摘要
在托板桩复合地基承载力分析中,托板桩桩身中性点位置是计算桩侧负摩阻力和下拉荷载的关键。采用有限元分析了托板尺寸、桩间距、填土厚度和桩端土层刚度等对中性点位置的影响,研究表明,托板桩桩身中性点深度不同于常规桩,中性点位置受托板尺寸和桩端土的刚度的影响显著,而受填土高度和桩间距的影响相对较小。通过对一具体工程进行数值模拟,计算结果(中性点的深度为0.33L)与实测值(中性点的深度为0.36L)相符合。
During the analysis of capacity of composite foundation with capped pile, the depth of neutral point is a key to value negative skin friction and down-drag load on capped piles. The size of pile cap, spacing of piles, thickness of filled soil, modulus of underlying soil layers were discussed by FEM. The results show that the depth of neutral point on capped piles is different from that of normal pile. The depth of neutral point is obviously affected by the size of pile cap and the stiffness of underlying soil layers and less influenced by the spacing of piles and thickness of filled soil. A case was studied in this text. The numerical result is consistent with the measured one.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第3期577-581,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金资助项目(50308026)
关键词
托板桩
复合地基
中性点
capped piles
composite foundation
neutral point
