(湖南省建筑设计院集团股份有限公司, 长沙 410012)

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。

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

中图分类号:TU433 文献标志码:A 文章编号:1002-848X(2022)22-0126-06

DOI:10. 19701 / j. jzjg. ZJ220054

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

LI Haiping, TAO Wuping, SHEN Wei, WANG Weijie, TANG Daqian, ZHANG Zhijun, NIE Zheng

(Hunan Architectural Design Institute Group Co. , Ltd. , Changsha 410012, China)

Abstract:Because of being limited by the surrounding environmental conditions, variety types of composite retaining wallwith double-row-piles and counterfort retaining walls are used in high-filled engineering. According to the conditions of ahigh-filled engineering, a new type composite retaining wall with double-row-piles and counterfort retaining walls whichcombines a support beam with counterfort retaining walls was designed. In order to study the mechanical characteristics andinfluencing factors of this new type retaining wall, the finite element software MIDAS-GTS was used to analyze the changelaw of the internal force and displacement of the support system from factors such as the support beam spacing, whether toinstall the pull beam and the type of the support beam foundations, etc. The results that with the increase of the supportbeam spacing, the axial force of the support beam and the horizontal displacement of the support pile top increase, and thebending moment of the support pile body changes slightly. When the pull beam is set, the horizontal displacement of thesupport pile top decreases, and the support pile produce a large sudden change of the reverse bending moment at the pullbeam position. When the support beam foundation is pile foundation, the maximun bending moment and the horizontaldisplacement 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 analysisresults and standard deformation control requirements.

Keywords:high-filled engineering; retaining wall; composite retaining wall with double-row-piles and counterfort retainingwall; support beam; pull beam; support pile

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

第一作者:李海平,硕士,高级工程师,主要从事基坑、边坡及地基处理方向研究,Email:850926859@ qq. com。

[引用本文] 李海平,陶五平,沈为,等. 新型桩基托梁扶壁式挡土墙受力特性影响因素研究[J]. 建筑结构,2022,52(22):126-130,113. LI Haiping,TAO Wuping,SHEN Wei,et al. Influencing factors research of a new type compositeretaining wall with double-row-piles and counterfort retaining walls [J]. Building Structure,2022,52(22):126-130,113.