特大桥桥墩钢管桩围堰方案有限元对比分析

发布时间：2019-01-05 14:46

【摘要】：钢管桩围堰是一种施工简单的围堰形式,常用于深水基础建设过程中。结合湖南省某高速公路特大桥桥墩的钢管桩围堰设计论证,采用数值分析方法对三层及四层围檩—内支撑方案进行了有限元计算,对比分析了两种方案下钢管桩强度、刚度、稳定性。研究结果表明:采用三层围檩—内支撑方案进行支护的过程中,当排水到19 m时,最大水头差达到10 m,围堰内外水压力差达到100 k N/m,导致钢管桩承受很大的分布荷载,无论是采用分项系数法还是容许应力法,钢管桩的强度验算和刚度验算都不合格;而在四层围檩—内支撑条件下,钢管桩、围檩及撑杆均可满足强度、刚度、稳定性方面的要求。因此,为保障桥墩施工过程的安全性,建议采用四层围檩—内支撑方案进行支护。
[Abstract]:Steel pipe pile cofferdam is a simple construction cofferdam, which is often used in the process of deep water infrastructure construction. Combined with the design and demonstration of steel pipe pile cofferdam of the pier of a super large bridge in Hunan Province, the finite element method is used to calculate the three-story and four-story girth purlin support scheme, and the strength and stiffness of the steel pipe pile under the two schemes are compared and analyzed. Stability. The results show that the maximum water head difference is 10 m, and the water pressure difference is 100 K N / m when drainage to 19 m, which results in the steel pipe pile bearing a very large distributed load in the process of adopting the three-story purlin and inner bracing scheme, and the maximum water head difference is 10 m, and the water pressure difference inside and outside the cofferdam is 100 KN / m. The strength check and stiffness check of steel pipe pile are not qualified, whether by means of partial coefficient method or allowable stress method. Under the condition of four-story purlin and inner bracing, the steel pipe pile, purlin and brace can meet the requirements of strength, stiffness and stability. Therefore, in order to ensure the safety of pier construction, it is suggested to adopt the four-story purlin-inner support scheme.
【作者单位】：湖南省益南高速公路建设开发有限公司;
【分类号】：U445.556

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