弃渣土特征参数对沉管桩性状的影响  

Effect of Characteristic Parameters of Tunnel Slag on the Behavior of Immersed Tube Pile

作　　者：刘丽萍[1] 陈新 王建政 王胜利 LIU Liping;CHEN Xin;WANG Jianzheng;WANG Shengli(School of Civil&Architecture Engineering,Xi’an Technological University,Xi’an 710021,China;Shaanxi Electric Power Design Institute,Xi’an 710054,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021 [2]陕西省电力设计院,西安710054

出　　处：《西安工业大学学报》2020年第3期253-259,共7页Journal of Xi’an Technological University

基　　金：西安工业大学研究生教育教学改革研究项目(XAGDYJ190219);西安工业大学2019年国家级大创项目(201910702039)。

摘　　要：为提升弃渣土桩基施工质量,依托实体工程,利用模拟软件建立位于弃渣土场地下的沉管桩三维模型,研究了弃渣土厚度、内摩擦角和扩大头尺寸对桩基的桩顶沉降、桩身轴力和桩侧摩阻力等性状的影响。结果表明:弃渣土内摩擦角对桩工作性状的影响甚小,可以忽略,而弃渣土厚度影响明显,厚度增加,负摩阻区域增大,桩顶沉降量增加;扩大头尺寸增大,桩体的极限承载力增大,桩顶沉降值减小,超过一定范围则产生不利影响,推荐扩大头合理尺寸范围为0.55~0.75m。In order to improve the construction quality of pile foundation in tunnel slag,based on specific engineering,this paper establishes the three dimensional model of immersed tube pile under tunnel slag condition.The effects of the thickness of tunnel slag,internal friction angle and enlarged head size on the settlement of pile top,axial force of pile body and frictional resistance of pile side are studied.The calculation results show that the influence of internal friction angle of tunnel slag is negligible,and the influence of tunnel slag thickness is obvious,with the increase of thickness,the area of negative friction increases,and the settlement of pile top increases.With the increase of enlarged head size increases,the ultimate bearing capacity of pile increases,and the settlement of pile top decreases,but it has adverse effects beyond a certain range.The reasonable size range is recommended to be 0.55~0.75 m.

关 键 词：弃渣土 特征参数 沉管桩 性状 

分 类 号：TU473.1[建筑科学—结构工程]