预应力混凝土管桩对路基沉降变形的影响  

The influence of prestressed concrete pipe piles on roadbed settlement deformation

作　　者：陈爽 曾鹏 袁盛超 丁海滨 伍冰妮 CHEN Shuang;ZENG Peng;YUAN Shengchao;DING Haibin;WU Bingni(Nuclear Industry East China Construction Engineering Group,Nanchang 330013,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]核工业华东建设工程集团,江西南昌330013 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《甘肃科学学报》2024年第6期13-18,共6页Journal of Gansu Sciences

摘　　要：路基沉降变形是控制改扩建道路工程质量的重要因素,为减少路基的沉降变形值,可设置预应力混凝土(PC)管桩减少桩基持力和土体变形。以唐津高速公路(丰南界-塘承)改移工程为算例,基于PLAXIS 3D模拟了不同地层条件下有无PC管桩时路基变形发育的全过程,同时分析了不同桩长、桩径和桩间距等影响因素下路基沉降变形的发展规律。算例结果发现,布置PC管桩时路基的最大沉降与水平位移分别减少了41.6%和62.8%。路基沉降变形值与桩长、桩径呈非线性反比关系,与桩间距呈V形变化关系并在桩间距为2 m处达到最小沉降。设置PC管桩对路基的沉降变形有抑制作用,因此,合理地选取PC管桩的桩长、桩径、桩间距优化路基设计成为抑制路基沉降变形的关键,同时在确保工程质量的情况下实现最优性价比。The settlement deformation of roadbed is an important factor to control the quality of road reconstruction and expansion.In order to reduce the settlement deformation value of roadbed,prestressed concrete(PC) pipe pile can be set to reduce the pile foundation holding force and soil deformation.Taking the Tang-Jin Expressway(Fengnan Jie-Tangcheng) relocation project as an example,the whole process of subgrade deformation development with or without PC pipe pile under different formation conditions is simulated based on PLAXIS 3D,and the development law of subgrade settlement deformation under different influencing factors such as pile length,pile diameter and pile spacing is analyzed.The results show that the maximum settlement and horizontal displacement of the subgrade are reduced by 41.6% and 62.8% respectively.The settlement deformation of the subgrade has a nonlinear inverse relationship with pile length and pile diameter,a V-shaped relationship with pile spacing,and the minimum settlement is reached when the pile spacing is 2 m.Setting PC pipe piles can inhibit the settlement deformation of roadbed.Therefore,selecting the pile length,pile diameter and pile spacing of PC pipe piles reasonably to optimize the roadbed design becomes the key to restrain the settlement deformation of roadbed,and to achieve the optimal cost performance while ensuring the project quality.

关 键 词：预应力混凝土管桩 路基 沉降变形 数值模型 

分 类 号：TU45[建筑科学—岩土工程]