforov A.I., , 2000. J Modeling of suffosion of water- bearing strata Eng Phys Thermophys 73: 959. Vol. 73, Issue 5, pp. 959–965 BF02681587
9. Wang G. L. J., Xuan L., Xinhui L., Xiaosai L., Yaqiong R., Jing W., 2018. Liming Dong Partitioning and geochemical fractions of heavy metals from geogenic and anthropogenic sources in various soil particle size fractions. Geoderma,Vol. 312, 15 February, Pages 104-113. https://doi. org/10.1016/j.geoderma.2017.10.013
10. Wang J., Zhang M., Bai Z. et al., 2015. Multi-fractal characteristics of the particle distribution of reconstructed soils and the relationship between soil properties and multi-fractal parameters in an opencast coal-mine dump in a loess area. Environ Earth Sci 73: 4749. s12665-014-3761-0
How to Cite
Mokrytskaya, T., & Nosova, L. (2019). Forecasting suffusion deformation in dispersive soils. Journal of Geology, Geography and Geoecology, 28(3), 504-510.