土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (1): 58-62.

• 专题论述 • 上一篇    下一篇

某地区管桩常见桩端持力层的CASE阻尼系数取值研究

袁畅，王维泽，殷华军，刘永明   

  1. （广东柏正工程检测有限公司，广东惠州 516000）
  • 收稿日期:2023-04-11 修回日期:2023-05-06 出版日期:2025-02-28 发布日期:2025-03-01
  • 作者简介:袁畅（1992-），男，硕士研究生，工程师，注册岩土工程师，研究方向为岩土工程检测、监测。

CASE Damping Coefficient for the Bearing Stratum at Pipe Pile Tip in a Project Area

YUAN Chang, WANG Weize, YIN Huajun， LIU Yongming   

  1. (Guangdong Baizheng Engineering Testing Co. Ltd., Huizhou 516000)
  • Received:2023-04-11 Revised:2023-05-06 Online:2025-02-28 Published:2025-03-01

摘要： 由于岩土层性质的地区差异，以及桩型、桩径、施工工艺的影响，目前各大研究机构、仪器生产商的CASE阻尼系数经验取值对地区缺乏精准指导意义。以某地区管桩常见持力层（强风化泥质粉砂岩）为研究对象，通过同一场地3根不同直径的管桩进行动静对比试验，推算出该地区管桩常见桩端持力层的CASE阻尼系数，并分析桩径对阻尼系数取值的影响。分析得到：强风化泥质粉砂岩作为该地区管桩桩端持力层时，CASE阻尼系数参考取值为0.35~0.55。此地区同一场地的强风化泥质粉砂岩Jc值极差超过平均值的30%，数据离散型过大，因此Jc取值时还应考虑管桩桩径和桩身净截面积等因素，具体表现为桩径越大而Jc取值越小的负相关关系。

关键词: 高应变, 阻尼系数, 承载力, 动静对比

Abstract: Due to the regional differences in the properties in geomaterials, as well as the influence of pile type, dimension and installation methods, the empirical values for the CASE damping coefficient recommended by major research institutes and instrument manufacturers are lack of precision for geomaterials in some regions.  A typical bearing stratum for the pipe pile (strongly weathered argillaceous siltstone) in a project area was selected to conduct the dynamic and static axial load tests of three pipe piles with different diameters. The CASE damping coefficient of the bearing stratum at the pipe pile tip is back-analyzed, and the influence of the pile diameter on the damping coefficient is analyzed. The results show that the CASE damping coefficient is 0.35~0.55 when the strongly weathered argillaceous siltstone is used as the bearing layer of the pile tip in this area. But the Jc value range of strongly weathered argillaceous siltstone in the same site is more than 30% of the average value, and the data are too discrete, it is shown that the larger the pile diameter is, the smaller the Jc value is.

Key words: High Strain, Damping Coefficient, Axial Capacity, Dynamic and Static Load Testing

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