摘要
采用三维非线性有限元,对黏土地基中劲性复合桩的单桩水平承载性能进行研究,重点分析水平荷载-位移关系曲线、桩体材料受拉损伤因子分布、水平极限承载力、土体极限抗力等结果,揭示桩体尺寸、桩体和土体材料力学性能等因素的影响规律。研究结果表明:随着水平荷载的增加,素混凝土、水泥土先后受拉开裂,破坏区逐渐扩展,直至桩身出现塑性铰。劲性复合桩的水平极限承载力随桩体直径、桩体和土体材料强度的增加而增加,其中影响相对明显的是水泥土桩的直径。基于计算结果,给出桩侧土体极限抗力的分布形式建议和劲性复合桩的水平极限承载力简化计算方法。
A series of three-dimensional nonlinear finite element analyses were conducted to investigate the lateral bearing capacity of stiffened deep cement mixing(SDCM)piles in clay.The relationship between the lateral load and the displacement,the distribution of the tensile damage factor,the ultimate lateral capacity,and the lateral soil resistance were discussed in detail.Based on the numerical results,the effects of the pile dimension,the mechanical behaviors of the pile and the soil were analyzed.It is found that the ultimate lateral capacity of SDCM piles increased with the diameters of the cement pile and the concrete pile,the strengths of the pile materials and the soil.The diameter of the cement pile is more important to the lateral pile resistance.From the numerical simulations,the distribution of the limit soil resistance along the depth was suggested.Adopting the suggested distribution,the lateral capacity of a SDCM pile was given in terms of its geometry and limiting plastic moment.
作者
王建
朱志慧
王洪玉
朱庆华
费康
WANG Jian;ZHU Zhihui;WANG Hongyu;ZHU Qinghua;FEI Kang(Jiangsu Water Conservancy Construction Bureau,Nanjing 210029,China;College of Civil Science and Engineering,Yangzhou University,Yangzhou 225000,China;Jiangsu Surveying and Design Institute of Water Resources Co.Ltd,Yangzhou 225000,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第6期1382-1389,共8页
Journal of Railway Science and Engineering
基金
江苏省水利科技资助项目(2017017)。
关键词
劲性复合桩
破坏模式
水平荷载
黏土
有限元法
stiffened deep cement mixing pile
failure mode
lateral load
clay
finite element method
