Research On Three-dimensional Effect Of Deep Pit

Ordinarily two-dimensional cross-section design is somewhat considered safer than three-dimensional analysis, but researches show that for the deep foundation problems, because of the inevitable limitations and other factors, two-dimensional analysis, especially in the pit corner, is difficult to do everything. The earth pressure distribution at pit corner is with conventional understanding of a certain bias because of the presence of pit corner effect. Especially in the current design, there are some blind selections of models and types of earth pressure. The distribution of earth pressure at pit corner, especially the active earth pressure, is not as we usually think. Actually it is as similar to the phenomenon of stress concentration, the active earth pressure is more concentrated at the pit corner, and it is precisely the existence of the concentration that reduces the risk of engineering while brings more pressure to the supporting structure. In this paper, based on predecessors, selecting the Chenggong south station project of the first phase of Kunming Metro Line1as an example, through detailed comparisons between two-dimensional and three-dimensional analysis on the characteristics and applicability, demonstrating the importance of three-dimensional analysis for pit corner, Two-dimensional analysis is performed to be not entirely safer.