ИССЛЕДОВАНИЕ ВЛИЯНИЯ ФОРМЫ РЕЖУЩЕЙ КРОМКИ НОЖЕВОГО ИСПОЛНИТЕЛЬНОГО ОРГАНА ГЕОХОДА НА ЭНЕРГОЕМКОСТЬ РАЗРУШЕНИЯ ПОРОДЫ ЗАБОЯ

Abstract

The increase in the population creates prerequisites for the use of new undeveloped places, which include underground space. The development of underground space is associated with the construction of underground structures. A promising technology for the construction of underground structures is geokhodnaya. The basic element of which is a geokhod. As a rule, structures are built at shallow depths, which are characterized by rocks with a strength coefficient up to f = 1 on the scale of Professor M.M. Protodiakonov. Traditionally, the sinking of workings in these rocks is carried out by knife executive bodies. During the development and executive body design, one of the main indicators for evaluating its work is the energy intensity of the face rock destruction. As a result, a promising direction is to study the influence of the shape of the cutting edge of the knife executive body of the geokhod on the energy intensity of the destruction of the face rock. The article presents variants of schematic solutions of the geokhod knife executive body with a different shape of the knife cutting edge, developed on the basis of a functional and constructive approach to the development of constructive solutions and requirements for the geokhod executive bodies. It is established that the geokhod executive body geometric parameters, depending on the knife cutting edge shape, include: the angle of inclination of the knife with an inclined shape of the knife cutting edge; the radius of curvature of the knife cutting edge with a semi-convex and knife convex shape. The previously developed method of determining the face rock destruction energy intensity by the knife executive body of the geokhod is presented. For a promising direction of studying the influence of the geokhod knife executive body cutting edge shape on the energy intensity of the face rock destruction, the article provides initial data, which include the physical and mechanical properties of rocks and geokhod geometric parameters. As a result of the study, it was found that: the angle of inclination of the knife to the plane perpendicular to the axis of rotation does not significantly affect the face rock destruction energy intensity by the geokhod knife executive body; an increase in the knife cutting edge radius of curvature by the executive body of the geokhod leads to an increase in the energy intensity of the face rock destruction; given the physical and mechanical properties of the destroyed rock and the geometric parameters of the geokhod, it was found that with a knife cutting edge semi-convex shape and rкр = rг, the energy intensity of the face rock destruction is 1.4% less than with a straight shape. With a convex shape of the knife cutting edge and rкр = rг /2, the energy intensity face rock destruction is 8.3% less than with a straight shape.