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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (9): 1724-1731    DOI: 10.3785/j.issn.1008-973X.2022.09.005
土木工程、交通工程     
水泥−粉煤灰搅拌桩复合地基承载特性
周盛全1(),章昊琎1,王瑞1,张勇飞2,李栋伟3
1. 安徽理工大学 土木建筑学院，安徽 淮南 232001
2. 成都基准方中建筑设计有限公司合肥分公司，安徽 合肥 230000
3. 东华理工大学 土木与建筑工程学院，江西 南昌 330013
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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摘要：

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    
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
收稿日期: 2021-09-15 出版日期: 2022-09-28
CLC:  TU 473  
基金资助: 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）
作者简介: 周盛全（1975—），男，教授，博士，从事特殊土地基研究. orcid.org/0000-0001-7229-2258. E-mail： lqpzsq@163.com
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引用本文:

周盛全,章昊琎,王瑞,张勇飞,李栋伟. 水泥−粉煤灰搅拌桩复合地基承载特性[J]. 浙江大学学报(工学版), 2022, 56(9): 1724-1731.

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.

链接本文:

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

图 1  水泥−粉煤灰搅拌桩复合地基现场静载试验图
图 2  水泥−粉煤灰搅拌桩复合地基现场静荷载−位移曲线
图 3  水泥−粉煤灰搅拌桩复合地基模型试验布置图
图 4  粉煤灰颗粒级配曲线
图 5  水泥粉煤灰试块强度曲线
图 6  桩身应变片粘贴示意图
图 7  土压力传感器布置图
图 8  模型试验竖向荷载−位移曲线
图 9  各级荷载作用下桩身轴力曲线
L/cm Ts/N
Fb=200 N Fb=400 N Fb=600 N Fb=800 N Fb=1 000 N Fb=1 200 N Fb=1 400 N Fb=1 600 N Fb=1 800 N Fb=2 000 N
[2.5, 11.5) 64 127 176 192 150 168 182 155 254 271
[11.5, 20.5) 67 135 180 196 290 270 320 337 308 334
[20.5, 29.5) 30 21 87 190 210 220 220 237 292 301
[29.5, 38.5) 16 24 23 80 70 180 180 185 220 246
[38.5, 47.5) 14 41 48 38 110 150 170 182 189 220
表 1  各级荷载作用下桩身轴力沿桩身减幅
图 10  各级荷载作用下侧摩阻力沿桩身变化曲线
图 11  不同桩身处桩侧摩阻力−桩土相对位移曲线
图 12  竖向荷载下水泥−粉煤灰搅拌桩复合地基桩土应力比曲线
图 13  各级荷载作用下水泥−粉煤灰搅拌桩复合地基桩端阻力曲线
图 14  各级荷载作用下水泥−粉煤灰搅拌桩复合地基桩端阻力比曲线
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