Geothermal-based self-compensating expansion shell rock bolt

A geothermal-based self-compensating expansion shell rock bolt, comprising:

• a sleeve, a piston rod, a push member, and an expansion member, wherein the piston rod is slidably connected within the sleeve;
• the expansion member is connected to the sleeve;
• the push member is connected to the piston rod and configured to act on the expansion member;
• a push hole is defined in the sleeve for the push member to extend out therethrough;
• a cylinder is disposed within the sleeve;
• an end of the piston rod extends into the cylinder;
• the end of the piston rod that extends into the cylinder and an inner wall of the cylinder define an expansion cavity;
• and a phase change material is disposed within the expansion cavity;
• and when heated and vaporized, the phase change material pushes the piston rod to move, whereby the piston rod slides through the push member and pushes the expansion member to expand outwards from inside the sleeve.