Finite-element Simulation And Analysis Of Foundation Pits

As the exploitation of underground space and the construction of high-rise in urban, a large number of deep foundation pits have appeared lately. Its scale and depth increase constantly. Urban deep foundation pits are generally surrounded with dense buildings. So their working space is very narrow, especially when they are close to the foundations of adjacent buildings or structures. Applying the traditional design theory (strength-controlling design) and routine construction technology, there is an inevitable difficulty about protecting surrounding buildings or structures in construction. Many scholars, engineers and technicians have already worked a lot in the displacement-controlling design of deep foundation pits recent years, however, difficulty remains to be solved in correlation among the deformation of the retaining structures, soil deformation around the excavations and the displacements of adjacent structures.Deep foundation pits; bracing structures and adjacent structures are studied as an integrated system in this paper. The construction process of the typical deep foundation pit which is under the typical geological conditions of Tianjin area is simulated and analyzed with the aid of large-scale software-ABAQUS. The rebounding of foundation pits internal soil, the settlement of outer soil, the displacement of supporting structures and adjacent subways are analyzed because the foundations pits. This paper reveal the law of displacements of bracing structures, surrounding soil settlements, different settlement and absolute settlements of adjacent structures that may appear in the process of excavation by steps. Finally, the conclusions that are valuable for designing foundation engineering are found.