土工基础

›› 2019, Vol. 33 ›› Issue (3): 379-383.

• 工程实录 • 上一篇    下一篇

钻孔灌注桩沉渣厚度检测技术发展和展望

刘 客1，侯龙清1，李明东1,2,3，戴仁辉1   

  1. （1.东华理工大学土木与建筑工程学院，南昌 330013；2.东华理工大学核资源与环境国家重点实验室，南昌 330013；
    3.河海大学土木与交通学院，南京 2210098）
  • 收稿日期:2018-08-26 修回日期:2018-09-30 出版日期:2019-06-20 发布日期:2019-08-16
  • 作者简介:刘 客（1996-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:

    国家自然科学基金（51609093）；中国博士后科学基金(2017M611675)

State of the Practice Review of the Estimating of the Thickness of Loose Sediment at the Bottom of Drilled Piles

LIU Ke1, HOU Longqing1, LI Mingdong1,2,3,  DAI Renhui1   

  1. （1.School of Civil and Architectural Engineering， East China University of Technology, Nanchang 330013；
    2.State Key Laboratory of Nuclear Resource and Environment，East China University of Technology, Nanchang 330013；
    3.College of Civil and Transportation Engineering，Hohai University，Nanjing 210098）
  • Received:2018-08-26 Revised:2018-09-30 Online:2019-06-20 Published:2019-08-16

摘要： 灌注桩施工过程中产生的桩底沉渣会降低桩侧摩阻力和桩底端阻力，是影响钻孔灌注桩桩基质量的重要因素之一，基于钻孔灌注桩沉渣问题对桩基承载力的危害性，对沉渣厚度精准检测属于灌注桩施工中的重要环节。按照不同施工工序总结了灌注桩浇筑前孔底沉渣检测技术和成桩后桩底沉渣检测技术，阐述各类沉渣检测技术的工作原理以及使用效果，分析并概括了不同沉渣检测技术的特点和适用性，对钻孔灌注桩沉渣检测技术的发展进行总结和展望。

关键词: 桩基础, 灌注桩, 沉渣, 检测, 声波法, 低应变法

Abstract: The loose sediment at the bottom of bored piles will reduce the side friction and the resistance at the bottom of the pile. It is one of the important factors affecting the quality of the bored pile foundation. Due to the adverse effect of the bottom loose sediment to the bearing resistance of bored piles, the accurate measurement of the thickness of the bottom loose sediments is an important aspect in the bored pile construction. The soft sediment measurement methods before and after the concrete pouring for different construction procedures are summarized in this paper. The principles and results of these measurement methods are also introduced. Different methods for the specific construction methods are also recommended in this paper.

Key words: Piled Foundations, Cast in Place Bored Concrete Piles, Loose Sediment, Testing, Acoustic Wave Method, Low Strain Method