On the signs of relative displacement and their use in setting workings on a displaced wing of a seam

Abstract

When developing disturbed areas of coal deposits, it is often necessary to deal with the assignment of exploratory or opening mine workings on a displaced wing of the seam. When a fault device encounters mine workings driven along the seam, one wing of the seam, carrying these workings, is a known wing in the solution of the specified problem, and the other is a displaced wing relative to the known or displaced wing. The solution of this and other geometric problems when working on disturbed areas - before exploration or opening of the sought (displaced) wing - is based on the assumption that the displaced wing is parallel to the known wing. Before solving the problem, it is necessary to establish the type of displacement encountered and select the direction of the working opening the displaced wing. To do this, it is necessary to know the vector of the "true" relative displacement of the displaced wing or the amplitude of the displacement in a certain direction, established by exploration. Strokes, furrows, potholes and crush halos on the plane of the fault device, as well as wing turns near cracks can serve as signs indicating the direction of movement of the "lost" wing, and can be used to determine the type of displacement and select the direction that opens the desired wing of the working.