复合土钉支护转角有利影响范围
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摘要
基坑复合土钉墙转角处有明显的空间效应,受力变形较小,对支护结构有利,但不清楚转角定量的有利影响范围,目前设计中仍按照与基坑中部一样保守设计,为在此范围内降低土钉用量,避免保守设计,对水泥土搅拌桩复合土钉支护结构建立了全尺寸整体三维有限元模型,这种模型包含基坑的转角,能考虑基坑的空间效应,通过建立接触面单元,能考虑土体和搅拌桩、土体和土钉的相互作用,量化分析了基坑转角对支护结构受力和变形的有利影响范围,计算结果表明,基坑转角对开挖面水平位移、地表沉降、坑底隆起、土钉轴力的有利影响范围分别约为1.3、1、1、1.2倍的开挖深度。经与实际工程现场实测值对比,验证了该模型分析结果的可靠性,同时分析结果优于平面二维和局部三维有限元模型,结论为复合土钉支护结构的优化设计和安全施工提供了理论依据和研究方法。
Foundation pit corner of composite soil nailed wall has obvious spatial effect.Supporting structure near foundation pit corner is safer due to smaller stress and deformation,Whilst at present quantitative beneficial affected area of foundation pit corner to the supporting structure are not known and designs are the same in the middle and the corner of foundation pit.In order to reduce the material consumption and avoid overcautious design,the construction process of excavation and supporting of the composite soil nailed wall of soil nailing and cement-soil piles for deep foundation excavation was simulated through establishing a whole three-dimensional finite element model,which includes the corner of the foundation pit and can consider spatial effect of corner location and the interaction between soil nailing,cement-soil piles and soil through establishing interface elements.Beneficial affected area of foundation pit corner to stress and deformation of the supporting structure is analyzed and quantified.The calculation results show thatbeneficial affected area of foundation pit corner to the horizontal displacement of excavation face,the subsidence displacement of the ground beside the foundation pit,the bottom heave displacement and the axial forces of soil nails are about 1.3times,1times,1times,1.2times of the excavation depth.Whole three-dimensional finite element calculation results are basically consistent with those of the field test data and are more reliable than two-dimensional or local three-dimensional.These conclusions can provide theory basis and research method for optimization design and safety construction of composite soil nailed wall.
Foundation pit corner of composite soil nailed wall has obvious spatial effect.Supporting structure near foundation pit corner is safer due to smaller stress and deformation,Whilst at present quantitative beneficial affected area of foundation pit corner to the supporting structure are not known and designs are the same in the middle and the corner of foundation pit.In order to reduce the material consumption and avoid overcautious design,the construction process of excavation and supporting of the composite soil nailed wall of soil nailing and cement-soil piles for deep foundation excavation was simulated through establishing a whole three-dimensional finite element model,which includes the corner of the foundation pit and can consider spatial effect of corner location and the interaction between soil nailing,cement-soil piles and soil through establishing interface elements.Beneficial affected area of foundation pit corner to stress and deformation of the supporting structure is analyzed and quantified.The calculation results show thatbeneficial affected area of foundation pit corner to the horizontal displacement of excavation face,the subsidence displacement of the ground beside the foundation pit,the bottom heave displacement and the axial forces of soil nails are about 1.3times,1times,1times,1.2times of the excavation depth.Whole three-dimensional finite element calculation results are basically consistent with those of the field test data and are more reliable than two-dimensional or local three-dimensional.These conclusions can provide theory basis and research method for optimization design and safety construction of composite soil nailed wall.
