Authors: V.A. Shalamanov, S.N. Shabaev

Title of the article: The use of fragmented rocks for the construction of road surfaces

Year: 2019, Issue: 4, Pages: 23-28

Branch of knowledge: 25.00.20 Geomechanics, rock destruction by explosion, mine aerogasdynamics and mining thermal physics

Index UDK: 622.012.3:625.072

DOI: 10.26730/1999-4125-2019-4-23-28

Abstract: In 2019, in Kuzbass more than 150 million tons of coal will be extracted by the open-pit mining and more than 1 billion tons of carboniferous rock will be disturbed and transported to dumps and partially stored on agricultural lands. Motor vehicles are used to move the rock mass (65% of transportation), in the total cost of coal mining transportation costs amount to 70%. The cement concrete and asphalt concrete traditionally used for the construction of temporary technological roads are not economically feasible to use, and the use of fragmented overburden rocks will reduce the cost of coal mining and improve the ecological situation in the region. The issue of using crushed rocks from coal mining for the construction of coatings on technological roads has not yet been studied sufficiently. Based on theoretical studies of the optimal structure of granular materials and taking into account the theory of the probability of particle packing, the optimal particle size distribution of fragmented rocks is substantiated for the use in the construction of technological roads.  To ensure the performance of technological road pavements constructed from crushed rocks during the specified service life, in addition to particle size distribution, other physical and mechanical characteristics are justified, the main of which are grades of crushing and frost resistance. It has been established that crushability indices in a water-saturated state increase non-linearly with an increase in the propagation velocity of longitudinal ultrasonic waves. It has been proved that coarse-grained sandstones can be used to lay the foundations of technological roads without restrictions, and for coatings - with the propagation velocity of longitudinal ultrasonic waves of at least 3600 m / s. Medium-grained and fine-grained sandstones, as well as fine-grained siltstones can be used to lay the foundations of technological roads, if the propagation velocity of longitudinal ultrasonic waves in them is at least 3500 m / s. It has been established that the required grade for frost resistance of sandstones and siltstones increases linearly with increasing service life of technological roads and for the conditions of Kuzbass F15 with a service life of up to 2, F25 - from 2 to 3, F50 - from 3 to 7 and F100 - more than 7 years.

Key words: Fragmented rock technological road coating base grading crushability frost resistance

Receiving date: 07.10.2019

Approval date: 01.01.1970

Publication date: 19.12.2019

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