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| Seismic Tests and Analysis of Warped Reinforced Earth － retaining Wall |
| LI Qing－hai1，WANG Bing－kun1，JIANG Chu－Sheng1，DUAN Zhong－chen2 |
| 1.China Railway Eryuan Engineering Group Co． Ltd，Chengdu，Sichuan 610031，China; 2.Shenzhen Highway Engineering Consultant Co．Ltd，Shenzhen，Guangzhou 518000，China |
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Abstract Research purposes:According to the engineering features of the Xiangyun Station of Guangtong － Dali Railway，the research was done on the reinforcing mechanism，load bearing，deformation，design methods，computing theory and the failure mode of the wraped reinforced earth － retaining wall under earthquake effect to improve the computing theory and numerical simulation method for the seismic design of the reinforced earth － retaining wall and promote the application of reinforced earth － retaining wall in engineering．
Research conclusions:The warped reinforced earth － retaining wall is better than the ordinary earth － retaining wall in seismic property because the wrapped effect can make seismic wave weak during the propagation and amplification of the seismic wave along the wall up．When in 0.4 g and 0.616 g ，the model produced the evident seismic fall，and cracks happened in the junctions between the wall panel and the reinforced soil and between the reinforced soil and the unreinforced soil．In the peak acceleration，the potential fracture surface of these two kinds of experimental models were distributed in the same position，approximate to 0.45 H vertical line． But in the " Code for Design of Retaining Structure of Railway Subgrade" (TB 10025—2006) ，the potential fracture surface is approximate to 0.3 H vertical line and it slants to unsafety．So the reinforcing length should be increased in design． From the theoretical calculation and the analysis results of the internal and external stability of the reinforced earth － retaining wall obtained by the test data calculation，it was seen the coefficient of sliding resistance，the coefficient of capsizing resistance，the coefficient of uplifting resistance of the whole wall and the coefficient of uplifting resistance of the geogrid in various layers obtained by theoretical calculation were larger than the test data calculation． This showed the current code was unsafe and could be properly modified．
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Received: 23 July 2012
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［1］TB 10025—2006，铁路路基支挡结构设计规范［S］．
TB 10025—2006， Code for Design on Retaining Engineering Structures of Railway Subgrade［S］．
［2］JTG D30—2004，公路路基设计规范［S］．
JTG D30—2004，Code for Design of Highway Subgrade［S］．
［3］JTJ 004—89，公路工程抗震设计规范［S］．
JTJ 004—89，Anti － seismic Design Code for Highway Engineering［S］．
［4］ GB 50111—2006，铁路工程抗震设计规范［S］．
GB 50111—2006， Anti － seismic Design Code for Railway Engineering ［S］．
［5］ 蒋楚生． 土工格栅减小路堤支挡结构土压力的理论分析［J］． 铁道工程学报，2007( 8) :30 －34．
Jiang Chusheng． A Theoretical Analysis of Geo － grids How to Decrease the Earth Pressure Acted on an Embankment Retaining Structure［J］．Journal of Railway Engineering Society，2007( 8) : 30 － 34．
［6］李海光．《铁路路基支挡结构设计规范》( TB10025—2006) 修订情况介绍［J］．铁道工程学报，2007( 1) : 87 －91．
Li Haiguang．Revision of " Code for Design on Retaining Structures of Railway Subgrade"( TB10025—2006) ［J］．Journal of Railway Engineering Society，2007(1) :87 －91．
［7］郑云．高速铁路路堤填筑施工控制技术［J］． 高速铁路技术，2011( 1) :54 －56．
Zheng Yun．Control Technique of Embankment Filling For High － speed Railway［J］．High － speed Railway Technology，2011( 1) : 54 － 56．
［8］李海光，等． 新型支挡结构设计与工程实例［M］．北京: 人民交通出版社，2004．
Li Haiguang，etc． New Retaining Structure Design and Engineering Example［M］． Beijing: China Communications Press，2004．
［9］ GB 50290—98，土工合成材料应用技术规范［S］．
GB 50290—98，Technical Specifications for Application of Geosynthetics［S］．
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2012, Vol. 29 