引文
[1]付文光,杨志银,刘俊岩,等.复合土钉墙的若干理论问题、兼论《复合土钉墙基坑支护技术规范》[J].岩石力学与工程学报,2012,31(11):2291-2304.FU W G,YANG Z Y,LIU J Y,et al.Some theoretical questions of composite soil nailing wall and discussion on Technical Code for Composite Soil Nailing Wall in Retaining and Protection of Excavation[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(11):2291-2304.(in Chinese)
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[3]刘日成,张芹,王育奎.复合土钉墙支护效果数值模拟[J].地下空间与工程学报,2012,8(1):182-188.LIU R C,ZHANG Q,WANG Y K,et al.Numerical simulation of composite soil nailed wall[J].Chinese Journal of Underground Space and Engineering.2012,8(1):182-188.(in Chinese)
[4]付文光,杨志银.复合土钉墙整体稳定性验算公式研究[J].岩土工程学报,2012,34(4):742-747.FU W G,YANG Z Y.Formulae for overall stability of composite soil nailing walls[J].Chinese Journal of Geotechnical Engineering,2012,34(4):742-747.(in Chinese)
[5]俞缙,王艳芳,宋博学.复合土钉支护的软土基坑开挖有限元模拟分析[J].华侨大学学报(自然科学版),2011,32(2):212-217.YU J,WANG Y F,SONG B X.FEM simulation of composite soil nailing supported excavation in soft clay pit[J].Journal of Huaqiao University(Natural Science),2011,32(2):212-217.(in Chinese)
[6]李彦初,陈轮.深基坑复合土钉支护的三维有限元数值分析[J].工程勘察,2012(2):11-15,32.LI Y C,CHEN L.3Dnumerical analysis on composite soil nailed structure for deep excavation with FEM[J].Geotechnical Investigation&Surveying,2012(2):11-15,32.(in Chinese)
[7]潘泓,周陈发,曹洪.复合土钉墙的角部空间效应及变形性状分析[J].岩土力学,2008,29(2):333-336.PAN H,ZHOU C F,CAO H.Analysis of spatial effectand deformation of corner of composite soil nailing walls[J].Rock and Soil Mechanics,2008,29(2):333-336.(in Chinese)
[8]OU CU,CHIOU D C,WU T S.Three-dimensional finite element analysis of deep excavations[J].Geotechnical Engineering,ASCE,1996,122(5):337-345.
[9]SMITH I M.Three-dimensional FE analysis of a nailed soil wall curved in plan[J].International Journal for Numerical and Analytical Methods in Geomechanics,1997,21(9):583-597.
[10]张宗领,张昊,付超,等.钉距和微预应力对复合土钉墙性能影响的有限元分析[J].信阳师范学院学报(自然科学版),2012,25(3):416-420.ZHANG Z L,ZHANG H,FU C,et al.Finite element analysis of the influence of the distance of nails and small prestress on behavior of composite soil nailed wall[J].Journal of Xinyang Normal University(Natural Science Edition),2012,25(3):416-420.(in Chinese)
[11]徐帮树,刘日成,李连祥,等.复合土钉墙支护设计参数敏感性分析及边坡变形规律研究[J].岩土力学,2011,32(2):393-400.XU B S,LIU R C,LI L X,et al.Study of slope deformation and parameters sensitivity in supporting design of composite soil nailing wall[J].Rock and Soil Mechanics,2011,32(2):393-400.(in Chinese)
[12]SMITH I M.Three-dimensional analysis of reinforced and nailed soil[C]//Proceedings of the International Symposium on Numerical Models in Geomechanics.Rotterdam:Balkema A A,1992:829-838.
[13]HO D K H,SMITH I M.Modelling of soil nailing construction by 3-dimensional finite element analysis[C]//Proceedings of Conference on Retaining Structures,Cambridge:[s.n.],1992:515-528.
[14]TABRIZI S K.3-D finite element modeling of soilnailed wall[D].New Jesey:The State University of New Jesey,1996:550-563
[15]李连祥,王春华,周婷婷,等.微型桩与帷幕的不同位置对复合土钉墙力学性状的影响分析[J].岩土力学,2015,36(Sup1):501-505.LI L X,WANG C H,ZHOU T T,et al.Impact of position of micro pile on mechanical behaviors of composite soil nailing wall curtain[J].Rock and Soil Mechanics,2015,36(Sup1):501-505.(in Chinese)
[16]周健,李飞,张姣,等.复合土钉墙支护基坑颗粒流数值模拟研究[J].同济大学学报(自然科学版),2011,39(7):966-971.ZHOU J,LI F,ZHANG J,et al.Study of PFC numerical simulation of soil nailing wall support excavation[J].Journal of Tongji University(Natural Science),2011,39(7):966-971.(in Chinese)
[17]杨育文.复合土钉墙实例分析和变形评估[J].岩土工程学报,2012,34(4):734-741.YANG Y W.Case studies of composite soil-nailing walls and movement estimate[J].Chinese Journal of Geotechnical Engineering,2012,34(4):734-741.(in Chinese)
[2]FU W G.The application of composite soil nailing wall in China[J].Japanese Geotechnical Society Special Publication,2016,2(64):2192-2195.
