格型板桩圆筒内部土体破坏面的稳定性分析  

Stability analysis of rupture surface of soil inside sheet pile cellular

作　　者：谢锦波 XIE Jin-bo(CCCC Third Harbor Engineering Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中交第三航务工程局有限公司,上海200032

出　　处：《水运工程》2022年第6期190-194,共5页Port & Waterway Engineering

摘　　要：挡土结构稳定性验算时土体破坏面的选择关系到计算精度与工程经济性,严重时还会影响工程安全。针对格型板桩圆筒失稳时地基土破坏面可能位于圆筒内部的情况,分析其破坏模式与计算方法。结合工程实例,建立数值模型分析失稳时圆筒底部土体破坏面的位置;针对相邻圆筒底高程不一致的情况提出了Hansen法“双破坏面”的计算假定并给出具体算例,并提出2种改善圆筒内部土体破坏面稳定性的思路。结果表明,增加圆筒入土深度并对被动区与圆筒内部的土体进行加固,可有效提高格型板桩圆筒沿内部破坏面的稳定性。The selection of soil rupture surface is related to the calculation accuracy and engineering economy in the stability analysis of retaining structure,sometimes it also affects the engineering safety.Considering that the rupture surface of foundation soil may be located inside the sheet pile cellular when it overturns,we analyze its failure mode and calculation method,build a numerical model to analyze the location of soil rupture surface at the bottom of the sheet pile cellular based on an engineering example,propose the calculation assumption of“double rupture surfaces”of Hansen method in view of the inconsistency of the bottom elevation of adjacent cellular,give a specific calculation example,and propose two methods to improve the stability of soil failure surface inside the cellular.The results show that increasing the penetration depth of sheet piles and strengthening the soil in the passive area and inside the cellular can effectively improve the stability of sheet pile cellular along the internal failure surface.

关 键 词：格型板桩圆筒 稳定性分析 破坏面 Hansen法 

分 类 号：U656.3[交通运输工程—港口、海岸及近海工程]