How can I model this vertical plate anchor and also what type of connection used at its both ends (for anchoring plate in soil or retaining wall e.g bolts or grouting)
A ground anchor such as a vertical plate anchor can be modeled as a combination of a node-to-node anchor and a plate. The horizontal part can be modelled as a node-to-node anchor and the vertical part can be modeled as a plate. Node-to-node anchors form a spring connection between two geometry points. More information on node-to-node anchors can be found at the following link: Node-to-Node anchors as an alternative for Fixed-End anchorsThe part of the anchor embedded in the retaining wall can be modeled using an embedded beam row to model slippage. An embedded beam is a structural object (such as a pile, rock bolt or grout body) composed of beam elements that can be placed in arbitrary direction in the sub-soil and that interacts with the sub-soil by means of special interface elements. The interaction may involve a skin resistance as well as a foot resistance. The skin friction and the tip force are determined by the relative displacement between the soil and the pile.More information on the connection type between node-to-node anchors and embedded beams and plates can be found in the PLAXIS 2D Reference manual.