土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (2): 273-277.

• 测试技术 • 上一篇    下一篇

某河谷漫滩地段桩基施工优化的试验研究

曲鹏冲1,2,张仁豪1,2,戴彦雄1,2,范寒光1,2,张 芳1,2   

  1. （1.机械工业勘察设计研究院有限公司，西安 710043；2.陕西省特殊岩土与处理重点实验室,西安 710043）
  • 收稿日期:2020-11-25 修回日期:2020-12-03 出版日期:2022-04-30 发布日期:2022-04-27
  • 作者简介:曲鹏冲（1993-），男，硕士，助理工程师，研究方向为岩土工程勘察。

Experimental Study on the Optimization of Pile Installation in a River Valley Floodplain

QU Pengchong1,2, ZHANG Renhao1,2, DAI Yanxiong1,2, FAN Hanguang1,2, ZHANG Fang1,2   

  1. (1.China JIKAN Research Institute of Engineering Investigations and Design Co. Ltd., Xi'an 710043;
    2.Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock, Xi'an 710043)
  • Received:2020-11-25 Revised:2020-12-03 Online:2022-04-30 Published:2022-04-27

摘要： 为合理推进工程进度，降低工程成本，增加经济效益，基于天水某勘察项目对建设工程场地桩基的持力层及施工工艺采用试桩法进行相应的选择优化。研究结果表明：在该建设场地范围内碎石土类地层较为密实，以卵石④层作为建筑桩基持力层其试桩效果明显优于强风化~中风化泥岩和砾岩互层⑤层，可作为桩端持力层；此外，采用旋挖钻孔泥浆护壁后注浆施工工艺试验桩的沉降稳定性优于未进行后注浆工艺的试验桩。

关键词: 天水, 河谷漫滩, 桩基, 优化

Abstract: In order to reasonably improve the projet schedule and to reduce the construction cost, the based on a survey project in Tianshui, the pile foundation was optimized by static pile loading tests so that the pile bearing layer and construction technique were able to be selected. The results show that the gravel soil stratum is relatively dense in the construction site so that the pebble layer ④ as the bearing layer for piles is appropriate; As the bearing layer, the pebble soil layer is obviously better than that of the interbedded layer ⑤ of the strongly weathered to moderately weathered mudstone and conglomerate, which can be also used as the pile end bearing layer. In addition, the settlement stability of the test pile under the external load is better than that of the test pile without post grouting.

Key words: tianshui, river valley floodplain, piled foundation, optimization

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