摘要
为分析单叶片螺旋钢桩在砂土地层竖向抗压承载特征,结合单叶片螺旋钢桩现场静载试验进行有限元软件模拟。将数值计算结果与现场实测数据进行对比分析,验证其数值计算结果的可靠性,其次采用该有限元软件分别模拟不同相对密实度砂土中几何参数不同的单叶片螺旋钢桩静载试验而得到不同荷载-位移曲线,同时将螺旋叶片直径的5%位移值对应荷载作为桩极限承载力。考虑砂土相对密实度,钢桩埋深,螺旋叶片直径,中心钢轴4个参数变化对单叶片螺旋钢桩极限承载力影响。结果表明:单叶片螺旋钢桩桩周土层的相对密实度和桩埋深是影响承载力的主要参数,螺旋钢桩叶片直径影响次之,钢轴直径的影响最小;同时,单叶片螺旋钢桩极限承载力增量百分比在松砂中最大,中密砂次之,密砂最小。
In order to analyze the compressive bearing behavior of single-helix piles in sandy soil, static load test of single-helix piles is carried out by finite element software simulation. The numerical calculation results are compared with the field measured data to verify the reliability of numerical calculation. The finite element software is used again to simulate the static load test of different single-helix piles in different compactness sands, and different load-displacement curves are obtained respectively. The load corresponding to 5% displacement of the blade diameter is used as ultimate bearing capacity of the pile. Four parameter variations affecting the ultimate bearing capacity of single-helix piles are the relative compactness of sand, the depth of the pile, the diameter of the blade, and the diameter of the shaft. The results show that the relative compactness and pile depth of the single-helix piles are the main parameters affecting the bearing capacity, the diameter of the blade diameter comes the second, and the shaft diameter generates the least. At the same time, the percentage increase of the ultimate bearing capacity of the pile is the largest in loose sand, followed by the medium sand and the dense sand the last.
作者
王希云
邵康
苏谦
刘凯文
邹婷
WANG Xi-yun;SHAO Kang;SU Qian;LIU Kai-wen;ZOU Ting(Shenhua Baoshen Railway Group Co.,Ltd. , Baotou 014000, China;Key Laboratory of High Speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 60031, China;Dadu River Hydropower Development Co.,Ltd. , Chengdu 610041, China)
出处
《铁道标准设计》
北大核心
2019年第7期66-71,共6页
Railway Standard Design
基金
国家自然科学基金(51608461)
神华包神铁路集团公司科技创新项目(CSIEZB170204598)
中央高校基本科研业务费专项资金(A0920502051619-17)
关键词
螺旋钢桩
静载试验
数值分析
荷载-位移曲线
极限承载力
Helical pile
Static load test
Numerical analysis
Load-displacement curve
Ultimate bearing capacity
