System and method for monitoring bearing compression rate of filler in coal mine gob area

A method for monitoring bearing compression rates of fillers in a gob area of mining a coal seam, comprising:

• providing a ground information processing system, a ground vibration source control system, and a ground monitoring system which are all disposed on a ground above fillers to be tested in the gob area, wherein the ground monitoring system comprises wave detectors;
• after filling the gob area with the fillers and compacting the fillers in the gob area using a 2 Mpa pressure, monitoring a thickness of the fillers, wherein the monitoring the thickness of the fillers comprises:
• impacting the ground by the ground vibration source control system to generate a vibration, such that an elastic wave of the vibration is transmitted to the fillers;
• receiving reflected waves of the elastic wave from the fillers by the ground monitoring system, and converting the received reflected waves into electrical signals by the wave detectors of the ground monitoring system;
• and
• transmitting the electrical signals to the information processing system for analyzing and obtaining the thickness of the fillers;
• continuing the monitoring to obtain different thicknesses of the fillers, until the thickness of the fillers do not change as stabilized fillers;
• and
• recording the thickness of the fillers in the gob area after being initially filled and compacted as h1, recording the thickness of the stabilized fillers as h2, and calculating bearing compression rates of the fillers by the ground information processing system according to a bearing compression rate calculation formula (h1−h2/h1,
• wherein
• the ground vibration source control system adjusts a vibration amplitude of a vibration source to generate the vibration according to a depth of the fillers;
• and
• the thickness of the fillers is obtained based on a depth that the elastic wave of the vibration transmitted from the vibration source reaches and the depth is determined according to a wave energy consumption, wherein the depth gradually increases the reflected waves gradually attenuate.