Deep and soft soil foundations are common in coastal port sites. Therefore，the negative impact of ground surcharge loads on pile foundations of buildings must be considered while constructing workshops with large-span steel structures on such sites. The use of rigid floor piles is one of the solutions. In this paper，we simulate the surcharge loads and foundations by the finite element analysis software and systematically analyze the stability of the coal blending shed foundation and the rigid floor pile foundation. The result reveals that the coal blending shed with the rigid floor piles meets the safety requirements.