Bag type recoverable tension-compression composite anchor rod and bearing capacity calculation method thereof

The invention discloses a bag type recoverable pressure anchor rod which comprises an anchor head anchorage device, a rod body, a bearing body and an anchoring body, the rod body comprises a steel strand and a protective sleeve, the protective sleeve is connected to the periphery of the steel strand in a sleeving mode, the bearing body is located at the tail end of the anchor rod body and connected with the steel strand, and the anchoring body comprises a cement soil anchoring body and a cement paste anchoring body. The cement-soil anchoring body is formed by cement paste and surrounding soil through a high-pressure jet grouting technology, and the cement paste anchoring body is formed by injecting the cement paste into a bag wrapping the periphery of the rod body through a reserved grouting pipe. According to the anchor rod, the shear stress distribution of an anchoring body and a soil body interface is more uniform, the cement soil anchoring body is effectively prevented from being pressed and damaged, and