Engineering-Geology Zoning and Risk Assessment of Hazards in Tianjin Central Fishing Port

Abstract

For the coastal cities of China, hydraulic reclamation has become an effective way to solve the problem of land resources shortage. Some cities select mucky soil dredged from channels instead of sea sand and river sand with high cost. However, the muck has a lot of adverse engineering characteristics, such as high natural water content, high void ratio, high compressibility and low bearing capacity. Therefore, engineering geological zoning and risk assessment are essential to the subsequent design and construction. Under the background of Tianjin central fishing port project which is a typical reclamation project, this paper conducts engineering-geology zoning with fully considering the requirement of the bearing capacity and settlement in this project. The following zoning principles are established: (1) the site is zoned based on the uniformity of soil layer; (2) the site is zoned based on the distribution of soft soil. The existence, category and thickness of soft soil are taken into account respectively. Then, based on the zoning map, this paper also conducts risk assessment of potential engineering-geology hazards in these zones. At the same time, risk assessment is verified by calculating the settlement of soft soil.