由多道地连墙平行间隔布置而成的条壁式地连墙基础已应用于国外桥梁锚碇工程,但目前这种新型基础的承载性能研究还不充分。本文聚焦竖向承载特性分别开展高、低承台条壁式地连墙基础数值研究,分析了地连墙的墙高、墙间净距、墙厚、墙体数量及承台埋深等因素影响下的竖向承载性能变化规律,结果表明:与高承台相比,承台效应使低承台地连墙基础承载力提升约30%,随着承台埋深持续增加,端阻力贡献会显著降低、侧阻力贡献得到提升,但总承载力变化不明显;增加墙高能提升竖向承载力,但在墙高效应的影响下,竖向承载力的增加幅度随墙高增加明显变缓;随着墙间净距减小,在相邻墙体“夹持”下墙间土体与墙壁相对位移减小、侧摩阻力发挥受到抑制并导致竖向承载力降低;随着墙体厚度增加,端阻力占比几乎不受影响,承载力的提升主要源自侧壁摩阻力的增加;墙体数量的变化对侧壁摩阻力发挥影响较小。研究成果对条壁式地连墙基础的设计及应用具有参考价值。
The strip wall foundation, which is arranged in parallel intervals of multi-passage ground wall, has been applied to bridge anchoring projects in foreign countries. However, the research on load-bearing performance of this new foundation is not enough. This paper focuses on the vertical bearing characteristics, numerical research on the foundation of high and low cap wall is carried out, and the changes of vertical bearing performance of the wall are analyzed under the influence of factors such as wall height, clear distance between walls, wall thickness, wall number and buried depth of cap. The results show that: Compared with the high cap, the bearing capacity of the diagram wall foundation of the low cap increases by about 30%. With the continuous increase of the buried depth of the cap, the contribution of the end resistance decreases significantly and the contribution of the side resistance increases, but the total bearing capacity does not change significantly. However, under the influence of high efficiency stress, the increase of vertical bearing capacity decreases with the increase of wall height. With the decrease of the net distance between the walls, the relative displacement between the soil and the walls decreases under the "clamping" of the adjacent walls, the lateral friction resistance is inhibited, and the vertical bearing capacity decreases. With the increase of wall thickness, the proportion of end resistance is almost unaffected, and the increase of bearing capacity is mainly due to the increase of side friction resistance. The change of the number of walls has little influence on the friction resistance of side walls. The research results of this paper have a good reference value for the design and application of strip wall foundation.
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