[3]刘日成,张芹,王育奎.复合土钉墙支护效果数值模拟[J].地下空间与工程学报,2012,8(1):182-188.LIU R C,ZHANG Q,WANG Y K,et al.Numerical simulation of composite soil nailed wall[J].Chinese Journal of Underground Space and Engineering.2012,8(1):182-188.(in Chinese)
[4]付文光,杨志银.复合土钉墙整体稳定性验算公式研究[J].岩土工程学报,2012,34(4):742-747.FU W G,YANG Z Y.Formulae for overall stability of composite soil nailing walls[J].Chinese Journal of Geotechnical Engineering,2012,34(4):742-747.(in Chinese)
[5]俞缙,王艳芳,宋博学.复合土钉支护的软土基坑开挖有限元模拟分析[J].华侨大学学报(自然科学版),2011,32(2):212-217.YU J,WANG Y F,SONG B X.FEM simulation of composite soil nailing supported excavation in soft clay pit[J].Journal of Huaqiao University(Natural Science),2011,32(2):212-217.(in Chinese)
[6]李彦初,陈轮.深基坑复合土钉支护的三维有限元数值分析[J].工程勘察,2012(2):11-15,32.LI Y C,CHEN L.3Dnumerical analysis on composite soil nailed structure for deep excavation with FEM[J].Geotechnical Investigation&Surveying,2012(2):11-15,32.(in Chinese)
[7]潘泓,周陈发,曹洪.复合土钉墙的角部空间效应及变形性状分析[J].岩土力学,2008,29(2):333-336.PAN H,ZHOU C F,CAO H.Analysis of spatial effectand deformation of corner of composite soil nailing walls[J].Rock and Soil Mechanics,2008,29(2):333-336.(in Chinese)
[8]OU CU,CHIOU D C,WU T S.Three-dimensional finite element analysis of deep excavations[J].Geotechnical Engineering,ASCE,1996,122(5):337-345.
[9]SMITH I M.Three-dimensional FE analysis of a nailed soil wall curved in plan[J].International Journal for Numerical and Analytical Methods in Geomechanics,1997,21(9):583-597.
[10]张宗领,张昊,付超,等.钉距和微预应力对复合土钉墙性能影响的有限元分析[J].信阳师范学院学报(自然科学版),2012,25(3):416-420.ZHANG Z L,ZHANG H,FU C,et al.Finite element analysis of the influence of the distance of nails and small prestress on behavior of composite soil nailed wall[J].Journal of Xinyang Normal University(Natural Science Edition),2012,25(3):416-420.(in Chinese)
[11]徐帮树,刘日成,李连祥,等.复合土钉墙支护设计参数敏感性分析及边坡变形规律研究[J].岩土力学,2011,32(2):393-400.XU B S,LIU R C,LI L X,et al.Study of slope deformation and parameters sensitivity in supporting design of composite soil nailing wall[J].Rock and Soil Mechanics,2011,32(2):393-400.(in Chinese)
[12]SMITH I M.Three-dimensional analysis of reinforced and nailed soil[C]//Proceedings of the International Symposium on Numerical Models in Geomechanics.Rotterdam:Balkema A A,1992:829-838.
[13]HO D K H,SMITH I M.Modelling of soil nailing construction by 3-dimensional finite element analysis[C]//Proceedings of Conference on Retaining Structures,Cambridge:[s.n.],1992:515-528.
[14]TABRIZI S K.3-D finite element modeling of soilnailed wall[D].New Jesey:The State University of New Jesey,1996:550-563
[15]李连祥,王春华,周婷婷,等.微型桩与帷幕的不同位置对复合土钉墙力学性状的影响分析[J].岩土力学,2015,36(Sup1):501-505.LI L X,WANG C H,ZHOU T T,et al.Impact of position of micro pile on mechanical behaviors of composite soil nailing wall curtain[J].Rock and Soil Mechanics,2015,36(Sup1):501-505.(in Chinese)
[16]周健,李飞,张姣,等.复合土钉墙支护基坑颗粒流数值模拟研究[J].同济大学学报(自然科学版),2011,39(7):966-971.ZHOU J,LI F,ZHANG J,et al.Study of PFC numerical simulation of soil nailing wall support excavation[J].Journal of Tongji University(Natural Science),2011,39(7):966-971.(in Chinese)
[17]杨育文.复合土钉墙实例分析和变形评估[J].岩土工程学报,2012,34(4):734-741.YANG Y W.Case studies of composite soil-nailing walls and movement estimate[J].Chinese Journal of Geotechnical Engineering,2012,34(4):734-741.(in Chinese)
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