一阶变截面桩与等截面桩对比试验研究
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摘要
为研究一阶变截面桩在竖向荷载下的变形和承载特性,选取一组一阶变截面桩与等截面桩进行对比静载试验。试验分析对比了桩身轴力分布曲线、桩端应力及变截面处应力变化曲线、桩侧摩阻力沿桩身分布曲线和桩顶P-S曲线。结果表明:一阶变截面桩单位体积材料发挥效率更高,较等截面桩发挥效率提高约8%;变截面桩荷载传递仍然以侧摩阻力为主,当变截面处土层较弱时,随着荷载的增大变径处土层发生软化,变径处阻力趋于稳定,发挥作用有限。
In order to study the deformation and bearing characteristics of first-order variable diameter pile under vertical load,a set of first-order variable diameter piles and equal diameter piles were selected for comparative static load test.This test made an analysis by comparing the axial force distribution curve of the pile body,the stress at the pile end and the stress variation curve at the variable section,the pile side frictional resistance along the pile body distribution curve and the pile top P-S curve.The results showed that the first-order variable-section piles had higher efficiency per unit volume of material,8% higher than that of equal diameter piles.The load transfer of the variable-section piles was still dominated by the lateral friction.When the soil layer was weak at the variable section,it softened at the variable diameter as the load increased,and the resistance at the variable diameter tended to be stable,with limited function.
In order to study the deformation and bearing characteristics of first-order variable diameter pile under vertical load,a set of first-order variable diameter piles and equal diameter piles were selected for comparative static load test.This test made an analysis by comparing the axial force distribution curve of the pile body,the stress at the pile end and the stress variation curve at the variable section,the pile side frictional resistance along the pile body distribution curve and the pile top P-S curve.The results showed that the first-order variable-section piles had higher efficiency per unit volume of material,8% higher than that of equal diameter piles.The load transfer of the variable-section piles was still dominated by the lateral friction.When the soil layer was weak at the variable section,it softened at the variable diameter as the load increased,and the resistance at the variable diameter tended to be stable,with limited function.
引文
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[10]刘杰,何杰,闵长青.楔形桩与圆柱形桩复合地基承载性状对比研究[J].岩土力学,2010(7):2202-2206.
[11]刘春阳,张淑华,陈光明,等.基于ANSYS的双排钢板桩海堤受力特性分析[J].华东交通大学学报,2016,33(2):106-113.
[12]杨果林,陈似华,林宇亮.大直径扩径桩与等截面桩对比试验研究[J].铁道科学与工程学报,2009,6(2):34-37.
[2]杨庆光,田捷,刘杰.阶梯型变截面管桩沉桩阻力计算方法与模型试验研究[J].工业建筑,2015,45(11):104-110.
[3]杨有莲,朱俊高.钻孔变截面灌注桩的荷载传递特性[J].水利水电科技进展,2008(3):37-39.
[4]梁韵,任士房,耿大新,等.大直径变截面桩竖向承载力及沉降算法研究[J].华东交通大学学报,2009,26(4):34-38.
[5]方焘.阶梯型变截面桩变形及承载特性研究[D].重庆:重庆大学,2012.
[6]方焘,刘新荣,耿大新,等.大直径变径桩竖向承载特性模型试验研究(Ⅰ)[J].岩土力学,2012(10):2947-2952.
[7]JUSTO E,VAZQUEZ B M,JUSTO J L,et al.An elastoplastic model for the analysis of a driven pile extended with a micropile[J].Computers and Geotechnics,2017,87:10-19.
[8]MINDLIN R D.Force at a point in the interior of a semi-infinite solid[J].Physics,1936,7(5):195-202.
[9]刘杰,何杰,闵长青.楔形刚性桩与桩周土的非线性相互作用[J].铁道学报,2010,32(2):137-140.
[10]刘杰,何杰,闵长青.楔形桩与圆柱形桩复合地基承载性状对比研究[J].岩土力学,2010(7):2202-2206.
[11]刘春阳,张淑华,陈光明,等.基于ANSYS的双排钢板桩海堤受力特性分析[J].华东交通大学学报,2016,33(2):106-113.
[12]杨果林,陈似华,林宇亮.大直径扩径桩与等截面桩对比试验研究[J].铁道科学与工程学报,2009,6(2):34-37.