半刚性水泥搅拌桩软基加固特性及回填分层施工影响研究
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摘要
水泥搅拌桩加固处理的海堤软基沉降计算目前多以复合地基法为主,为研究半刚性水泥搅拌桩软基加固特性,探讨上部堤心石分层回填施工对其影响,采用PLAXIS 3D岩土有限元软件对海堤进行整体三维有限元数值模拟,其中水泥搅拌桩采用实体桩建模,从而避免了复合地基法的计算假定,更真实的反映软土地基加固的变形性质。结果表明:适当减小分层层数对地表沉降以及水泥搅拌桩的内力及变形影响很小,从而可以缩短工期、降低施工成本。研究结果为类似工程设计与施工提供参考。
The settlement calculation of soft foundation under seawall reinforced by cement mixing piles is mainly based on the composite foundation calculation method. PLAXIS 3 D software with the solid pile method was used to analyze the characteristics of the semi-rigid cement soil mixing piles and to discuss the influence of the number of construction layers in longitudinal direction of seawall structure, thus assumption of the composite foundation calculation method can be avoided and the properties of soft foundation can be truly reflected. The results show that the construction layers have little influence on the surface settlement of seawall and the stress and deformation of cement mixing piles, which can reduce the construction cost and period and provide references for similar engineering design work.
The settlement calculation of soft foundation under seawall reinforced by cement mixing piles is mainly based on the composite foundation calculation method. PLAXIS 3 D software with the solid pile method was used to analyze the characteristics of the semi-rigid cement soil mixing piles and to discuss the influence of the number of construction layers in longitudinal direction of seawall structure, thus assumption of the composite foundation calculation method can be avoided and the properties of soft foundation can be truly reflected. The results show that the construction layers have little influence on the surface settlement of seawall and the stress and deformation of cement mixing piles, which can reduce the construction cost and period and provide references for similar engineering design work.
引文
[1]郑刚, 王长祥, 顾晓鲁. 软土中超长水泥搅拌桩复合地基承载力研究[J]. 岩土工程学报, 2002, 24(6):675-679.ZHENG G, WANG C X, GU X L. Bearing capacity of composite foundation with long cement treated column in soft soil[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(6):675-679.
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[4]徐宾宾, 张羽, 司维. 基于Plaxis3D的老鹰山隧道超长破碎带隧道开挖仿真分析[J]. 中国港湾建设, 2017, 37(9):16-20.XU B B, ZHANG Y, SI W. Excavation numerical simulation of super-long broken zone in Laoying mountain tunnel based on Plaxis3D[J]. China Harbour Engineering, 2017, 37(9):16-20.
[5]凌光容, 安海玉, 谢岱宗,等. 劲性搅拌桩的试验研究[J]. 建筑结构学报, 2001, 22(2):92-96. LING G R, AN H Y, XIE D Z, et al. Experimental Study on Concrete Core Mixing Pile[J].Journal of Building Structures, 2001, 22(2):92-96.
[6]李志刚, 王福强, 王婷婷. PLAXIS数值模拟在分离卸荷式钢管板桩码头计算中的应用[J]. 港工技术, 2017(6):43-48.LI Z G, WANG F Q, WANG T T. Application of PLAXIS Numerical Simulation in Calculation of Separated Unloading Type Berth Structure Supported on Steel Tube Sheet Piles[J].Port Engineering Technology, 2017(6):43-48.
[7]Bathe K J, Ramm E, Wilson E L. Finite element formulations for large deformation dynamic analysis[J]. International Journal for numerical methods in engineering, 1975, 9(2): 353-386.
[8]JGJ120-2012,建筑基坑支护技术规程[S].
[2]池跃君, 宋二祥, 金淮,等. 刚性桩复合地基应力场分布的试验研究[J]. 岩土力学, 2003, 24(3):339-343.CHI Y J, SONG E X, JIN H, et al. Experimental study on stress distribution of composite foundation with rigid piles[J].Rock and Soil Mechanics, 2003, 24(3):339-343.
[3]金德钢. 软土地基海堤沉降的有限元模拟[J]. 岩土工程技术, 2012, 26(1):40-45.JIN D G. Finite Element Simulation on Settlement of Soft Seawall[J]. Geotechnical Engineering Technique, 2012, 26(1): 40-45.
[4]徐宾宾, 张羽, 司维. 基于Plaxis3D的老鹰山隧道超长破碎带隧道开挖仿真分析[J]. 中国港湾建设, 2017, 37(9):16-20.XU B B, ZHANG Y, SI W. Excavation numerical simulation of super-long broken zone in Laoying mountain tunnel based on Plaxis3D[J]. China Harbour Engineering, 2017, 37(9):16-20.
[5]凌光容, 安海玉, 谢岱宗,等. 劲性搅拌桩的试验研究[J]. 建筑结构学报, 2001, 22(2):92-96. LING G R, AN H Y, XIE D Z, et al. Experimental Study on Concrete Core Mixing Pile[J].Journal of Building Structures, 2001, 22(2):92-96.
[6]李志刚, 王福强, 王婷婷. PLAXIS数值模拟在分离卸荷式钢管板桩码头计算中的应用[J]. 港工技术, 2017(6):43-48.LI Z G, WANG F Q, WANG T T. Application of PLAXIS Numerical Simulation in Calculation of Separated Unloading Type Berth Structure Supported on Steel Tube Sheet Piles[J].Port Engineering Technology, 2017(6):43-48.
[7]Bathe K J, Ramm E, Wilson E L. Finite element formulations for large deformation dynamic analysis[J]. International Journal for numerical methods in engineering, 1975, 9(2): 353-386.
[8]JGJ120-2012,建筑基坑支护技术规程[S].