Monitoring device for internal deformation and fine particle loss of railway subgrade

A monitoring device for internal deformation and fine particle loss of a railway subgrade, comprising an internal damage monitoring device arranged in a subgrade ballast layer, wherein the internal damage monitoring device is connected to a resistance acquisition instrument through a wire;

• the resistance acquisition instrument is in wireless connection with a resistance signal receiver,
• wherein the internal damage monitoring device comprises two loading plates that are symmetrically arranged up and down;
• a geomembrane bag is connected between the two loading plates;
• a monitoring device is arranged in the geomembrane bag;
• the monitoring device comprises multiple intelligent conductive coarse particles that are arranged in a superposed manner in sequence;
• a gap between two adjacent intelligent conductive coarse particles is filled with fine sand;
• multiple measurement points are arranged on the monitoring device;
• conductive adhesive tapes are arranged at the positions of the measurement points;
• the conductive adhesive tapes are connected to the intelligent conductive coarse particles located at the measurement points;
• the conductive adhesive tapes are connected to the resistance acquisition instrument.