弹性索理论在加筋土挡墙结构设计中的应用研究
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摘要
在差异沉降现象下,现阶段关于加筋土挡墙面板与筋材连接处的结点应力及筋材的变形情况的研究尚少。例如软土地区地基较软处加筋土挡墙易发生差异沉降,其相关理论的不完善也导致了加筋土挡墙的区域适用性降低。为完善加筋土挡墙的设计理论,运用弹性索理论为理论基础,以加筋土挡墙面板与筋材的连接处为研究对象,结合现有的加筋土挡墙变形及其土压力计算理论,提出了一套差异沉降下加筋土挡墙筋材应力分布及其变形曲线的计算方法。通过理论分析,并结合室内模型试验数据验证了该方法的可行性和准确性。该方法具有计算简便,适用广泛等特点,能够较好地解释面板与筋材连接处的破坏形式,对完善加筋土挡墙的设计理论,特别是沉降控制设计方面具有一定的意义。
Under differential settlement, the researches on the joint stress between the reinforced earth retaining wall panel and the reinforced materials and the deformation of the reinforced materials at the present stage are few. For example, differential settlement is prone to occure in the reinforced soil retaining wall of soft soil foundation, and the imperfection of the related theory also leads to the low regional applicability of reinforced soil retaining wall. In order to improve the design theory of the reinforced earth retaining wall, the elastic cable theory is regarded as the theoretical basis. For the joints between the reinforced earth retaining wall and the reinforced materials, based on the existing theories for the deformation and earth pressure of reinforced earth retaining wall, a set of methods for the stress distribution and deformation curves of the reinforced soil retaining wall are established under differential settlement. The feasibility and accuracy of the method are verified through the theoretical analysis and the experimental data of the indoor model. The proposed method has the advantages of simple calculation and wide application, and it can be used to explain the failure mode of the connection between the panel and the reinforced materials. It is of certain guiding significance for the design theory of the reinforced earth retaining wall, especially in the design of settlement control.
Under differential settlement, the researches on the joint stress between the reinforced earth retaining wall panel and the reinforced materials and the deformation of the reinforced materials at the present stage are few. For example, differential settlement is prone to occure in the reinforced soil retaining wall of soft soil foundation, and the imperfection of the related theory also leads to the low regional applicability of reinforced soil retaining wall. In order to improve the design theory of the reinforced earth retaining wall, the elastic cable theory is regarded as the theoretical basis. For the joints between the reinforced earth retaining wall and the reinforced materials, based on the existing theories for the deformation and earth pressure of reinforced earth retaining wall, a set of methods for the stress distribution and deformation curves of the reinforced soil retaining wall are established under differential settlement. The feasibility and accuracy of the method are verified through the theoretical analysis and the experimental data of the indoor model. The proposed method has the advantages of simple calculation and wide application, and it can be used to explain the failure mode of the connection between the panel and the reinforced materials. It is of certain guiding significance for the design theory of the reinforced earth retaining wall, especially in the design of settlement control.
引文
[1]魏丽敏,张军乐,何群.差异沉降对加筋土挡墙筋带内力与变形的影响[J].中国铁道科学,2004,25(5):89–93.(WEI Li-min,ZHANG Jun-le,HE Qun.Influence of differential settlement on internal force and deformation of the reinforcement in reinforced earth retaining wall[J].China Railway Science,2004,25(5):89–93.(in Chinese))
[2]山西省交通厅.公路加筋土工程设计及施工规范汇编[M].北京:人民交通出版社,1993.(Transportation Department of Shanxi Province.Compilation of engineering design and construction specification for highway reinforced soil[M].Beijing:China Communications Press,1993.(in Chinese))
[3]长沙铁道学院.湖南省加筋土支挡结构设计与施工规程(暂行)[M].长沙:国防科技大学出版社,1994.(Changsha Railway Institute.Design and construction rules of reinforced soil retaining structure in hunan province(temporary)[M].Changsha:National Unicersity of Defense Technology,1994.(in Chinese))
[4]JTJ015—91公路加筋土工程设计规范[S].1993.(JTJ015—91 Design code for highway reinforced earth engineering[S].1993.(in Chinese))
[5]WEN X,JIANG J,ZHANG C,et al.Experimental study on performance of multidirectional geogrid and its application in engineering of high slope[J].Journal of Wuhan University of Technology Mater(Sci Ed),2014,29(4):704–711.
[6]何光春.加筋土工程设计与施工[M].北京:人民交通出版社,2000.(HE Guang-chun.Design and construction of reinforced earth engineering[M].Beijing:China Communications Press,2000.(in Chinese))
[7]王荣芳,曹霞.加筋土挡土墙在石环公路工程中的应用[J].市政技术,2013(4):40–42.(WANG Rong-fang,CAO Xia.Application of reinforced earth retaining wall in stone ring highway engineering[J].Municipal Technology,2013(4):40–42.(in Chinese))
[8]黄国伟,方鸿琪.加筋土挡土墙结构的应用[J].工程勘察,2000(6):38–40.(HUANG Guo-wei,FANG Hong-qi.Application of reinforced earth retaining wall structure[J].Geotechnical Investigation&Surveying,2000(6):38–40.(in Chinese))
[9]SONG Y,ZHENG Y,TANG X.Study on the FEM design of reinforced earth retaining wall with geogrid[J].Engineering Sciences,2010(3):71–80.
