在深水赋存环境中，吸力锚是一种应用广泛的基础形式。不同于均质土，受成层土土质变化及分界面的影响，吸力锚在成层土中的力学沉贯特性极其复杂。因而，需开展成层土中吸力锚沉贯力学行为研究。采用欧拉-拉格朗日耦合方法，模拟吸力锚沉贯过程，利用模型试验对数值模拟进行验证，分析吸力锚在成层土中的力学沉贯特性。结果表明：受成层土力学特性影响，在沉贯过程中竖向应力逐渐增大，并在锚端部处形成竖向应力拱，且土体强度越强，竖向应力越集中；当吸力锚从淤泥质黏土贯入粉质黏土时，土体力学特性发生改变，侧摩阻力和端部阻力迅速增大。该研究运用试验与数值等方法深入探究了吸力锚在成层土中沉贯施工的力学行为，可为深水吸力锚成层土沉贯施工提供参考依据，具有重要的工程实践价值。

Suction anchors are widely used as a foundation type in deepwater environments. Unlike homogeneous soil, the mechanical penetration characteristics of suction anchors in layered soils are extremely complex, influenced by the variation in soil properties and interfaces between layers. Therefore, it is necessary to study the mechanical behavior of suction anchors during penetration in layered soils. An Euler-Lagrange coupling method was used to simulate the penetration process of suction anchors, and numerical simulations were validated through model tests. The mechanical penetration characteristics of suction anchors in layered soils were analyzed. The results show that, influenced by the mechanical properties of layered soils, vertical stress gradually increases during penetration, forming a vertical stress arch at the anchor tip. The stronger the soil strength, the more concentrated the vertical stress. Additionally, when a suction anchor penetrates from silty clay into silty clay, the mechanical properties of the soil change, causing the side friction and end resistance to increase rapidly. This study, which combines experimental and numerical methods, investigates the mechanical behavior of suction anchors during penetration in layered soils and provides valuable references for deep-water suction anchor penetration in layered soils, offering significant engineering practical value.