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王   丽¹ , 陈宏杰²

 

( 1. 河北省地矿局第二地质大队 , 唐山   063000 ;  2.  国检测试控股集团雄安有限公司 ,  雄安   070001)

摘  要 :  为研究浸水条件下软土地基的承载特性与稳定性 , 依托典型软土地基工程实例 , 通过静载荷试验、旁压试验 、静力触探等方法 , 研究软土地基在不同深度 、不同位置的沉降特性、变形模量、锥阻力、侧摩阻力、摩阻比 , 分析其发展变化规律。结果表明 : 浸水条件下软土地基承载力和稳定性均呈显著分层特征 ; 软土深度小于 2 m 时 , 静载试验最大沉降量达 60. 0 mm , 变形模量为 5. 4 ~ 6. 1 MPa , 静力触探锥尖阻力多为 0. 2 ~ 0. 6 MPa , 反映出浅层土体承载力较低的力学特征 , 存在明显稳定性风险 ; 深度大于 5 m 后 , 沉降量降低至 32. 5 mm ,  变形模量上升至 7. 2 ~ 8. 3 MPa , 静力触探锥尖阻力稳定在 0. 8 MPa 左右 , 摩阻比下降至 5. 3% ~ 5. 8% , 表明中深层土体密实 、承载能力增强 , 地基结构趋于稳定 。浅层软土受水影响大 、承载力低 、沉降大 , 是地基稳定性的主要控制层 ;  中深层土体密实度提高 , 承载能力和稳定性明显增强 , 可作为主要承载层加以利用 。研究结果可为类似工程提供参考。

关键词 : 浸水条件 ; 软土地基 ; 承载力分析 ; 稳定性评价 ; 原位测试

中图分类号 : TU447           文献标志码 : A           文章编号 :  1005- 8249  (2026)  03-0103-06

DOI :10. 19860/j. cnki. issn1005- 8249. 2026. 03. 017

 

WANG Li¹ , CHEN Hongjie²

( 1. The Second Geological Brigade of Hebei Geology and Mining Bureau  ,  Tangshan 063000 ,  China;

2. National Inspection and Testing Holding Group Xiong ’an Co. , Ltd. ,  Xiong ’an 070001 , China)

Abstract :  To study the bearing characteristics and stability of soft  soil foundations under waterlogged conditions , this paper is based on typical soft soil foundation engineering case studies.   Through  static  load tests , lateral pressure tests , and static cone penetration tests , the settlement characteristics , deformation modulus , cone resistance , side friction resistance , and friction ratio of soft soil foundations at different depths and locations are analyzed , and their developmental patterns are examined.   The results indicate that under waterlogged conditions , the bearing capacity and stability of soft soil foundations exhibit obvious stratification characteristics.   When the soft soil depth is less than 2 m , the maximum settlement from the  static load test reaches 60. 0 mm , the deformation modulus is 5. 4-6. 1 MPa , and the static cone penetration tip resistance is mostly 0. 2-0. 6 MPa , reflecting the low bearing capacity of shallow soil layers and posing significant stability risks.   When  the  depth  exceeds  5 m , the settlement decreases to 32. 5 mm , the deformation modulus rises to 7. 2- 8. 3  MPa ,  the  static cone penetration tip resistance  stabilizes at  around 0. 8 MPa , and the friction ratio drops to 5. 3%-5. 8% , indicating that  mid-to-deep soil layers are denser , the bearing capacity is enhanced , and the foundation structure tends to be  stable.   Shallow  soft  soil  is  heavily  affected  by  water ,  has  low bearing capacity , and large settlement , making it the main controlling layer for foundation stability.   In  contrast ,  the  density , bearing capacity , and stability of mid-to-deep soil layers are significantly improved and can be utilized as the primary bearing layers.   The findings of this study may serve as a reference for similar projects.

Key words :  immersion conditions ; soft layer; bearing capacity analysis ; stability evaluation; in-situ test