深淤泥基础海堤断面结构与滑动稳定关系初探

Preliminary Study on the Relation Between Cross Section Structure and Sliding Stability of Seawall with Deep Silt Foundation

对采用排插板法进行基础处理的深淤泥海堤断面总宽度进行了深入研究,通过对浙江沿海地区淤泥土物理力学参数统计回归分析,得出了淤泥天然抗剪强度与天然含水量之间的经验关系。基于北京理正软件进行大量滑动稳定计算,分析了海堤宽度B与海堤高H、淤泥层天然抗剪强度指标、淤泥层厚度之间的关系,并得出了海堤断面总宽B的计算公式,并通过工程实际进行检验计算,得出本文公式与实际工程基本吻合。此外,对海堤滑动安全系数随淤泥抗剪强度指标变化关系进行了敏感分析,认为内摩擦角对海堤抗滑安全系数的影响比凝聚力的影响更敏感。

The width of cross section of seawall with deep silt foundation treated by drainage and solidification was investigated in depth.By statistical regression analysis on the physical-mechanical parameters of silt in coastal areas of Zhejiang province,the empirical relationship between the natural shear strength and natural water content of silt was obtained.On the basis of sliding stability calculation,the relations among the width B and height H of the seawall,the natural shear strength index of silt-seam,and the thickness of silt-seam were analyzed.The formula of seawall＇s total width B total was also gained.Verification showed that the result of the formula was consistent with the actual project.In addition,sensitive analysis was carried out to research the variation of sliding safety coefficient against the change of silt shear strength.It was found that the impact of internal friction angle on anti-sliding coefficient was larger than that of cohesive force.