Field test and calculation method of negative skin friction of rock-socketed piles

WU Shuang-shuang; HU Xin-li; ZHANG Han; ZHOU Chang; GONG Hui

doi:10.16285/j.rsm.2017.2384

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Field test and calculation method of negative skin friction of rock-socketed piles

更新时间：2026-06-25

- Field test and calculation method of negative skin friction of rock-socketed piles
- Vol. 40, Issue 9, Pages: 3610-3617(2019)
- 作者机构：
  
  1. 中国地质大学（武汉）工程学院,湖北,武汉,430074
  2. 贵州桥梁建设集团有限责任公司,贵州,贵阳,550001
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.2384
  CLC： TU473
- Online First：08 September 2019，
  
  Published：2019
- 稿件说明：
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WU Shuang-shuang, HU Xin-li, ZHANG Han, et al. Field test and calculation method of negative skin friction of rock-socketed piles[J]. 2019, 40(9): 3610-3617.
DOI：

WU Shuang-shuang, HU Xin-li, ZHANG Han, et al. Field test and calculation method of negative skin friction of rock-socketed piles[J]. 2019, 40(9): 3610-3617. DOI： 10.16285/j.rsm.2017.2384.

摘要

桩?土剪切位移对桩基负摩阻力发展有重要的影响。在既有研究的基础上，通过桩周土体沉降与桩身应变的监测结果建立了计算桩?土剪切位移量的方法。利用该方法对浅中层桩?土监测数据进行分析，确定了在桩顶自由条件下该试验场地桩?土剪切位移量在4～5 mm；对于深层桩?土没有达到该剪切位移量，负摩阻力则无法发挥至极值。根据负摩阻力的发挥特征，改进了规范中嵌岩桩负摩阻力的计算方法，该方法同时考虑了桩周土竖向有效应力与桩土剪切位移的影响。使用该方法计算的负摩阻力与实测结果较为吻合，获得的下拉荷载能够达到安全与经济的效果，可供工程设计参考、借鉴。

Abstract

The pile-soil shear displacement has a significant influence on the development of negative skin friction of piles. Based on current research

a calculation method of plie-soil shear displacement was established by the monitoring results of the pile strain and the soil settlement in the field test. This method was used to analyze the monitoring data of pile and soil in the shallow middle layer

and then the shear displacement of pile and soil was determined to be 4?5 mm under the condition of free pile top in the test. However

the negative skin friction was unavailable to reach its extreme value when the shear displacement of deep pile and soil did not reach the above value. In addition

according to the development characteristics of negative skin friction

its calculation in the specifications was improved by considering both the vertical effective stress of soil around piles and the pile-soil shear displacement. The negative skin friction calculated by this improved method has a good correspondence with the test results. The obtained dragload can achieve a safe

economical effect

which can offer references for engineering design.

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