注浆施工过程对既有桩基变形影响的有限元模拟研究  

FINITE ELEMENT SIMULATION STUDY ON THE INFLUENCE OF GROUTING CONSTRUCTION PROCESS ON THE DEFORMATION OF EXISTING PILE FOUNDATION

作　　者：徐立强 高斌勇 刘源 XU Liqiang;GAO Binyong;LIU Yuan(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,Beijing 100082,China;College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]北京市市政工程设计研究总院有限公司,北京100082 [2]湖南大学土木工程学院,长沙410082

出　　处：《低温建筑技术》2021年第5期117-120,共4页Low Temperature Architecture Technology

摘　　要：隧道下穿建筑物时,注浆加固过程可能会对建筑物桩基产生不利影响。文中依托深圳某盾构隧道下穿建筑物注浆加固项目,通过PLAXIS 3D有限元软件模拟了袖阀管注浆过程对桩基产生的影响。结果表明桩的水平位移随注浆压力增大而增大,但桩的竖向位移随注浆压力增大而减小;注浆过程对土体扰动后,建筑物周边棱角处出现最大沉降,其值为2.5mm,桩的最大沉降为2.32mm。The grouting reinforcement process may adversely affect the pile foundation of the building when the tunnel goes under the building.Based on the grouting reinforcement project of a shield tunnel underneath a building in Shenzhen,the impact of the sleeve valve tube grouting process on the pile foundation is simulated through PLAXIS 3 D finite element software.The results show that the horizontal displacement of the pile increases with the increasing grouting pressure,but the vertical displacement of the pile decreases.the maximum settlement occurs at the edges and corners of the building after the disturbance to the soil caused by grouting process.Its value is 2.5 mm,and the maximum settlement of the pile is 2.32 mm.

关 键 词：注浆加固 建筑物桩基 有限元软件 注浆压力 

分 类 号：TU433[建筑科学—岩土工程]