盘悬挑径对混凝土扩盘桩双桩抗拔承载性能的影响研究

引用文献:

于航 钱永梅 牛雷 李祖杰. 盘悬挑径对混凝土扩盘桩双桩抗拔承载性能的影响研究[J]. 建筑结构,2023,48(13):147-151.

YU Hang QIAN Yongmei NIU Lei LI Zujie. Research on influence of disc cantilever diameter on pull-out bearing capacity of concrete expanded-plate double piles[J]. Building Structure,2023,48(13):147-151.

作者:于航 钱永梅 牛雷 李祖杰
单位:吉林建筑大学土木工程学院
摘要:由于混凝土扩盘桩特殊的桩身构造,在上拔荷载作用下承力盘悬挑径成为影响双桩承载性能的重要因素。采用可视化小比例半截面桩试验方法对盘悬挑径与桩径比值分别为1.25、1.5、1.75、2的四组试验桩进行原状土试验,采用ANSYS软件对试验桩按扩大比1∶30进行有限元模拟分析。分析加载过程中桩周土体破坏情况,确定双桩在上拔荷载作用下的承载机理。对比分析上拔荷载作用下盘悬挑径对桩周土体破坏状态的影响,确定盘悬挑径对双桩抗拔承载性能的影响规律:在控制双桩桩间距相同的条件下,盘悬挑径越大双桩的抗拔承载性能越强,但双桩间的影响程度随之增大,抗拔承载力发生一定的折减。根据试验和模拟结果,确定双桩设计时盘悬挑径的合理取值。结果表明:在桩间距为7倍桩径时,盘悬挑径为桩径的1.5倍~1.75倍,混凝土扩盘桩双桩承载性能较好。
关键词:盘悬挑径;混凝土扩盘桩;双桩;抗拔承载性能;
作者简介:于航,硕士研究生,主要从事新型桩基础研究,Email:1756658282@qq.com。钱永梅,博士,教授,主要从事土木工程专业的科研和教学工作,Email:654675316@qq.com。
基金:国家自然科学基金项目(52078239)。
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参考文献[1] 王安福,张国梁.挤扩支盘桩承载特性及其应用发展[J].广东公路交通,2019,45(5):35-41.
[2] 赵跃平,钱德玲.支盘桩-土-结构相互作用体系的计算分析[J].建筑结构,2011,41(S1):1283-1288.
[3] 张振营,吴世明.挤扩支盘灌注桩的试验研究[J].建筑结构,2003,33(11):23-24.
[4] QIAN Y M,WANG J,WANG R Z.The analysis of the vertical uplift bearing capacity of single CEP pile[J].The Open Civil Engineering Journal,2015,9(1):598-601.
[5] 王伊丽,徐良英,李碧青,等.挤扩支盘桩竖向承载力特性和影响因素的数值研究[J].土木工程学报,2015,48(S2):158-162.
[6] 童宇,马宏伟,吴怡颖,等.挤扩支盘桩-土相互作用的机理研究[J].安徽理工大学学报(自然科学版),2020,40(2):13-18.
[7] 钱永梅,张冠群,田伟.混凝土扩盘桩的半面桩小模型试验方法研究[J].建筑结构,2018,48(S1):742-748.
[8] 马文杰,王旭,蒋代军,等.桩间距对群桩承载性能影响的室内模型试验研究[J].地下空间与工程学报,2018,14(S2):548-553.
[9] 田伟,夏天,钱永梅,等.盘截面形式对混凝土扩盘桩抗拔破坏状态的试验研究[J].建筑结构,2018,48(S2):850-855.
[10] 田伟,钱永梅,张冠群,等.黏性土土层含水率影响扩盘桩抗拔破坏的试验研究[J].工业建筑,2017,47(10):115-118.
[11] 钱永梅,梁松廷,翟莲,等.竖向拉力下盘径对混凝土扩盘桩破坏状态影响的原状土试验研究[J].工业建筑:2017(S2):377-381.
[12] 钱永梅,尹新生,钟春玲,等.挤扩多盘桩的土体极限承载力研究[J].哈尔滨工业大学学报,2005,37(4):568-570.
[13] 任佳佳,钱永梅,尹新生.浅析挤扩多盘桩单桩竖向抗拔承载力[J].建筑技术开发,2012,39(4):17-19.
[14] 田伟.桥梁基础中混凝土扩盘桩破坏模式及极限承载力研究[D].长春:吉林大学,2015.
Research on influence of disc cantilever diameter on pull-out bearing capacity of concrete expanded-plate double piles
YU Hang QIAN Yongmei NIU Lei LI Zujie
(College of Civil Engineering, Jilin Jianzhu University)
Abstract: Due to the special structure of concrete expanded-plate pile(CEP), the disc cantilever diameter becomes an important factor affecting the bearing capacity of double piles under uplift load. Four groups of test piles with the ratio of disc cantilever diameter to pile diameters of 1.25, 1.5, 1.75 and 2 were tested in unbroken soil by using the visualization small proportion half-section pile test method. The finite element analysis of test piles was carried out according to the enlargement ratio of 1∶30 by using ANSYS software. The failure of the soil around the piles during loading was analyzed to determine the bearing mechanism of the double piles under the uplift load. The influence of disc cantilever diameter under uplift load on the soil failure state around the pile was compared and analyzed, and the influence law of the disc cantilever diameter on the pull-out bearing capacity of double piles as determined. Under the condition of controlling the same distance between two piles, the larger the disc cantilever diameter, the stronger the pull-out bearing capacity of two piles, but the influence degree between two piles increases, and the pull-out bearing capacity decreases to a certain extent. According to the test and simulation results, the reasonable value of disc cantilever diameter in the design of double pile was determined. The results show that when the pile spacing is 7 times of pile diameter, the disc cantilever diameter is 1.5 to 1.75 times of pile diameter, and concrete expanded-plate double piles has better bearing capacity.
Keywords: disc cantilever diameter; concrete expanded-plate pile; double piles; pull-out bearing capacity
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