Field study method for indoor air of linear underground facilities

The article describes the approach to the organization of field studies of air and thermal regime of underground structures on the basis of experiments carried out in the underground channels with sufficient maintenance

Application of Multi-Criteria Decision Analysis for Choice Geokhods Cutting Head

The article deals with the choice of cutterheads for Geokhod in the early development stages. Early development stages are characterized by the lack of quantitative characteristics, such as cutting forces, weight, feed forces, etc. In this case, the choice is made on the accordance of the cutterheads with the requirements for them. Under such conditions were determined the most appropriate method of multi-criteria analysis for the choice of the cutterheads – “ELECTRE III”. The results of the use of this method are established the most fully meet the requirements cutter heads: a rotary, drum, and head with fixed heads

Estimation of the Overall Dimensions of the Outer Elements of Geokhod

The article considers the question of determining the possible dimensions of the outer grooves of different diameters Geokhods. Taking into account rock properties and destination of outer elements of Geokhod set the height of the outer grooves. The thickness of the outer element is determined by the conditions of their required strength. The set values can be used to develop circuit solutions of outer cutting drums of Geokhod

Determination of contact temperature on cutting disc during rock destruction

During the destruction of rocks by disc cutters the question of their operation without water cooling is arising. To implement this an approach to determining the temperature of the disk cutter is considered in the article. The calculations of heating of the disc cutter with various geometric parameters (diameter, sharpening angles, blunting edge radius) and geological conditions under different cutting conditions (cutting depth) are presented. The disc cutter temperature and comparison with a critical one is given. The results allow to increase wear resistance and thereby determine the modes of operation in which forced cooling of the cutting disc is not required