高临空抗滑桩桩间土回填施工稳定性分析  

Stability analysis of high free surface anti-slide pile during construction period

作　　者：魏建贵[1,2] 黄双华[2] 汪杰[1,2] 

机构地区：[1]西华大学土木与建筑工程学院,四川成都610039 [2]攀枝花学院建筑与土木工程学院,四川攀枝花617000

出　　处：《四川建筑科学研究》2014年第5期174-177,共4页Sichuan Building Science

摘　　要：以攀枝花机场12#滑坡治理工程为例,探讨在高临空抗滑桩桩间回填土施工过程中,碾压回填土与抗滑桩的作用机制。将作用于抗滑桩的载荷分为土体自重和挤密压实载荷两部分,考虑回填土碾压机械荷载的复杂性,通过在有限元模型中设置回填土表面的碾压沉陷量作为边界条件,从而避开了设置碾压荷载的复杂性,实现了对碾压回填土施工的模拟,获取了填土高差与桩水平位移的关系曲线。通过对有限元分析结果与现场监测数据进行对比分析得出如下结论:采用二维模型并不能反映群桩效应使得数值分析结果偏大;机械密压实载荷是抗滑桩在施工期间出现较大水平位移的重要因素;回填碾压施工过程中,抗滑桩并不会出现整体性滑移。最后,提出了减小抗滑桩水平位移的施工建议。This paper takes No. 12 landslide control in Panzhi-hua airport as an example, to discuss fill and anti-slide pile interact mechanism during high free surface anti-slide pile construction period. The loads effect on anti-slide pile are classed into two parts ： soil weight and compaction load. Considering the complicated of load during compaction, this paper set sinkage of backfill surface as boundary condition in fem model. Avoided complex of setting the compaction load,obtained the relative curve of compacted height and horizontal displacement of pile. Drawing these conclusions when compared the result of finite element analysis with scene monitoring： Using Two-dimensional model can not reflect the pile group effect. The numerical results larger than monitoring; Compacted load of machine is a key factor result in large horizontal displacement of pile during construction;Anti-slide pile will not entirely slide during construction progress. Put forward some construction advices for reducing horizontal displacement of pile.

关 键 词：高临空抗滑桩 回填土施工 挤密压实 有限元 

分 类 号：TU753.8[建筑科学—建筑技术科学]