Method for determining foundation pit support slope shape and shotcrete quantity based on BIM (Building Information Modeling)

The invention relates to a method for determining the shape of a foundation pit supporting slope and the shotcrete anchor amount based on BIM. The method comprises the steps that layer classification is conducted on shotcrete anchor faces of different areas and different gradients in a foundation pit construction drawing through a CAD system; then, the model is imported into a BIM system, the foundation pit supporting process sequence is simulated for the first time, and side lines at the overlapping positions of all the sections are optimized; secondly, primary foundation pit supporting modeling is conducted, the foundation pit supporting process sequence is simulated again, the supporting sloping coefficient is locally adjusted, foundation pit supporting is segmented and layered, and a three-dimensional model of a plurality of supporting faces and a plurality of construction interface layers is built; the BIM is used for releasing each area and each layer of side slope, and the supporting position of a regi