摘要
通过室内模型试验研究钙质砂中桩的承载性状,并采用石英砂进行对比。试验结果表明:在钙质砂和石英砂中桩的承载性状差异显著;开、闭口对桩的承载性能影响不大,相对密实度越大表现越明显;相同相对密实度下钙质砂中闭口桩的承载力较石英砂中低很多;钙质砂中桩侧荷载分担较小,大部分荷载由桩端土体承担,桩身下部与上部轴力相差不大,密实度越大,桩端轴力分担比例越高;石英砂中,桩身轴力沿桩身呈迅速减少,轴力衰减速率随深度增加而增大;与钙质砂相比,石英砂中桩侧摩阻力大很多;钙质砂和石英砂中桩侧摩阻力分布形式相似,近似呈抛物线型,表现出相同的性质;钙质砂中桩侧摩阻力未随相对密实度的增大而明显增加,而石英砂中桩侧摩阻力随相对密实度的增大而增加十分显著。
The bearing behaviors of pile in calcareous soil foundation were studied by model test. Silica sand was also tested for comparison. Results reveal that the bearing behaviors of single pile in calcareous sand are different with those in silica sand. The bearing capacity of end-open pipe pile hardly differs from that of end-closed pipe pile. But in the presence of the same relative compaction, the bearing capacity of end-closed pipe pile in calcareous sand is much lower than that in silica sand. Moreover, in calcareous sand, the soil at pile＇ s endpoint undertakes most of the loads, and the axial force on the upper part of the pile has no big difference with that on the lower part. The greater the soil compactness, the more the ratio of load sharing by pile＇ s axial force. In silica sand, the axial force of pile reduces rapidly along the depth direction, and the rate of decay grows with the increase of depth. The side friction of pile in silica sand is larger than that in calcareous soils. The side friction of pile in calcareous sand dis- tributes in a parabola shape, which is similar with that in silica sand. In calcareous sand, the side friction resist- ance of pile does not increase with the increase of relative compactness; whereas in silica sand, the increase is remarkable.
出处
《长江科学院院报》
CSCD
北大核心
2017年第1期87-90,共4页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51308209
51608192)
水能资源利用关键技术湖南省重点实验室开放基金项目(PKLHD201602)
湖南科技大学科研启动基金(E51497)
关键词
钙质砂
模型试验
承载力
桩侧摩阻力
颗粒破碎
calcareous sand
model test
bearing capacity
side frictional resistance
grain crushing
作者简介
杨超（1983-），男，湖北武汉人，博士，讲师，主要从事岩土力学与工程方面的教学和研究工作，（电话）0731-58290269（电子信箱）yangc_3201@foxmail．com。
