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浙江大学学报(工学版)  2020, Vol. 54 Issue (5): 899-908    DOI: 10.3785/j.issn.1008-973X.2020.05.007
土木工程、交通工程     
挡墙任意变位模式诱发周围土体水平位移的简化算法
程康1,2(),徐日庆1,2,*(),林存刚3,梁荣柱4,单华峰5,赵明6
1. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州 310058
2. 浙江省城市地下空间开发工程技术研究中心,浙江 杭州 310058
3. 挪威岩土工程研究所,挪威 奥斯陆 0806
4. 中国地质大学(武汉) 工程学院,湖北 武汉 410074
5. 台州学院 滨海环境与岩土工程研究所,浙江 台州 318000
6. 浙江广播电视集团,浙江 杭州 310000
Simplified method for predicting surrounding soil’s horizontal displacement caused by arbitrary deflection of retaining wall
Kang CHENG1,2(),Ri-qing XU1,2,*(),Cun-gang LIN3,Rong-zhu LIANG4,Hua-feng SHAN5,Ming ZHAO6
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China
3. Norwegian Geotechnical Institute, Oslo 0806, Norway
4. Engineering Faculty, China University of Geosciences (Wuhan), Wuhan 410074, China
5. Institute of Coastal Environment and Geotechnical Engineering, Taizhou University, Taizhou 318000, China
6. Zhejiang Radio and Television Group, Hangzhou 310000, China
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摘要:

将挡墙变位引起墙外土体水平位移视作平面应变条件下的位移-位移边值问题,借助刚性挡墙平移变位诱发墙外土体水平位移的基本解,利用微元法及叠加原理,提出在挡墙任意变位模式下的周围土体水平位移简化计算方法. 分别与挡墙刚性变位、柔性变位模式下的土体水平位移现场实测数据进行对比,发现简化计算法可以较好地预测墙外土体水平位移,验证了所提简化算法的准确性. 在土体最大水平位移上,简化算法的预测较实测偏保守,表明将简化算法应用于工程实践是偏安全的. 进一步参数分析发现,随着土体距围护结构距离的增大,土体最大水平位移迅速减小,且在最大位移深度以上存在某一临界位置,在该位置以上土体水平位移随其到围护结构距离的增大而增大,在该临界位置以下,变化规律则相反.

关键词: 平面应变微元法挡墙变位水平位移简化计算方法    
Abstract:

The horizontal movement of soil behind retaining wall caused by the movement of retaining wall was regarded as displacement-displacement boundary problem under plane strain condition. The simplified method for cacluating horizontal displacement of surrounding soil was derived under arbitrary movement mode of retaining wall, using the basic analytic solutions of horizontal displacement of soil induced by translational displacement of rigid retaining wall, as well as the infinitesimal element method and superposition technique. Comparison of soil horizontal displacement between the calculated results derived from the proposed method under both rigid and flexible deflection modes of retaining wall, and the field monitoring data shows that the proposed method can reasonably predict the soil horizontal displacement. Thus the accuracy of the proposed simplified method is verified. The maximum horizontal displacement of soil is slightly overestimated by the proposed simplified method, thus the application of simplified calculation method to engineering practice is safe. Further parameter analysis suggests that the maximum horizontal displacement decreases rapidly with the increase of the distance between soil and enclosure structure. Above the maximum displacement depth, there is a critical position, above which the horizontal displacement of soil increases with the increase of the distance from the soil to the enclosure structure, while the change law is opposite below the critical position.

Key words: plane strain    infinitesimal element method    deflection of retaining wall    horizontal displacement    simplified calculation method
收稿日期: 2019-04-09 出版日期: 2020-05-05
CLC:  TU 375  
基金资助: 国家自然科学基金资助项目(41672264,41702313,41807262);浙江省重点研发计划资助项目(2018C03G2010707);浙江省自然科学基金资助项目(LQ20E080010)
通讯作者: 徐日庆     E-mail: chengkang@zju.edu.cn;xurq@zju.edu.cn
作者简介: 程康(1994—),男,博士生,从事土与结构相互作用研究. orcid.org/0000-0001-6518-8866. E-mail: chengkang@zju.edu.cn
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引用本文:

程康,徐日庆,林存刚,梁荣柱,单华峰,赵明. 挡墙任意变位模式诱发周围土体水平位移的简化算法[J]. 浙江大学学报(工学版), 2020, 54(5): 899-908.

Kang CHENG,Ri-qing XU,Cun-gang LIN,Rong-zhu LIANG,Hua-feng SHAN,Ming ZHAO. Simplified method for predicting surrounding soil’s horizontal displacement caused by arbitrary deflection of retaining wall. Journal of ZheJiang University (Engineering Science), 2020, 54(5): 899-908.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.05.007        http://www.zjujournals.com/eng/CN/Y2020/V54/I5/899

图 1  挡墙刚性平移变位
图 2  挡墙挠曲微段划分示意图
图 3  挡墙任意微段平移引起土体水平位移示意图
图 4  围护结构实测变形及土层分布
图 5  距围护结构距离5 m处断面上不同开挖深度下计算值与实测值的对比
图 6  距围护结构距离10 m处断面上不同开挖深度下计算值与实测对比
图 7  土层分层及土性参数
图 8  围护结构实测变形
图 9  不同开挖深度下土体水平位移实测值与计算值对比
图 10  距挡墙距离不同处的土体水平位移预测曲线
图 11  不同泊松比下的土体水平位移预测曲线
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