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结合某水上基坑围护结构的方案设计,采用二维有限元数值模拟研究了地下连续墙与混凝土填充组合钢板桩两种不同基坑围护方案的变形与受力特性。基于Plaxis 2D分别建立两种方案考虑结构与土体共同作用的整体计算模型,对比并分析不同施工工况下围护墙侧向变形、稳定安全系数及支护结构内力的差异。研究表明,由于钢板桩围护方案克服了常规地下连续墙工法须先筑堤再成槽的陆上施工方法的不足,能够与前方码头结构同步进行水上施工,同时组合钢板桩更能有效地结合两排钢板桩与混凝土芯墙的整体刚度,减小作用于围护墙的土压力。施工工艺、施工工序及围护墙整体刚度的差异,使得组合钢板桩方案在基坑变形与稳定控制等方面均明显优于地下连续墙方案。
Combined with the scheme design of the retaining structure of a water foundation pit, the deformation and stress characteristics of two kinds of foundation pit protection schemes of underground continuous wall and concrete filled steel sheet pile were studied by two-dimensional finite element numerical simulation. Based on Plaxis 2D, two schemes were respectively established to consider the overall calculation model of interaction between structure and soil, and the differences of lateral deformation, stability safety factor and internal force of support structure under different construction conditions were compared and analyzed. The research shows that because the steel sheet pile protection scheme overcomes the shortcomings of the on-land construction method that the conventional underground continuous wall construction method needs to be ditched and then ditched first, the water construction can be carried out simultaneously with the structure of the front wharf structure, and the steel sheet pile is combined with the steel sheet pile more effectively The overall stiffness of two rows of steel sheet piles and concrete core walls reduces the earth pressure acting on the retaining wall. The difference of construction technology, construction process and the overall stiffness of the retaining wall make the combination of steel sheet piles program significantly better than the underground diaphragm wall in the deformation and stability control of foundation pit.