What shoring method is utilized when access to the base of the wall is obstructed?

The split raker shore is the correct method to use when access to the base of a wall is obstructed. This technique involves placing shoring elements at angles to support the wall while distributing the weight and forces exerted on it. It is especially effective because it allows stability and support without needing direct access to the foundation or base of the wall. This method is advantageous in situations where conditions prevent a clear approach, such as debris or other obstacles that impede the establishment of traditional shoring methods.

Other techniques, while useful in different scenarios, typically require a more accessible area at the base of the wall. The cross-brace shore, diagonal brace shore, and vertical post shore may not be as effective in situations where obstructions prevent direct access, thus making them less suitable in this context. The split raker shore, by allowing for support from an angle and not needing direct base access, is ideally suited for challenging rescue and recovery operations.