新型桩基托梁扶壁式挡土墙受力特性影响因素研究  

Influencing factors research of a new type composite retaining wall with double-row-piles and counterfort retaining walls

作　　者：李海平 陶五平 沈为 王伟杰 汤达前 张志军 聂峥 LI Haiping;TAO Wuping;SHEN Wei;WANG Weijie;TANG Daqian;ZHANG Zhijun;NIE Zheng(Hunan Architectural Design Institute Group Co.,Ltd.,Changsha 410012,China)

机构地区：[1]湖南省建筑设计院集团股份有限公司,长沙410012

出　　处：《建筑结构》2022年第22期126-130,113,共6页Building Structure

基　　金：湖南省建筑设计院集团股份有限公司课题(KY0200-0000-2017-0269)。

摘　　要：受周边环境条件约束,高填方工程中呈现多种组合式桩基托梁扶壁式挡土墙。结合某高填方项目条件,设计出一种支撑梁与桩基托梁组合的新型桩基托梁扶壁式挡土墙。为研究该新型挡土墙受力特性及其影响因素,采用有限元软件MIDAS-GTS分别从支撑梁间距、是否设置拉梁及支撑梁基础类型等因素分析支护体系内力及位移变化规律。结果表明,随着支撑梁间距增大,支撑梁轴力及支护桩顶水平位移增大,支护桩身弯矩变化微小;设置拉梁时,支护桩顶水平位移减小,支护桩在拉梁位置产生较大反弯矩突变;支撑梁基础采用桩基时,其支护桩最大弯矩及支护桩顶水平位移均大于支撑梁基础为条形基础的情况。最后,综合分析结果及规范变形控制要求,提出了经济、适用、安全的支护体系方案。Because of being limited by the surrounding environmental conditions,variety types of composite retaining wall with double-row-piles and counterfort retaining walls are used in high-filled engineering.According to the conditions of a high-filled engineering,a new type composite retaining wall with double-row-piles and counterfort retaining walls which combines a support beam with counterfort retaining walls was designed.In order to study the mechanical characteristics and influencing factors of this new type retaining wall,the finite element software MIDAS-GTS was used to analyze the change law of the internal force and displacement of the support system from factors such as the support beam spacing,whether to install the pull beam and the type of the support beam foundations,etc.The results that with the increase of the support beam spacing,the axial force of the support beam and the horizontal displacement of the support pile top increase,and the bending moment of the support pile body changes slightly.When the pull beam is set,the horizontal displacement of the support pile top decreases,and the support pile produce a large sudden change of the reverse bending moment at the pull beam position.When the support beam foundation is pile foundation,the maximun bending moment and the horizontal displacement of support pile top both are larger than those of which the support beam foundation is strip foundation.Finally,an economical,applicable and safe support system scheme was proposed based on the comprehensive analysis results and standard deformation control requirements.

关 键 词：高填方工程 挡土墙 桩基托梁扶壁式挡土墙 支撑梁 拉梁 支护桩 

分 类 号：TU433[建筑科学—岩土工程]