沿海桩基黏性土地层压缩层厚度的确定——土层结构性的考虑
Determination of the Compression Layer Thickness of Pile Foundations in Coastal Clayey Soils—How to Consider Soil Structures
摘要: 桩基压缩层厚度的确定对桩基沉降计算结果有重要的影响，现行规范中通常采用应力比法确定压缩层厚度，其中应力比α的取值单一且缺乏理论指导。以沿海某桩基工程深厚黏性土土层的桩基沉降计算为例，表明采用规范规定的两个不同的应力比α取值(0.1或0.2)计算得到的压缩层厚度以及沉降差异较大，无法考虑现场黏土结构性对压缩层厚度的影响。提出了一种根据土的结构性确定压缩层厚度的方法：以视超固结比OCR来表征黏性土地层结构性大小，该参数可通过静力触探试验CPT获得，采用OCR确定黏性土地层应力比α的取值。这种方法能考虑不同地质成因的黏性土结构性对压缩层厚度的影响，可用于沿海深厚黏性土地区的桩基沉降计算。
Abstract: The determination of the compression layer thickness of pile foundations has a significant impact on the calculation results of pile settlement. Current design codes typically adopt the stress ratio method to determine the compression thickness, where the selection of the stress ratio α is singular and lacks theoretical guidance. Taking the settlement calculation of a pile foundation in deep clayey soil layers in a coastal site as an example, this study demonstrates that using two different stress ratio α values of 0.1 or 0.2 specified in the codes leads to considerable discrepancies in the compression layer thickness and settlement, failing to account for the influence of in-situ clay structures. A new method for determining the compression thickness based on clayey soil structures is proposed: the over consolidation ratio (OCR) is used to characterize the structural strength of clayey soil stratum, which can be obtained through cone penetration tests (CPT). The OCR is then employed to determine the stress ratio α for clayey soil stratum. This approach can effectively consider the influence of structural characteristics of clayey soils with different geological origins on the compression layer thickness, making it applicable for pile settlement calculations in coastal areas with deep clayey soil stratum.
文章引用：高彦斌, 杨云戈. 沿海桩基黏性土地层压缩层厚度的确定——土层结构性的考虑[J]. 土木工程, 2025, 14(9): 2291-2302. https://doi.org/10.12677/hjce.2025.149246

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