复合土钉墙变形性能的三维弹塑性ADINA有限元分析
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摘要
运用大型非线性有限元软件ADINA,模拟某深基坑土钉+水泥土搅拌桩复合土钉墙基坑开挖与支护的施工过程,建立了整体三维有限元模型,模型考虑了基坑的整体空间作用,克服了二维平面或局部的三维有限元模型分析的不足.分别得出了基坑的整体位移、开挖面的水平位移、坑后地面沉降的位移、坑底隆起的位移,并与现场实测值进行了对比.结果表明,计算值与实测值基本吻合,说明建立的非线性有限元计算模型和分析方法是可靠的,能够较好地运用于实际工程的分析和预测.
Based on the nonlinear finite element software ADINA,the construction process of excavation and supporting of the composite soil nailed wall of soil nailing and cement-soil piles for deep foundation excavation is simulated by a whole three-dimensional finite element model.Spatial action of foundation pit was considered in the model.The deficiencies of two-dimensional plane model or a partial spatial one were overcomed.Whole displacement of foundation,the horizontal displacement of excavation face,the subsidence displacement of the ground beside the foundation pit and the bottom heave displacement are obtained,which were compared with the actual measured data.The results show that the finite element analytical results are in agreemennt with those of the field test data.The good agreement shows that the finite element model and analytical method are reliable.The results can satisfy the need of engineering and can be well applied to analyze and predict practical engineering.
Based on the nonlinear finite element software ADINA,the construction process of excavation and supporting of the composite soil nailed wall of soil nailing and cement-soil piles for deep foundation excavation is simulated by a whole three-dimensional finite element model.Spatial action of foundation pit was considered in the model.The deficiencies of two-dimensional plane model or a partial spatial one were overcomed.Whole displacement of foundation,the horizontal displacement of excavation face,the subsidence displacement of the ground beside the foundation pit and the bottom heave displacement are obtained,which were compared with the actual measured data.The results show that the finite element analytical results are in agreemennt with those of the field test data.The good agreement shows that the finite element model and analytical method are reliable.The results can satisfy the need of engineering and can be well applied to analyze and predict practical engineering.
引文
[1]闫丽.复合土钉墙数值分析与承载机理的研究[D].西安:煤炭科学研究总院西安分院,2002.
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[2]朱彦鹏,张宗领,李奕.广州一深基坑土钉支护工作性能的有限元模拟与现场实测对比分析[J].四川建筑科学研究,2008,34(2):144-147.
[3]王进.高层建筑深基坑开挖三维弹性弹塑性有限元分析[D].西安:西安建筑科技大学,2001.
[4]李峰,郭院成,刘建伟,等.桩锚复合土钉基于测斜曲线的主动土压力反演分析[J].信阳师范学院学报:自然科学版,2007,20(4):436-438.
[5]胡孔国,吴京,宋启根.深基坑开挖和支护全过程分析的弹塑性有限元法[J].建筑结构,1999,29(3):34-36.
[6]林琳.复合型土钉支护的有限元分析及工作机理研究[D].湘潭:湘潭大学,2003.
[7]张宗领.复合土钉支护施工过程及地震作用下的有限元分析[D].兰州:兰州理工大学,2007.
[8]陈肇元,崔京浩.土钉支护在基坑工程中的应用[M].2版.北京:中国建筑工业出版社,2000.
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