To obtain the deep displacement of the coal seam in the working face,multi-point displacements were installed in the coal seam, but the installation of multi-point displacement is differen tunder different geological conditions. This paper is based on the splitting and merging of 71 coal and 72 coal in Huaibei Mining（Group） Co., Ltd., and analyzes properties of the roof andcoal in the 72 coal of the lower coal seam of bifurcation area, and calculates the damage depth of the floor in the process of 71 coal mining. The multi-point displacement meter installation is often challenged by hole collapse, stuck pole and broken installation rod in 72 coal of the soft coal seam of bifurcation area, as a result, the base points can’t be installed in the specified location. In view of this, this paper adopts a new anchor cable mounting rod which can install the whole base points to the specified location without stuck pole or broken mounting stem. All the basic displacement data can be obtained, and the law of mine pressure appearance in stope and tunnel can be accurately controlled, which can be used to maintain the stability of roadway and the safety of stope.
展开▼
