加筋格宾挡墙破裂面及承载力特性研究
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摘要
在加筋格宾挡墙筋材原型观测试验和数值模拟的基础上,对不同加筋规范所采用的破裂面进行了比较分析,提出了改进双折线型潜在破裂面,并通过加筋格宾挡土墙实体工程的现场观测结果,进一步分析了改进双折线型潜在破裂面的优点。结果表明:采用改进双折线型破裂面计算,比公路规范和BS8006规范安全,比铁路规范经济。采用极限平衡法,推导了双折线型破裂面在拉力破坏和粘着破坏时的墙顶部表面通用承载力计算公式,统一了0.3H简化破裂面和朗肯破裂面形式下的承载力计算公式。
Based on the prototype preservation and numerical analysis of a reinforced gabion retaining wall,the failure surfaces adopted by different design manuals are compared and analyzed and the improved double line simplified failure surface model is proposed for reinforced earth retaining wall with double-twisted hexagonal steel wire mesh.After analyzed the results obtain by a field test done in a reinforced gabion retaining wall,the advantages of improved double line simplified failure surface model were analyzed further.The results show that it is safer to adopt the double line simplified failure surface for calculation than the highway specifications and BS8006,economicer than the railway specifications.Finally,on the basis of double line simplified failure surface,the bearing capacity formula of the top surface of backfill behind reinforced earth retaining wall under two failure modes is introduced by the limit equilibrium method,which unifies the bearing capacity formula of the 0.3H simplified failure surface and that of the Rankine failure surface.
Based on the prototype preservation and numerical analysis of a reinforced gabion retaining wall,the failure surfaces adopted by different design manuals are compared and analyzed and the improved double line simplified failure surface model is proposed for reinforced earth retaining wall with double-twisted hexagonal steel wire mesh.After analyzed the results obtain by a field test done in a reinforced gabion retaining wall,the advantages of improved double line simplified failure surface model were analyzed further.The results show that it is safer to adopt the double line simplified failure surface for calculation than the highway specifications and BS8006,economicer than the railway specifications.Finally,on the basis of double line simplified failure surface,the bearing capacity formula of the top surface of backfill behind reinforced earth retaining wall under two failure modes is introduced by the limit equilibrium method,which unifies the bearing capacity formula of the 0.3H simplified failure surface and that of the Rankine failure surface.
引文
[1]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.Test and analysis of two-step retaining wall reinforced by geogrid[J].ChineseJournal of Geotechnical Engineering,2003,25(2):220?224.
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[3]高江平,俞茂宏,胡长顺,等.加筋土挡墙滑动破裂面的大型模型试验[J].长安大学学报:自然科学版,2005,25(6):6?9.GAO Jiang-ping,YU Mao-hong,HU Chang-shun,et al.Large model experiment on sliding rupture of reinforcedearth retaining wall[J].Journal of Chang’an University:Natural Science Edition,2005,25(6):6?9.
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[6]林宇亮,杨果林,李昀,等.绿色加筋格宾挡墙工程特性试验研究[J].岩土力学,2010,31(10):3113-3119.LIN Yu-liang,YANG Guo-lin,LI Yun,et al.Test studyof engineering properties of green reinforced gabion retai-ning wall[J].Rock and Soil Mechanics,2010,31(10):3113-3119.
[7]林宇亮,杨果林,李昀,等.加筋格宾挡墙在重复荷载作用下动变形特性试验研究[J].岩石力学与工程学报,2009,28(增2):4027-4033.LIN Yu-liang,YANG Guo-lin,LI Yu,et al.Test studyon dynamic deformation behavior of reinforced gabion re-taining wall under cyclic load[J].Chinese Journal ofRock Mechanics and Engineering,2009,28(S2):4027-4033.
[8]李昀,杨果林,林宇亮.土工格栅加筋土挡墙地震响应分析[J].铁道科学与工程学报,2009,16(3):22-27.LI Yun,YANG Guo-lin,LIN Yu-liang.Analysis on seis-mic behavior of geogrid reinforced retaining wall subjectedto seismic loading[J].Journal of Railway Science and En-gineering,2009,16(3):22-27.
[9]中华人民共和国交通部.JTJ015-91公路加筋土工程设计规范[S].北京:人民交通出版社,1999.Ministry of Transport of People’s Republic of China.JTJ015-91 Specifications for design of highway reinforcedearth engineering[S].Beijing:China CommunicationsPress,1999.
[10]中华人民共和国铁道部.TB 10025—2006铁路路基支挡结构设计规范[S].北京:中国铁道出版社,2006.Ministry of Railway of People′s Republic of China.TB10025-2006 Code for design on retaining structures ofrailway subgrade[S].Beijing:China Railway PublishingHouse,2006.
[11]British Standard BS8006,1995.Code of practice forstrengthened/reinforced soils and other fills[S].BritishStandard Institution,London.
