基于原型试验的黄土地区钢管——混凝土组合桩单桩横向抗力特性分析
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摘要
为研究水平荷载作用下黄土地区钢管—混凝土组合桩的横向抗力特性,结合山西芮城某光伏发电厂桩基工程现场试验结果,分析了在水平推力作用下钢管—混凝土组合桩桩顶位移梯度、地基土水平抗力比例系数等的变化规律。研究结果表明:随着水平推力增大,不同埋深桩桩顶位移梯度均呈不断增大变化趋势,水平推力每增加3 k N,桩顶位移平均增大8. 07×10-2mm·k N-1;随着水平推力增大,桩侧地基土水平抗力比例系数呈不断减小变化趋势,水平推力每增加3 k N,地基土水平抗力比例系数平均减小79. 22 MN/m4;随着桩顶水平位移量增大,桩周地基土水平抗力比例系数均呈不断减小变化趋势,且水平位移量平均每增加0. 95 mm,地基土水平抗力比例系数平均增大29. 84 MN/m4。
In order to analyze the lateral resistance characteristics of concretefilled steel tubes pipe in loess area under horizontal load,on the basis of a support project in Ruicheng city Shanxi province,this paper has researched on the change law of displacement gradient of concretefilled steel tubes pile,the horizontal resistance coefficient of the soil around pile under horizontal load The results show thatas the horizontal thrust increases,the topdisplacement gradient of piles with different buried depth shows a growing tendency while the ratio coefficient of foundation soil horizontal resist forcedecreases continuously. When the horizontal thrust is increased by 3 k N,the displacementincreases by 8.07 × 10-2 mm·k N-1 and the coefficient decreases by 79. 22 MN/m4. The horizontal resistance coefficient shows a decreasing trend with the increase of the horizontal displacement on the piles top,and theaverage value of horizontal resistance coefficient increased by 29.84 MN/m4 with the average increase of horizontal displacement 0. 95 mm.
In order to analyze the lateral resistance characteristics of concretefilled steel tubes pipe in loess area under horizontal load,on the basis of a support project in Ruicheng city Shanxi province,this paper has researched on the change law of displacement gradient of concretefilled steel tubes pile,the horizontal resistance coefficient of the soil around pile under horizontal load The results show thatas the horizontal thrust increases,the topdisplacement gradient of piles with different buried depth shows a growing tendency while the ratio coefficient of foundation soil horizontal resist forcedecreases continuously. When the horizontal thrust is increased by 3 k N,the displacementincreases by 8.07 × 10-2 mm·k N-1 and the coefficient decreases by 79. 22 MN/m4. The horizontal resistance coefficient shows a decreasing trend with the increase of the horizontal displacement on the piles top,and theaverage value of horizontal resistance coefficient increased by 29.84 MN/m4 with the average increase of horizontal displacement 0. 95 mm.
引文
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[15]李彰明,全国权,刘丹,等.土质边坡建筑桩基水平荷载试验研究[J].岩石力学与工程学报,2004,23(6):930-935.
[16]孙建超,叶朝良,刘尧军,等.京石客专声屏障桩基础水平静载试验及数值分析[J].建筑技术报,2017,48(3):249-252.
[17]张进林,沈军辉.单桩水平静载试验及成果参数取值问题初探[J].水文地质工程地质,2005(4):100-103.
[2]包松考,郑敬云.单桩水平静载试验分析[J].南阳理工学院学报,2012,4(2):46-57.
[3]吕凡任,邵红才,金耀华.对称双斜桩基础水平承载力模型试验研究[J].长江科学院院报,2013,30(2):67-70.
[4]彭芳乐,大内正敏,日下部治.岩体斜面上刚性桩基础水平承载力的三维分析与评价[J].岩石力学与工程学报,2003,22(6):1008-1008.
[5]辛纬韬,张子新,吴昌将.船撞作用下苏通大桥群桩基础水平承载力分析[J].地下空间与工程学报,2009,5(s2):1746-1750.
[6]董译之,吕艳平,陈福全.超大直径单桩基础高频振动贯入过程中的土塞效应[J].广西大学学报(自然科学版),2018,43(1):287-296.
[7] KOJIMA E,KUMAGAI H,TOMISAWA K,et al. Estimate of the static horizontal load versus horizontal displacement on steel pipe piles by dynamic horizontal load tests[J]. Jiban Kogaku Janaru,2010,5(4):555-568.
[8] ZHANG C,YU J,HUANG M. Winkler load-transfer analysis for laterally loaded piles[J]. Canadian Geotechnical Journal,2016,53(7):1-15.
[9] NIAZI F S,MAYNE P W. Cone Penetration Test Based Direct Methods for Evaluating Static Axial Capacity of Single Piles[J]. Geotechnical and Geological Engineering,2013,31(4):979-1009.
[10]王帆,蓝小艺,潘晓荣,等.内置环肋正交X形节点承载力计算方法(英文)[J]. Journal of Southeast University(English Edition),2016,32(1):67-72.
[11]孔纲强,周航,曹兆虎.扩底楔形桩水平向承载力理论计算方法研究[J].现代隧道技术,2016,53(1):119-126.
[12]徐枫.基于原型试验的单桩水平承载力分析[J].岩土工程学报,2011,33(增刊2):291-294.
[13]孔纲强,周立朵,杨庆,等.基于p-y曲线法的扩底楔形桩水平向承载力理论分析[J].中国公路学报,2016,29(6):179-206.
[14]叶万灵,时蓓玲.桩的水平承载力实用非线性计算方法-NL法[J].岩土力学,2000,21(2):97-101.
[15]李彰明,全国权,刘丹,等.土质边坡建筑桩基水平荷载试验研究[J].岩石力学与工程学报,2004,23(6):930-935.
[16]孙建超,叶朝良,刘尧军,等.京石客专声屏障桩基础水平静载试验及数值分析[J].建筑技术报,2017,48(3):249-252.
[17]张进林,沈军辉.单桩水平静载试验及成果参数取值问题初探[J].水文地质工程地质,2005(4):100-103.