摘要
采用数值分析方法验证HS模型的优越性及参数选取办法的可行性,分析小型预制单桩和群桩在不同布桩参数及荷载作用下抗拔承载特性,结果表明:采用HS模型的数值模拟结果与现场实测结果相差不大,仅考虑剪切硬化的MC模型数值计算结果误差偏大;小型预制桩抗拔承载性能均随着桩长及桩径的增加而增大,增速幅度成递减趋势,工程中应充分考虑桩长、桩径与承载性能的非正比例关系,合理选取得到最优桩长和桩径;群桩基础下单桩平均抗拔承载性能要小于单桩抗拔承载性能;桩距相同,桩数越大,群桩效应越明显;桩数相同,桩距增大,群桩效应将得到减弱;小型预制桩群桩基础存在一个最优桩距,可取5倍桩径;水平荷载较大时对桩基极限抗拔承载性能有较大影响。研究结论对小型预制桩基础的优化设计计算提供指导。
The numerical analysis method is used to verify the superiority of HS model and the feasibility of parameter selection method. The buckling bearing characteristics of small precast single pile and group pile under different pile parameters and loads are analyzed. The results show that the value of HS model The results of simulation are not much different from those of on-site measurements. The results show that the error of numerical calculation of MC model considering only shear hardening is large. The anti-pull-out bearing capacity of small precast piles increases with the increase of pile length and pile diameter,Decreasing trend,the project should give full consideration to the non-proportional relationship between pile length,pile diameter and bearing capacity,and select the optimal pile length and pile diameter reasonably. The average lifting capacity of single pile under group pile foundation is less than that of single pile The pile group effect is weakened; the optimal pre-pile group pile foundation has an optimal pile spacing,which can be 5 times the pile Diameter; when the horizontal load is larger,the ultimate pull-out capacity of pile foundation has a greater impact. The conclusions of the study provide guidance on the optimal design and calculation of small precast pile foundation.
作者
李国强
LI Guoqiang(Zaozhuang Highway Administration Tengzhou Highway Bureau,Zaozhuang,Shandong277500,Chin)
出处
《公路工程》
北大核心
2018年第3期236-240,共5页
Highway Engineering
关键词
HS模型
小型预制桩
抗拔承载特性
HS model
small precast pile
anti-pull bearing property
