支撑预应力对围护墙变形与内力的影响规律研究
摘要:预应力内支撑技术对基坑变形有较强的控制能力,但目前内支撑预应力控制基坑变形的规律还没有得到统一认识。为揭示不同预应力方案的变形控制效果,采用二维有限差分软件FLAC,对内支撑施加预应力的基坑进行了研究。通过比较不同的预应力方案和开挖工况下预应力附加给围护墙的位移与弯矩,发现预应力的作用效果在后续的施工过程中基本不发生变化,多道支撑同时施加预应力对围护墙位移和弯矩的影响等于各道支撑单独施加预应力时影响效果的和,并且预应力对围护墙侧移和弯矩的影响量是与预应力大小成正比的,预应力对围护墙的影响主要受支撑相对围护墙位置控制。
Abstract:The prestressed strut has a firm control over the deformation of foundation pit, but a consensus about the regularity of the influence on deformation of foundation pit which is induced by prestress of strut has not been obtained. In order to compare the effects of different prestress schemes, a two-dimensional finite difference software named FLAC is adopted to analyze the foundation pits where the struts is prestressed. By comparing the additional displacement and moment of the retaining wall induced by the prestress of different prestress schemes and on different stages in excavation, it is found that additional displacement and moment of the retaining wall induced by the prestress remains the same on different stages in excavation. The effect of the prestress in several struts functioning simultaneously is equal to the sum of effect of each prestress functioning alone and the additional displacement and moment of the retaining wall is proportional to the size of prestress. The effect on retaining wall induced by prestress is mainly controlled by its relative position to the retaining wall.
中文标题：
支撑预应力对围护墙变形与内力的影响规律研究
Influence on Deformation and Internal Force of Retaining Wall Induced by Prestress of Strut
作者：
刘波1,李杰三2
Liu Bo1,Li Jiesan2
作者简介:刘波,男,1993年生,硕士研究生,主要从事岩土工程数值模拟方面的研究。E-mail:771474496@qq.com
通讯地址：
1. 同济大学地下建筑与工程系, 上海 200092; 2. 驻马店市板桥水库管理局, 河南驻马店 463715
1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China; 2.BanqiaoReservoirAdministrationBureau,Zhumadian463715,Henan,China
中图分类号:TU94
doi:10.3969/j.issn.1007-2993.2017.06.007
出版物：岩土工程技术
收稿日期:2017-06-07
网络出版日期:2021-07-06
关键词:预应力,变形控制,数值模拟,围护墙内力
Key words:prestress,deformation control,numerical simulation,the internal force of retaining structure
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