Quantitative assessment of dolomite powder suffusion resistance in karstological prognosis

Introduction. In construction, a large number of objects are erected in conditions where the foundation consists of carbonate rocks that are destroyed to the state of powder. The paper provides materials on the planning, preparation and conduct of a laboratory experimental test for dolomite powder lying at the base of a building in the Kazan. The experiment is presented to quantify the suffusion resistance of powder.

Materials and methods. The study of the suffusion resistance of dolomite powder was carried out using a special filtration-suffusion device. When planning and preparing the experiment, all the main factors were simultaneously taken into account. For mechanical suffusion, these are the physical and filtration characteristics of the rock, its stress-strain state (SSS) and also the volume of the receiving zone for the suffusion products carried out by the filtration flow. For chemical suffusion these are the chemical composition and condition of the rock, the chemical composition and speed of water movement.

Results. It was established that dolomite powder is not subject to the dissolution process, therefore it is classified as eluvial soil and not as karst rock. In terms of mechanical suffusion stability, a comparison was made of the results of analytical solutions and experimental tests, according to which in the first case the dolomite powder is suffusion, and in the second — practically non-suffusion.

Conclusions. The construction site is classified as non-hazardous in terms of karst and karst-suffusion. At the same time, mechanical suffusion not related to karst cannot be excluded. When assessing the suffusion resistance of dolomite powder, it is recommended to use the rate of mechanical or complex (chemical-mechanical) suffusion instead of the rate of rock dissolution. In the future it is recommended to use the obtained value when predicting the size of suffusion deformations.

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