摘要
面对深厚软土层工况,探究采用群桩基础加强地基承载力的最佳桩间距,采用数值模拟的方法对大直径桩基承载特性进行研究,并通过计算沉降理论值验证数值模拟结果的合理性。结果表明:①群桩地基中,边桩沉降普遍大于角桩,扩大桩间距可减小沉降值,也使各桩沉降更加一致,推荐最佳桩间距为5~6倍桩径,即5D~6D;②群桩中侧摩阻力分布存在角桩大、边桩小的情况,增大桩间距可使各桩之间侧摩阻力发挥更充分,但过大的桩间距会使侧摩阻力减小;③对桩间距为5 D时的沉降值经理论值进行验算,得到总沉降理论计算值为16.53 mm,与数值模拟结果24.56 mm接近,且满足规范最大沉降值要求。
Facing the situation of soft and weak soil,we explored the optimal pile spacing of using group pile foundation to strengthen the bearing capacity of the foundation.The bearing characteristics of large-diameter pile foundations was studied by numerical simulation method,and the rationality of the numerical simulation results were verified by calculating settlement theoretical values.The results showed that:①In group pile foundation,the settlement of edge piles was generally greater than that of corner piles.Expanding the pile spacing could reduce the settlement value and make the settlement of each pile more consistent.The recommended optimal pile spacing range was 5 to 6 times the pile diameter,which was 5D to 6D.②The distribution of lateral friction resistance in pile groups was characterized by larger angle piles and smaller edge piles.Increased pile spacing allows for fuller lateral frictional resistance between each pile,but excessive spacing between piles could reduce the lateral friction resistance.③When the spacing between piles was 5D,the theoretical settlement value was verified and the total settlement theoretical calculation value was 16.53 mm,which was close to the numerical simulation result of 24.56 mm and met the maximum settlement value requirements of the specification.
作者
汪志翔
巴蛟龙
吴永强
王其祥
戎葛
WANG Zhixiang;BA Jiaolong;WU Yongqiang;WANG Qixiang;RONG Ge(China Railway Seventh Group(Huizhou)Engineering Construction Co.,Ltd.,Huizhou 516000,China)
出处
《水利水电快报》
2024年第8期72-77,共6页
Express Water Resources & Hydropower Information
关键词
大直径群桩
软土地基
侧摩阻力
沉降
数值模拟
large diameter pile groups
soft soil foundation
side friction resistance
settlement
numerical simulation
