Seepage evolution mechanism of foundations in reclamation areas on the basis of digital image technology

With the development of urbanization, reclamation has become an important means to expand urban space. Characteristics, such as fill composition and hydraulic coupling during reclamation, affect the stability of foundations in reclamation areas. Therefore, accurate identification of the composition of the reclamation foundation structure plays an important role in foundation stability control and risk prevention management of the reclamation area. To realize accurate detection and three-dimensional modeling technology for underground spaces in reclamation areas, the following research is carried out in this paper: (1) The basic steps of reclamation are analyzed. Digital image technology is used to scan and reconstruct fractured rock masses in reclamation areas. As the model control point, a three-dimensional numerical model construction method for complex geological structures in underground spaces is proposed. A numerical analysis model that objectively reflects the characteristics of a reclamation area is constructed to explore the stability of underground space and the fracture formation and evolution factors. (2) Through the construction of a numerical model of an underground rock fracture network to carry out numerical simulations, the fracture evolution mechanism under the action of hydraulic coupling and the deformation characteristics of rock masses during reclamation are discussed, and a method for improving the stability of underground spaces in reclamation areas is proposed. The results show that underground space in a reclamation area easily leads to crack evolution and permeability changes under the dual coupling of stress erosion, which can induce land subsidence and even ground subsidence. By controlling the particle size via roller-compacted concrete technology, the stability of foundations can be effectively improved, which provides solid theoretical support and practical guidance for the construction of reclamation areas in coastal cities.