竖向荷载作用下支盘桩水平动承载性能模型试验研究
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摘要
在对模型桩基施加水平振动荷载的同时,施加桩顶竖向荷载,对一根等直径桩和两根承力盘位置不同的支盘桩进行模型对比试验。结果表明:支盘桩与等直径桩相比,其承担水平动荷载的性能更加优越,且支盘桩的承力盘的位置接近桩顶时,这种优越性表现更明显;桩身动弯矩的大小随着水平振动荷载幅值的提高而增大;在水平动荷载数值较小时,竖向荷载的存在能够适当降低桩身弯矩值,对桩的水平动承载性能有利;当桩身水平动荷载数值增大,竖向荷载将会增大桩身弯矩而变为不利因素。
Applying both lateral vibration load and vertical load at the top of the model piles,a model test was done for a common straight pile and two squeezed branch and plate piles. The results of model test showed that the bearing behavior of the squeezed branch and plate pile was superior to the straight pile under complex loads. For the squeezed pile,when the plate was nearer to the pile top,the superiority was obvious. The moment value in the pile shaft increased with the lateral vibration load increasing. When the lateral vibration load was lower,the vertical load could reduce the pile shaft moment amplitude,and it was favorable to the pile. But when the lateral vibration load increased to a higher level,the vertical load would increase the pile shaft moment amplitude,and it was unfavorable to the pile.
Applying both lateral vibration load and vertical load at the top of the model piles,a model test was done for a common straight pile and two squeezed branch and plate piles. The results of model test showed that the bearing behavior of the squeezed branch and plate pile was superior to the straight pile under complex loads. For the squeezed pile,when the plate was nearer to the pile top,the superiority was obvious. The moment value in the pile shaft increased with the lateral vibration load increasing. When the lateral vibration load was lower,the vertical load could reduce the pile shaft moment amplitude,and it was favorable to the pile. But when the lateral vibration load increased to a higher level,the vertical load would increase the pile shaft moment amplitude,and it was unfavorable to the pile.
引文
[1]肖琦,王德弘,徐晶.输电线路挤扩支盘桩受力特性的试验研究[J].实验力学,2015,30(1):124-130.
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[4]欧阳永龙,张有,郑志红,等.支盘挤扩桩在桩基础中的应用及优势[J].中国煤炭地质,2012,24(12):37-40.
[5]卢锡雷,卢成原,卢鸿凯.支盘桩水平承载性状试验研究[J].建筑技术,2009,40(10):950-952.
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[7]GB/T 50123—1999土工试验方法标准[S].
[8]韩高孝,宫全美,周顺华.列车动荷载下桩网结构路基土拱效应试验研究[J].岩土力学,2014,35(6):1600-1606.
[9]刘春原,李光宏,李兵.预应力管桩振动台试验的数值分析[J].岩土力学,2012,33(增刊1):265-269.
[10]刘林超,闫启方,杨骁.SH简谐波作用下桩土横向动力相互作用解析分析[J].公路交通科技,2010,27(10):25-28.
[11]王钦刚,李云安,王伟,等.建筑基桩在振动荷载作用下的响应研究[J].科学技术与工程,2014,14(12):94-98.
[12]张崇磊,蒋关鲁,袁胜洋.循环荷载下桩网结构路基和垫层动力响应研究[J].岩土力学,2014,35(6):1664-1670.
[2]王燕,曾宇.挤扩支盘桩在公路桥梁中的应用[J].公路,2012(7):77-82.
[3]吕冰,高笑娟,钟国华.水平振动荷载作用下支盘桩模型试验研究[J].建筑科学,2014,30(9):45-50.
[4]欧阳永龙,张有,郑志红,等.支盘挤扩桩在桩基础中的应用及优势[J].中国煤炭地质,2012,24(12):37-40.
[5]卢锡雷,卢成原,卢鸿凯.支盘桩水平承载性状试验研究[J].建筑技术,2009,40(10):950-952.
[6]郑刚,王丽.竖向及水平荷载加载水平、顺序对单桩承载力的影响[J].岩土工程学报,2008,30(12):1796-1804.
[7]GB/T 50123—1999土工试验方法标准[S].
[8]韩高孝,宫全美,周顺华.列车动荷载下桩网结构路基土拱效应试验研究[J].岩土力学,2014,35(6):1600-1606.
[9]刘春原,李光宏,李兵.预应力管桩振动台试验的数值分析[J].岩土力学,2012,33(增刊1):265-269.
[10]刘林超,闫启方,杨骁.SH简谐波作用下桩土横向动力相互作用解析分析[J].公路交通科技,2010,27(10):25-28.
[11]王钦刚,李云安,王伟,等.建筑基桩在振动荷载作用下的响应研究[J].科学技术与工程,2014,14(12):94-98.
[12]张崇磊,蒋关鲁,袁胜洋.循环荷载下桩网结构路基和垫层动力响应研究[J].岩土力学,2014,35(6):1664-1670.