土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (4): 571-575.

• 专题论述 • 上一篇    下一篇

全风化花岗岩混凝土桩界面剪切特性研究

王雪涛1，2，唐 瑞1，苏 栋1，3，4   

  1. （1. 深圳大学土木与交通工程学院，广东深圳 518060；2.深圳市机场（集团）有限公司建设工程指挥部，广东深圳 518128；
    3.滨海城市韧性基础设施教育部重点实验室（深圳大学），广东深圳 518060；
    4.深圳市地铁地下车站绿色高效智能建造重点实验室，广东深圳 518060）
  • 收稿日期:2023-06-11 修回日期:2023-07-03 出版日期:2025-08-31 发布日期:2025-08-27
  • 作者简介:王雪涛（1977-），女，研究员，研究方向为岩土工程。
  • 基金资助:
    深圳市高等院校稳定支持计划(20220808143139001)；国家自然科学基金(51938008)

Study on Interface Shear Behavior between Completely Decomposed Granite and Concrete

WANG Xuetao1,2, TANG Rui1, SU Dong1,3,4   

  1. (1.College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060;
    2.Construction Project Office of Shenzhen Airport Group Co., Ltd., Shenzhen 518128;
    3.Key Laboratory for Resilient Infrastructures of Coastal Cities, Shenzhen University, Shenzhen 518060;
    4.Shenzhen Key Laboratory of Green, Efficient and Intelligent Construction of Underground Metro Station, Shenzhen University, Shenzhen 518060)
  • Received:2023-06-11 Revised:2023-07-03 Online:2025-08-31 Published:2025-08-27

摘要： 全风化花岗岩分布广泛，桩基工程中常采用泥浆护壁防止桩孔土体坍塌，但泥皮强度较低，会导致桩基承载力下降，为提高全风化花岗岩地层中的桩基承载性能，部分工程采取后注浆对桩基周围土体进行加固。采用直剪试验研究了泥皮、不同水泥含量桩周加固土以及混凝土表面粗糙度对桩土界面剪切特性的影响。结果表明：泥皮的润滑作用使得桩土界面强度大幅降低；对全风化花岗岩注浆加固可有效提高桩土界面抗剪强度，但界面破坏呈现脆性特性；随着桩表面粗糙度的提升，接触面的内摩擦角和黏聚力均有所提升。


关键词: 全风化花岗岩, 直剪试验, 泥皮, 加固土, 桩侧粗糙度

Abstract: The completely decomposed granite is widely distributed. In deep foundation engineering, slurry is often used to prevent bore-hole caving in soil. However, the strength of mud cake is low, which will lead to the reduction of pile axial capacity. To improve the axial resistance of the pile in the completely granite stratum, post grouting is used to reinforce the soil around the piles. The direct shear tests were used to study the influence of mud cake effect, soil around piles with different cement content and the roughness of the shaft on the shearing behavior of the pile-soil interface. The results show that the interface strength between pile and soil is greatly reduced due to the lubrication of the mud cake. Grouting reinforcement can effectively improve the shear strength of pile-soil interface, but the behavior becomes brittle. Both the internal friction angle and the cohesion of the interface increase with an increase of the roughness of shaft.

Key words: Completely Decomposed Granite, Direct Shear Test, Mud Cake, Cemented Soil, Shaft Roughness

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