[12]雷胜友.V形沟谷加筋土支挡结构强度特性分析[J].重庆交通学院学报,2001,20(1):65-69.LEI Sheng-you.Analysis on the strength property of rein-forced earth retaining structure(wall)in the V-shapedgully[J].Journal of Chongqing Jiaotong University,2001,20(1):65?69.
[13]杨果林,王永和.钢筋(煤矸石)混凝土网格式加筋土挡土结构强度特性与试验研究[J].岩土工程学报,1999,21(5):534?539.YANG Guo-lin,WANG Yong-he.Strength proper ty ofRC net reinforced each retaining structure and its experi-mental study[J].Chinese Journal of Geotechnical Engi-neering,1999,21(5):534?539.
[2]周世良,汪承志,何光春,等.台阶式格栅加筋挡墙潜在破裂面计算模式研究[J].公路交通科技,2007,24(11):15-20.ZHOU Shi-liang,WANG Cheng-zhi,HE Guang-chun,etal.Study on rational model of potential surface for steppedgeogrid reinforced soil retaining wall[J].Journal of High-way and Transportation Research and Development,2007,24(11):15?20.(in Chinese)
[3]高江平,俞茂宏,胡长顺,等.加筋土挡墙滑动破裂面的大型模型试验[J].长安大学学报:自然科学版,2005,25(6):6?9.GAO Jiang-ping,YU Mao-hong,HU Chang-shun,et al.Large model experiment on sliding rupture of reinforcedearth retaining wall[J].Journal of Chang’an University:Natural Science Edition,2005,25(6):6?9.
[4]欧阳仲春.现代土工加筋技术[M].北京:人民交通出版社,1991.OUYANG Zhong-chun.The technology of modern rein-forced earth[M].Beijing:China Communications Press,1991.
[5]U.S.Department of Transportation and Federal HighwayAdministration.FHWA-NHI-00-043 MechanicallyStabilized Earth Walls and Reinforced Soil Slopes Design&Construction Guidelines[S].Washington,D.C.:Na-tional Highway Institute Office of Bridge Technology,2001.
[6]林宇亮,杨果林,李昀,等.绿色加筋格宾挡墙工程特性试验研究[J].岩土力学,2010,31(10):3113-3119.LIN Yu-liang,YANG Guo-lin,LI Yun,et al.Test studyof engineering properties of green reinforced gabion retai-ning wall[J].Rock and Soil Mechanics,2010,31(10):3113-3119.
[7]林宇亮,杨果林,李昀,等.加筋格宾挡墙在重复荷载作用下动变形特性试验研究[J].岩石力学与工程学报,2009,28(增2):4027-4033.LIN Yu-liang,YANG Guo-lin,LI Yu,et al.Test studyon dynamic deformation behavior of reinforced gabion re-taining wall under cyclic load[J].Chinese Journal ofRock Mechanics and Engineering,2009,28(S2):4027-4033.
[8]李昀,杨果林,林宇亮.土工格栅加筋土挡墙地震响应分析[J].铁道科学与工程学报,2009,16(3):22-27.LI Yun,YANG Guo-lin,LIN Yu-liang.Analysis on seis-mic behavior of geogrid reinforced retaining wall subjectedto seismic loading[J].Journal of Railway Science and En-gineering,2009,16(3):22-27.
[9]中华人民共和国交通部.JTJ015-91公路加筋土工程设计规范[S].北京:人民交通出版社,1999.Ministry of Transport of People’s Republic of China.JTJ015-91 Specifications for design of highway reinforcedearth engineering[S].Beijing:China CommunicationsPress,1999.
[10]中华人民共和国铁道部.TB 10025—2006铁路路基支挡结构设计规范[S].北京:中国铁道出版社,2006.Ministry of Railway of People′s Republic of China.TB10025-2006 Code for design on retaining structures ofrailway subgrade[S].Beijing:China Railway PublishingHouse,2006.
[11]British Standard BS8006,1995.Code of practice forstrengthened/reinforced soils and other fills[S].BritishStandard Institution,London.
[12]雷胜友.V形沟谷加筋土支挡结构强度特性分析[J].重庆交通学院学报,2001,20(1):65-69.LEI Sheng-you.Analysis on the strength property of rein-forced earth retaining structure(wall)in the V-shapedgully[J].Journal of Chongqing Jiaotong University,2001,20(1):65?69.
[13]杨果林,王永和.钢筋(煤矸石)混凝土网格式加筋土挡土结构强度特性与试验研究[J].岩土工程学报,1999,21(5):534?539.YANG Guo-lin,WANG Yong-he.Strength proper ty ofRC net reinforced each retaining structure and its experi-mental study[J].Chinese Journal of Geotechnical Engi-neering,1999,21(5):534?539.
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