搅拌桩加固挤土效应及在地铁隧道保护中的应用  

Soil squeezing effect of DCM pile and its application to subway tunnel

作　　者：付艳斌[1,2] 廖少明[2] 朱合华[2] 

机构地区：[1]深圳大学土木工程学院,深圳518060 [2]同济大学地下建筑与工程系/岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土力学》2009年第7期2005-2010,共6页Rock and Soil Mechanics

基　　金：国家863计划资助项目(No2006AA11Z102);深圳市科技计划项目(NoSY200806270077A)

摘　　要：在减小地基变形进行的深层搅拌桩加固时,加固本身的挤土效应对隧道变形产生了影响。为此,模拟了搅拌桩(DCM)侧向挤土效应的4种荷载模式,结合实测资料并采用数值试验验证了侧向挤土荷载模式的合理性。进一步应用该模式,通过有限元模拟了搅拌桩的加固挤土效应,分析讨论了不同加固顺序对地面变形,隧道变形以及长期蠕变变形的影响,结论表明,搅拌桩加固对地面环境影响是不可忽略,隧道周围搅拌桩施工顺序对隧道变形影响较大,搅拌桩加固后长期蠕变效应相对加固过程的变形很小。Soil squeezing effect induced by DCM （deep cement mixing） pile has an impact on tunnel deformation while the cement mixing pile is used to strengthen the ground around tunnel. Four lateral load models are proposed and verified based on numerical simulation and measured data. Soil squeezing effect is simulated by the finite element method using the lateral load model. The ground deformation ,tunnel deformation concerning creep effect are analyzed with respect to different construction sequences. The results show that construction sequences have a great effect on ground deformation and the deformation of the tunnel when DCM pile is constructed, but tunnel deformation concerning creep effect is small.

关 键 词：深层搅拌桩 侧向荷载模式 挤土效应 地铁隧道 

分 类 号：TU473[建筑科学—结构工程]