三点法确定碎石桩复合地基破坏曲线
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摘要
通过对碎石桩复合地基的破坏模式进行分析,对碎石桩复合地基的平面应变理论进行了改进,运用有限元软件建立三维有限元模型进行了辅助分析,得出地基破坏时关键三点M、H及W点的坐标公式,进一步得出碎石桩复合地基的破坏曲线。并将关键三点的计算公式及地基破坏曲线的公式推广到群桩复合地基的计算中。通过对比数值模拟结果与三点法计算结果,发现本文提出的三点法计算误差较小,能够满足精度要求。由此得出能够指导地基承载力推导的破坏曲线方程,可为后续进行碎石桩复合地基承载力计算提供基础。
Through the analysis of the failure mode of the gravel pile composite foundation,improving the plane strain theory of the gravel pile composite foundation,using finite element software to establish 3 D finite element model for auxiliary analysis.Find the coordinate formula of three points M,H and W when the foundation is destroyed.The fracture curve of the gravel pile composite foundation is obtained.Extend the formula of three points and the formula of foundation failure curve to the calculation of pile group composite foundation.By comparing the numerical simulation results with the three-point method,it is found that the three-point method proposed in this paper has less calculation error and can meet the accuracy requirements.The fault curve equation which can guide the foundation bearing capacity is obtained,which provides a basis for the subsequent calculation of the bearing capacity of the gravel pile composite foundation.
Through the analysis of the failure mode of the gravel pile composite foundation,improving the plane strain theory of the gravel pile composite foundation,using finite element software to establish 3 D finite element model for auxiliary analysis.Find the coordinate formula of three points M,H and W when the foundation is destroyed.The fracture curve of the gravel pile composite foundation is obtained.Extend the formula of three points and the formula of foundation failure curve to the calculation of pile group composite foundation.By comparing the numerical simulation results with the three-point method,it is found that the three-point method proposed in this paper has less calculation error and can meet the accuracy requirements.The fault curve equation which can guide the foundation bearing capacity is obtained,which provides a basis for the subsequent calculation of the bearing capacity of the gravel pile composite foundation.
引文
[1] 建筑地基处理技术规范:JGJ 79—2012[S].北京:中国建筑工业出版社,2013.
[2] HUGHES J M O,WITHERS N J,GREENWOOD D A.A field trial of the reinforcing effect of a stone column in soil[J].Geotechnique,1975,25(1):31-44.
[3] PRIEBE H .Absch?tzung des setzungsverhaltens eines durch stopfver-dichtung verbesserten baugrundes[J].Die Bautechnik,1976,53:160-162.
[4] 黎桂香.碎石桩复合地基承载力计算新探讨[J].广东水利水电,2010(6):7-9.
[5] 盛崇文.软土地基用碎石桩加固后的极限承载力计算[J].水利水运科学研究,1980(2):13-16.
[6] BALAAM N P,BROWN P T,POULOS H G.Settlement analysis of soft clays reinforced with granular piles[C]//Southeast Asian Conference on Soil Engineering,1977.
[7] MCCABE B A,EGAN D.Ground improvement and geosynthetics ——A review of the settlement of stone columns in compressible soils[C]//American Society of Civil Engineers Geo Shanghai International Conference 2010- Shanghai China (June 3-5,2010).2010:197-204.
[8] 费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010.
[9] KHABBAZIAN M,KALIAKIN V N,MEEHAN C L.3D numerical analyses of geosynthetic encased stone columns[J].Geotextiles & Geomembrane,2012,35(12):61-68.
[10] 朱奎,徐日庆.置换率对刚-柔性桩复合地基的影响[J].哈尔滨工业大学学报,2009(4):148-152.
[2] HUGHES J M O,WITHERS N J,GREENWOOD D A.A field trial of the reinforcing effect of a stone column in soil[J].Geotechnique,1975,25(1):31-44.
[3] PRIEBE H .Absch?tzung des setzungsverhaltens eines durch stopfver-dichtung verbesserten baugrundes[J].Die Bautechnik,1976,53:160-162.
[4] 黎桂香.碎石桩复合地基承载力计算新探讨[J].广东水利水电,2010(6):7-9.
[5] 盛崇文.软土地基用碎石桩加固后的极限承载力计算[J].水利水运科学研究,1980(2):13-16.
[6] BALAAM N P,BROWN P T,POULOS H G.Settlement analysis of soft clays reinforced with granular piles[C]//Southeast Asian Conference on Soil Engineering,1977.
[7] MCCABE B A,EGAN D.Ground improvement and geosynthetics ——A review of the settlement of stone columns in compressible soils[C]//American Society of Civil Engineers Geo Shanghai International Conference 2010- Shanghai China (June 3-5,2010).2010:197-204.
[8] 费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010.
[9] KHABBAZIAN M,KALIAKIN V N,MEEHAN C L.3D numerical analyses of geosynthetic encased stone columns[J].Geotextiles & Geomembrane,2012,35(12):61-68.
[10] 朱奎,徐日庆.置换率对刚-柔性桩复合地基的影响[J].哈尔滨工业大学学报,2009(4):148-152.