Bearing characteristics of cement-fly ash mixing pile composite foundation

doi:10.3785/j.issn.1008-973X.2022.09.005

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (9): 1724-1731 DOI: 10.3785/j.issn.1008-973X.2022.09.005

Bearing characteristics of cement-fly ash mixing pile composite foundation

Sheng-quan ZHOU1(

),Hao-jin ZHANG1,Rui WANG1,Yong-fei ZHANG2,Dong-wei LI3

1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
2. Hefei Branch of JZFZ Architectural Design Company Limited , Hefei 230000, China
3. School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China

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Abstract

A model test of cement-fly ash mixing pile (CFMP) composite foundation was carried out. By analyzing the signal of strain gauge and earth pressure sensor, the stress transfer characteristics of pile body and fly ash foundation during loading were explored. Results showed that the load settlement curve of CFMP composite foundation was slow reduction type, and the bearing capacity of CFMP composite foundation was 2.2 times of that of fly ash foundation. Pile side resistance distribution along the depth of the pile was unimodal, and the peak value was at the middle of the pile. When the pile top load was accumulated to 1 600 N, pile side resistance reached the limit value, and pile side resistance appeared softening with the increase of the load. When the pile top load reached 800 N, the effect of pile tip bearing layer was prominent, and the pile tip resistance ratio entered a period of rapid rise. And the mechanical properties that mainly to bear the pile side resistance were presented by CFMP.

Key words： model test cement-fly ash mixing pile (CFMP) load transfer load-carrying property pile side resistance

Received: 15 September 2021 Published: 28 September 2022

CLC:

TU 473

Fund: 国家自然科学基金资助项目（42061011，41977236）；江西省自然科学基金资助项目（20192ACBL20002）；安徽省建筑科学研究设计院资助课题（2022-JKYL-006）；安徽理工大学2021研究生创新基金资助项目（2021CX2038）

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	Dong-wei LI

Cite this article:

Sheng-quan ZHOU,Hao-jin ZHANG,Rui WANG,Yong-fei ZHANG,Dong-wei LI. Bearing characteristics of cement-fly ash mixing pile composite foundation. Journal of ZheJiang University (Engineering Science), 2022, 56(9): 1724-1731.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.09.005 OR https://www.zjujournals.com/eng/Y2022/V56/I9/1724

水泥−粉煤灰搅拌桩复合地基承载特性

开展水泥?粉煤灰搅拌桩（CFMP）复合地基模型试验，分析应变片及土压力传感器的信号，探究加载过程中桩身及粉煤灰地基中的应力传递特性. 结果表明：CFMP复合地基荷载沉降曲线为缓降型，CFMP复合地基的承载能力是粉煤灰地基的2.2倍；桩侧摩阻力沿桩身深度呈单峰分布，阻力峰值位于桩身中端；当桩顶荷载累加至1 600 N时，桩侧摩阻力到达极限值，并随荷载增加出现侧摩阻力软化现象；当桩顶荷载达到800 N时，桩端持力层的作用凸显，桩端阻力比进入迅速上升期，CFMP呈现以承担桩侧摩阻力为主的受力性状.

关键词： 模型试验, 水泥?粉煤灰搅拌桩(CFMP), 荷载传递, 承载性能, 桩侧摩阻力

Fig.1 Cement-fly ash mixing pile composite foundation field static load test diagram

Fig.2 Field static load-displacement curve of cement-fly ash mixing pile composite foundation

Fig.3 Model test layout of cement-fly ash mixing pile composite foundation

Fig.4 Fly ash particle grading curve

Fig.5 Strength curve of cement fly ash test block

Fig.6 Diagram of pile strain gauge sticking

Fig.7 Earth pressure sensor layout

Fig.8 Model test vertical load-displacement curve

Fig.9 Under various load pile axial force curve

Tab.1 Reduction of pile axial force along pile body under various loads

Fig.10 Lateral friction resistance curves of piles under various loads

Fig.11 Lateral friction of different piles and relative displacement curve of pile-soil

Fig.12 Pile-soil stress ratio curve of cement-fly ash mixing pile composite foundation under vertical load

Fig.13 Pile tip resistance curves of cement-fly ash mixing pile composite foundation under different loads

Fig.14 Pile tip resistance ratio curves of cement-fly ash mixing pile composite foundation under different loads


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