(1 重庆大学土木工程学院，重庆 400045； 2 山地城镇建设与新技术教育部重点实验室(重庆大学)，重庆 400045； 3 北京国电华北电力工程有限公司，北京 100120)

［摘要］欧洲岩土工程规范Eurocode7直接法中验证地基和结构构件的破坏或过度变形时，给出了不同情况下作用力、岩土参数和反力的分项系数，不同的分项系数组合得到了三种设计方法。案例分析表明，这三种设计方法的结果有较大离散。在偏心受压条形基础和悬臂式挡土墙的设计中，活载的分布决定其分项系数的选择，同时偏心的大小也影响着恒载分项系数的选择；再者，荷载分布的不同，影响着岩土结构设计是对荷载还是对岩土参数更为敏感，因此也就决定了相应的分项系数和更合适的分项系数组合。

［关键词］Eurocode7；极限状态；设计方法；荷载；不利作用；分项系数选择

中图分类号：TU470.3文献标识码：A文章编号：1002-848X(2011)03-0084-04

Selection of different design approaches and related partial factors in ultimate limit state in Eurocode7

Wang Guilin^1,2, Wang Jing¹, Wang Yunbin¹, Li Weike³

(1 School of Civil Engineering, Changqing University, Chongqing 400045, China; 2 Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University), Ministry of Education, Chongqing 400045, China; 3 Beijing North China Electric Power Engineering Co., Ltd., Beijing 100120, China)

Abstract:In geotechnical design by calculation，when considering a limit state of rupture or excessive deformation of a structural element or section of the ground in Eurocode7, three design approaches and relevant partial factors on actions, geotechnical parameters and resistance forces are given. According to the calculations, the results of the three design approaches are discrete. In the design of a retaining wall and the design of a strip foundation subjected to a horizontal live load and a vertical dead load, the distribution of live load determines the partial factors of itself, and the eccentricity determines the partial factors of vertical load. The difference of the distribution of loads determines that the design of geotechnical structures is more sensitive to the loading or to the geotechnical parameters, and also determines the partial factors.

Keywords:Eurocode7; ultimate limit state; design approaches; loads; unfavorable actions; determination of partial factors

*国家重大水专项资助项目(2008ZX07315-001)，重庆市科委自然科学基金项目(CSTC,2008BB0318)。

作者简介：王桂林，博士，副教授，Email：glw@cqu.edu.cn。

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