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传统的重力式锚碇设计方法不考虑围护结构对基础承载力的贡献,随着施工技术与质量的进步,发挥地连墙围护结构承载力贡献的新型复合基础成为新的研究方向。以虎门二桥工程锚碇基础为背景采用有限元软件模拟了锚碇基础的建造过程,分析了缆力施加前后地下连续墙-锚碇的受力与位移变化,验证了地下连续墙-锚碇复合基础协同承载假定。研究表明:地下连续墙的抗剪强度、地下连续墙与周围土体的摩阻力对锚碇基础水平向抗滑移承载力均有贡献;采用地下连续墙作为基坑围护结构的大跨悬索桥锚碇基坑设计可考虑地下连续墙-锚碇基础的协同承载特性。
The traditional gravity anchorage design method does not consider the contribution of enclosure structure to the foundation bearing capacity. With the improvement of construction technology and quality, the new composite foundation that contributes to the bearing capacity of the wall retaining structure has become a new research direction. Based on the anchorage foundation of Humen No.2 bridge project, the finite element software was used to simulate the construction process of anchorage foundation. The force and displacement of diaphragm wall-anchorage were analyzed before and after the cable force was applied. Composite Foundation Cooperative Assumption. The results show that the shear strength of diaphragm wall and the frictional resistance between diaphragm wall and surrounding soil contribute to the horizontal anti-slip bearing capacity of anchored diaphragm foundation. The long-span suspension bridge with underground diaphragm wall as retaining structure The design of the anchorage foundation pit can take into account the synergistic bearing characteristics of the diaphragm wall-anchor foundation.