Abstract: As a kind of the filling material for the cofferdam, the strength of cement Stabilized Dredged Fill (SDF) has spatial variability. The insite data of SDF strength of Tekong Island reclamation project was collected to analyze the probability characteristics of the strength and conduct the simulations of random fields that fitted the strength distribution of SDF. The numerical models of cofferdam were respectively established under the condition of random field and uniform field, and the stability analysis was conducted by Monte Carlo method. The results show that the high spatial variability of SDF has a significant effect on the stability of SDF cofferdam, which makes the design of practical engineering conservative.

Key words: geotechnical engineering, sea mud, cement, cofferdam, spatial variability, stability

摘要： “水泥固化流塑态填料”（SDF）作为一种垦地围堰的填筑材料，其强度具有空间变异性。利用Tekong岛填海工程中SDF强度采样数据，分析SDF强度概率分布特征，模拟SDF强度分布随机场。均匀场和随机场条件下，利用Monte Carlo模拟法对实际垦地围堰工程进行模拟和稳定性分析。研究表明：SDF强度存在很强的空间变异性，对SDF围堰稳定性影响显著，因此导致实际工程的设计方案偏于保守。

关键词: 岩土工程, 海泥, 水泥, 围堰, 空间变异性, 稳定性