单叶片螺旋钢桩竖向承载特性数值分析
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摘要
为分析单叶片螺旋钢桩在砂土地层竖向抗压承载特征,结合单叶片螺旋钢桩现场静载试验进行有限元软件模拟。将数值计算结果与现场实测数据进行对比分析,验证其数值计算结果的可靠性,其次采用该有限元软件分别模拟不同相对密实度砂土中几何参数不同的单叶片螺旋钢桩静载试验而得到不同荷载-位移曲线,同时将螺旋叶片直径的5%位移值对应荷载作为桩极限承载力。考虑砂土相对密实度,钢桩埋深,螺旋叶片直径,中心钢轴4个参数变化对单叶片螺旋钢桩极限承载力影响。结果表明:单叶片螺旋钢桩桩周土层的相对密实度和桩埋深是影响承载力的主要参数,螺旋钢桩叶片直径影响次之,钢轴直径的影响最小;同时,单叶片螺旋钢桩极限承载力增量百分比在松砂中最大,中密砂次之,密砂最小。
In order to analyze the compressive bearing behavior of single-helix piles in sandy soil, static load test of single-helix piles is carried out by finite element software simulation. The numerical calculation results are compared with the field measured data to verify the reliability of numerical calculation. The finite element software is used again to simulate the static load test of different single-helix piles in different compactness sands, and different load-displacement curves are obtained respectively. The load corresponding to 5% displacement of the blade diameter is used as ultimate bearing capacity of the pile. Four parameter variations affecting the ultimate bearing capacity of single-helix piles are the relative compactness of sand, the depth of the pile, the diameter of the blade, and the diameter of the shaft. The results show that the relative compactness and pile depth of the single-helix piles are the main parameters affecting the bearing capacity, the diameter of the blade diameter comes the second, and the shaft diameter generates the least. At the same time, the percentage increase of the ultimate bearing capacity of the pile is the largest in loose sand, followed by the medium sand and the dense sand the last.
In order to analyze the compressive bearing behavior of single-helix piles in sandy soil, static load test of single-helix piles is carried out by finite element software simulation. The numerical calculation results are compared with the field measured data to verify the reliability of numerical calculation. The finite element software is used again to simulate the static load test of different single-helix piles in different compactness sands, and different load-displacement curves are obtained respectively. The load corresponding to 5% displacement of the blade diameter is used as ultimate bearing capacity of the pile. Four parameter variations affecting the ultimate bearing capacity of single-helix piles are the relative compactness of sand, the depth of the pile, the diameter of the blade, and the diameter of the shaft. The results show that the relative compactness and pile depth of the single-helix piles are the main parameters affecting the bearing capacity, the diameter of the blade diameter comes the second, and the shaft diameter generates the least. At the same time, the percentage increase of the ultimate bearing capacity of the pile is the largest in loose sand, followed by the medium sand and the dense sand the last.
引文
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[2] 王腾飞,刘建坤,邰博文,等.螺旋桩冻拔特性的模型试验研究[J].岩土工程学报,2018,40(6):1084-1092.
[3] 王腾飞,刘建坤,邰博文,等.单向冻结条件下模拟螺旋桩的冻拔响应[J].长安大学学报(自然科学版),2017,37(4):25-33.
[4] Wang T,Liu J,Zhao H,et al.Experimental study on the anti-jacking-up performance of a screw pile for photovoltaic stents in a seasonal frozen region[J].Journal of Zhejiang University-SCIENCE A,2016,17(7):512-524.
[5] 王腾飞,刘建坤,刘晓强,等.季节冻土区光伏支架螺旋桩基的冻胀数值分析研究[J].冰川冻土,2016,38(4):1167-1174.
[6] Wang T,Liu J,Tian Y,et al.Frost jacking characteristics of screw piles by model testing[J].Cold Regions Science and Technology,2017,138:98-107.
[7] 孟凯.季节冻土区光伏支架螺旋桩基受力性能研究[D].哈尔滨:哈尔滨工业大学,2016.
[8] 田彦德.螺旋钢桩冻胀融沉特性试验研究[D].北京:北京交通大学,2017.
[9] 乔红军,彭丽云,杨成才,等.叶片式螺旋桩静载试验及数值模拟[J].北京建筑大学学报,2017,33(4):12-17.
[10] 马艺琳,王毅娟,魏新良.竖向承压螺旋桩承载力影响因素对比分析[J].北京建筑大学学报,2017,33(4):22-26.
[11] 王健,邱成,曹伟,等.基于承压试验的黏土地基螺旋桩承载力计算方法探讨[J].特种结构,2017,34(5):65-70.
[12] 王健,赵凯,白新平,等.黏性土中螺旋桩安装扭矩和承载力关系的探究[J].特种结构,2017,34(6):29-34.
[13] 王达麟.螺旋钢桩竖向承载机理试验研究[D].天津:天津大学,2012.
[14] 董天文,李士伟,张亚军,等.软土地基螺旋桩竖向抗拔极限承载力计算方法[J].岩石力学与工程学报,2009(S1):3057-3062.
[15] 董天文,梁力,王炜,等.抗拔螺旋桩叶片与地基相互作用试验研究[J].工程力学,2008,25(8):150-155.
[16] 胡伟,刘顺凯,张亚惠,等.单叶片全尺寸螺旋锚桩竖向拉拔试验研究[J].土木建筑与环境工程,2017,39(5):31-39.
[17] Elsherbiny Z H,El Naggar M H.Axial compressive capacity of helical piles from field tests and numerical study[J].Canadian Geotechnical Journal,2013,50(12):1191-1203.
[18] Gavin K,Doherty P,Tolooiyan A.Field investigation of the axial resistance of helical piles in dense sand[J].Canadian Geotechnical Journal,2014,51(11):1343-1354.
[19] Al-Baghdadi T.Screw piles as offshore foundations:Numerical and physical modelling[D].Dundee:University of Dundee,2018.
[20] Mitsch M P,Clemence S P.The uplift capacity of helix anchors in sand[C]//Uplift Behavior of Anchor Foundations in Soil.ASCE,1985.
[21] Malik A A,Kuwano J,Tachibana S,et al.End bearing capacity comparison of screw pile with straight pipe pile under similar ground conditions[J].Acta Geotechnica,2017,12(2):415-428.