(1 天津大学建筑工程学院，天津 300072； 2 天津城市建设学院土木工程系，天津 300384；

3 中水北方勘测设计研究有限责任公司，天津 300222)

［摘要］基于双排桩支护结构设计的基本理论、简化模型及内力计算方法，用ANSYS有限元软件建立平面应变模型，对双排桩支护结构进行分析与研究，讨论前后排桩排距、桩身刚度等因素对围护结构侧向位移及桩身内力的影响。通过比较分析得出，前、后排桩与桩间土协同作用效果明显，双排支护桩结构具有较大的侧向刚度，可有效地限制围护结构的侧向变形；排距对双排桩支护结构受力影响较大，当排距为3～8倍桩径时，前后排桩可较好地发挥抵抗侧向变形的能力，合理选择排距可获得较好的支护效果。

［关键词］双排桩；支护结构；受力分析；影响因素

Analysis on stressed deformation and affected factors of doublerow pile retaining structure

 Yang Dejian 1，2, Wang Tiecheng 1, Yin Jianfeng 3

(1 Col. of Civil Eng.， Tianjin Uni., Tianjin 300072, China; 2 Dep. of Civil Eng., Tianjin Ins. of Urban Construction, Tianjin 300384, China;

  3 China Water Resources Beifang Investigation Design and Research Co., Ltd., Tianjin 300222, China)

Abstract:A foundamental theory，simple model and stress analysis method for the double-line pile retaining structure design are introduced. The finite element process ANSYS is used to set up the model of double-row pile retaining. By analyzing the effects of the distance, pile rigidity, distance of piles and other factors on the deformation and bending moment of the structure are discussed. With the effective co-operation of double-line piles and soil, the double-line piles retaining structure can confine side direction deformation effectively, and the double-line pile retaining structure has strong lateral rigidity. The bearing performance of retaining structure is influenced by the distance of two lines of piles, and it is showed that the best distance is 3～8 times of the pile diameter.

Keywords:double-row pile；retaining structure；stressed analysis；affected factors

*天津市高等学校科技发展基金项目(2005xk1)。