Yieldable Prop with Yieldable Insert

A method of supporting a mine roof comprising:

• positioning a mine prop within a mine opening, the mine prop comprising a first pipe having first and second ends, a second pipe having first and second ends, and a yield member secured to the second pipe, the second pipe received in the first pipe;
• extending the second pipe towards a roof of the mine opening;
• and
• plastically deforming the yield member when the mine prop receives a predetermined load from the roof of the mine opening.

A mine prop comprising:

• a first pipe having a first end and a second end;
• a second pipe having a first end and a second end, the second pipe slidably received in the first pipe;
• a centering pipe received by the first end of the second pipe;
• and
• a yield pipe having a first end and a second end, the yield pipe receiving the centering pipe, the second end of the yield pipe engaging the first end of the second pipe, the yield pipe configured to yield before the second pipe when the mine prop is placed under a predetermined load.

A mine prop comprising:

• a first pipe having a first end and a second end;
• a second pipe having a first end and a second end, the second pipe slidably received in the first pipe;
• a washer received within the second pipe and defining at least one passageway, the washer comprising a polymeric material;
• and
• particulate matter positioned within the second pipe, the second pipe having a retracted position and an extended position relative to the first pipe, the particulate matter is movable from the second pipe to the first pipe when the second pipe transitions from the retracted position to the extended position.