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| Analysis of Failure Properties of Expansive Soil Subgrade with Particle Flow Simulation |
| ZHENG Li － ning，XIE Qiang，LIU Yan － long ，ZHAO Wen |
| Southwest Jiaotong University，Chengdu，Sichuan 610031，China |
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Abstract Research purposes: Expansive soil has the characteristics of intensive dilation shrinkage and is often in a non － satruated situation． Its strength and volume change with the change of water content，resulting in destruction of buildings． For construction of the expansive soil subgrade of Yuxi － Mengzi Railway，by using particle flow discrete element method，the numerical simulation of wet and dry sizing effect in expansive soils was made with the beginning of changing particle intensity and swelling － shrinking particle size，and the analysis of its failure characteristics and process was made．
Research conclusions: The particle flow discrete element method can reasonably reproduce interior expansive soli and free expansion rate tests with the equilibrium swelling pressure method． From doing the single simulation test and multiple simulation tests to the expansive soil subgrade，the superficial zone slump phenomenon of the expensive soil subgrade under swelling － shrinkage cycle is revealed in the microscopic point of view． Contrasting the failure characteristics of the filled embankment shows the situation of numerical simulation almost tallies with the site situation．
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Received: 15 February 2011
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［1］ 杨和平，赵鹏程，郑健龙． 膨胀土用作路基填料的分类指标体系研究［J］． 岩土工程学报，2009( 2) : 194 － 196．
Yang Heping，Zhao Pengcheng，Zheng Jianlong．Classification of Expansive Soils Used as Embankment Fills［J］． Chinese Journal of Geotechnical Engineering，2009( 2) : 194 － 196．
［2］ 陈孚华． 膨胀土上的基础［M］． 北京: 中国建筑工业出版社，1979．
Chen Fuhua． Foundation on Expansive Soils［M］．Beijing: China Architecture ＆ Building Press，1979．
［3］ 陈铁林，米占宽，陈生水． 膨胀土路基变形的数值模拟［J］． 岩土力学，2005( 增) : 137 － 139．
Chen Tielin，Mi Zhankuan，Chen Shenshui． Numerical Simulation of Deformation of Expansive Soil Roadbed［J］． Rock and Soil Mechanics，2005( supp) : 137 － 139．
［4］ 任青阳，朱以文，王靖涛，等． 膨胀土弹塑性本构关系数值建模方法研究［J］． 岩土力学，2006( 10) : 1699 － 1672．
Ren Qingyang，Zhu Yiwen，Wang Jingtao， etc．Numerical Modeling the Elastoplastic Constitutive Relation of Expansive Soil ［J］． Rock and Soil Mechanics，2006( 10) : 1699 － 1672．
［5］ 韩会增，文江泉，李淑芬． 南昆线膨胀岩( 土) 胀缩特性研究［J］． 西南交通大学学报，1995( 3) : 239 － 242．
Han Huizeng，Wen Jiangquan，Li Shufen． Researeh on the Swelling and Shrinkage of the Swelling Rock along the Nankun Railway［J］． Journal of Southwest Jiaotong University，1995( 3) : 239 － 242．
［6］ 蒋忠信，秦小林，文江泉，等． 广西那桐试验路堑膨胀性红土的地质特性［J］． 铁道工程学报，1998( 3) : 86 － 96．
Jiang Zhongxin，Qin Xiaolin，Wen Jiangquan，etc．Geological Characteristic of Expansive Laterite at Natong Test Cutting of Guangxi Province［J］． Journal of Railway Engineer Society，1998( 3) : 86 － 96．
［7］ C． Wang，D． D． Tannant，P． A． Lilly． Numerical analysis of the stability of heavily jointed rock slopes using PFC2D． ［J］． International Journal of Rock Mechanics ＆ Mining Sciences，2003( 40) : 415 － 424．
［8］ Nick Thompson，Matthew R． Bennett，Nick Petford Development of Characteristic Volcanic Debris Avalanche Deposit Structures: New Insight from Distinct Element Simulations［J］． Journal of Volcanology and Geothermal Research，2010( 192) : 191 － 200．
［9］ Calvetti，F． ，Crosta，G． and Tatarella，M． Numerical Simulation of Dry Granular Flows: from There Production of Small Scale Experiments to the Prediction of Rock Avalanches Rivista Ltaianal ［J］． Di Geotecnica，2000( 2) : 21 － 38．
［10］周健，池永，池毓蔚，等． 颗粒流方法及PFC2D 程序［J］．岩土力学，2000( 3) : 271 － 273 ．
Zhou Jian，Chi Yong，Chi Yuwei，etc． The Method of Particle Flow and PFC2D Code［J］ ． Rock and Soil Mechanics，2000( 3) : 271 － 273．
［11］ 廖世文． 膨胀土与铁路工程［M］． 北京: 中国铁道出版社，1984．
Liao Shiwen． Expansive Soil and Railway Engineering ［M］． Beijing: China Railway Publishing House，1984．
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2011, Vol. 28 
