Authors: A.V. Uglyanitsa, T.N. Santalova

Title of the article: Sand-cement cushions for preparation of the bases of mining buildings and structures

Year: 2023, Issue: 3, Pages: 91-99

Branch of knowledge: 2.8.8 Geotechnology, mining machines

Index UDK: 622.014.5:624.153.531

DOI: 10.26730/1999-4125-2023-3-91-99

Abstract: The possibilities of using sand and soil-cement cushions in the construction of mining buildings and structures on man-made, yielding, loose, permeable surface soils are analyzed. It is established that the use of these cushions as a replacement of man-maid foundation soils in the construction of mining buildings and structures is inefficient. To prepare the bases of mining buildings and structures that are built on man-made loose soils, it is proposed to use sand-cement cushions, the manufacturing technology is as follows - man-made loose soil is removed to a given depth; artificial sand made of finely ground overburden rock is placed in the formed pit and then the sand is mixed with cement binder in the pit using Shallow Soil Mixing technology. Laboratory experimental studies were carried out to determine the rational composition of sand-cement cushions. It is established that two-component artificial sand from ground overburden sedimentary rock with a uniaxial compressive strength Rc ≈ 35-45 MPa, containing 25% of the "−0.63 + 0.315" sand fraction and 75% of the "−0.315" fraction when mixed with cement mortar with a cement-water mass ratio C:W = 1:0.5 makes it possible to produce a solid cushion to ensure trouble-free operation of mining buildings and structures. The production of sand from overburden rocks will also make it possible to utilize rock dumps and, as a result, improve the environmental situation at the mining enterprise and the territory adjacent to it.

Key words: mining building man-made soil overburden sand Portland cement cushion

Receiving date: 07.03.2023

Approval date: 15.06.2023

Publication date: 30.06.2023

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