[10]ZHANG M X,ZHOU H.Model test on sand retaining wall reinforced with denti-strip inclusions[J].Science China Technological Sciences,2008,51(12):2269–2279.
[11]CHEN Q,HE C R,ZHU F Q.Field measurement sand pullout tests of reinforced earth retaining wall[J].Journal of Southwest Jiaotong University,2004(2):165–172.
[12]WANG C,LUAN M,ZHU Z.Model test and numerical analysis on long-term mechanical properties of stepped reinforced retaining wall[J].Transactions of Tianjin University,2012,18:62–68.
[13]OUYANG C J,XU Q,HE S M,et al.A generalized limit equilibrium method for the solution of active earth pressure on a retaining wall[J].Journal of Mountain Science,2013(6):1018–1027.
[14]Japan Society of Civil Engineers.Structural mechanics formula set[M].1st ed.Tokyo:Japan Society of Civil Engineers,1986.
[15]王祥,徐林荣.双级土工格栅加筋土挡墙的测试分析[J].岩土工程学报,2003,25(2):220–224.(WANG Xiang,XU Lin-rong.Testing and analysis of reinforced earth retaining wall with double grade geogrid[J].Chinese Journal of Geotechnical Engineering,2003,25(2):220–224.(in Chinese))
[16]GB T50123土工试验方法标准[S].1999.(GB T50123Standard for soil test method[S].1999.(in Chinese))
[17]British Standard.BS EN ISO 10319 Geotextiles Widewidth tensile test[S].London:British Standard Institution,2008.
[2]山西省交通厅.公路加筋土工程设计及施工规范汇编[M].北京:人民交通出版社,1993.(Transportation Department of Shanxi Province.Compilation of engineering design and construction specification for highway reinforced soil[M].Beijing:China Communications Press,1993.(in Chinese))
[3]长沙铁道学院.湖南省加筋土支挡结构设计与施工规程(暂行)[M].长沙:国防科技大学出版社,1994.(Changsha Railway Institute.Design and construction rules of reinforced soil retaining structure in hunan province(temporary)[M].Changsha:National Unicersity of Defense Technology,1994.(in Chinese))
[4]JTJ015—91公路加筋土工程设计规范[S].1993.(JTJ015—91 Design code for highway reinforced earth engineering[S].1993.(in Chinese))
[5]WEN X,JIANG J,ZHANG C,et al.Experimental study on performance of multidirectional geogrid and its application in engineering of high slope[J].Journal of Wuhan University of Technology Mater(Sci Ed),2014,29(4):704–711.
[6]何光春.加筋土工程设计与施工[M].北京:人民交通出版社,2000.(HE Guang-chun.Design and construction of reinforced earth engineering[M].Beijing:China Communications Press,2000.(in Chinese))
[7]王荣芳,曹霞.加筋土挡土墙在石环公路工程中的应用[J].市政技术,2013(4):40–42.(WANG Rong-fang,CAO Xia.Application of reinforced earth retaining wall in stone ring highway engineering[J].Municipal Technology,2013(4):40–42.(in Chinese))
[8]黄国伟,方鸿琪.加筋土挡土墙结构的应用[J].工程勘察,2000(6):38–40.(HUANG Guo-wei,FANG Hong-qi.Application of reinforced earth retaining wall structure[J].Geotechnical Investigation&Surveying,2000(6):38–40.(in Chinese))
[9]SONG Y,ZHENG Y,TANG X.Study on the FEM design of reinforced earth retaining wall with geogrid[J].Engineering Sciences,2010(3):71–80.
[10]ZHANG M X,ZHOU H.Model test on sand retaining wall reinforced with denti-strip inclusions[J].Science China Technological Sciences,2008,51(12):2269–2279.
[11]CHEN Q,HE C R,ZHU F Q.Field measurement sand pullout tests of reinforced earth retaining wall[J].Journal of Southwest Jiaotong University,2004(2):165–172.
[12]WANG C,LUAN M,ZHU Z.Model test and numerical analysis on long-term mechanical properties of stepped reinforced retaining wall[J].Transactions of Tianjin University,2012,18:62–68.
[13]OUYANG C J,XU Q,HE S M,et al.A generalized limit equilibrium method for the solution of active earth pressure on a retaining wall[J].Journal of Mountain Science,2013(6):1018–1027.
[14]Japan Society of Civil Engineers.Structural mechanics formula set[M].1st ed.Tokyo:Japan Society of Civil Engineers,1986.
[15]王祥,徐林荣.双级土工格栅加筋土挡墙的测试分析[J].岩土工程学报,2003,25(2):220–224.(WANG Xiang,XU Lin-rong.Testing and analysis of reinforced earth retaining wall with double grade geogrid[J].Chinese Journal of Geotechnical Engineering,2003,25(2):220–224.(in Chinese))
[16]GB T50123土工试验方法标准[S].1999.(GB T50123Standard for soil test method[S].1999.(in Chinese))
[17]British Standard.BS EN ISO 10319 Geotextiles Widewidth tensile test[S].London:British Standard Institution,2008.