The reasonable value about the construction load around the foundation pit is related to the security and economy of supporting structure. The construction load contains the material loads and mechanical movement load. These two should not be repeated. When the construction load is 20 kPa, it can generally meet the temporary requirements on the construction load around the foundation pit, and at the same time, it also can let the construction vehicles walk. By the way, the load effect should be take special treatment when the construction vehicle is working.