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    ZHANG Daoxin,JIANG Luzhen,GUO Jianming,AN Junhai.Design and numerical analysis of internal support for long strip deep foundation pit in sensitive environment[J].Journal of Hebei University of Science and Technology,2020,41(6):544-550
    敏感環境長條形深基坑內支撐設計及數值分析
    Design and numerical analysis of internal support for long strip deep foundation pit in sensitive environment
    Received:September 15, 2020  Revised:October 21, 2020
    DOI:10.7535/hbkd.2020yx06009
    中文關鍵詞:  地下工程  深基坑  內支撐設計  有限元分析  監測分析
    英文關鍵詞:underground engineering  deep foundation pit  internal support design  finite element analysis  monitoring analysis
    基金項目:河北省自然科學基金(E2019208150); 河北科技大學博士科研啟動基金項目(1181331)
    Author NameAffiliationE-mail
    ZHANG Daoxin School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang  
    JIANG Luzhen School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang jiangluzhen@163.com 
    GUO Jianming Hebei Jike Engineering Project Management Company Limited, Shijiazhuang  
    AN Junhai School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang  
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    中文摘要:
          為探究長條形深基坑在敏感環境下采取何種內支撐布置型式可以保證緊鄰既有建筑及基坑的安全和穩定,以某基坑工程為背景,利用MIDAS GTS NX 對基坑進行考慮土體-結構相互作用的三維上下協同分析,對比了不同支護下的周邊建筑控制指標,并且與監測報警值以及現場監測數據進行了對比。結果表明,對撐+角撐型式內支撐較其他類型更為適用;內支撐布置型式對基底隆起的變化形態有顯著影響,但對于基底隆起量的影響較;角撐型和雙圓形環梁型內支撐在使用時應增加薄弱點處的剛度。采用對撐+角撐型內支撐既能保證基坑的安全又能較好地控制緊鄰既有建筑的變形,對類似工程的設計、施工和變形控制有一定的參考價值。
    英文摘要:
          In order to explore what kind of internal support layout can ensure the safety and stability of adjacent existing buildings in the sensitive environment of long strip deep foundation pit, taking an actual project as the background, MIDAS GTS NX was used to analyze the three-dimensional interaction of soil and structure in the foundation pit, and the deformation control indexes of the surrounding buildings and foundation pit under various types of internal support were compared, which were also compared with the monitoring alarm value and field monitoring data. The results show that internal support of the opposite brace and angle brace type is more suitable than other types; the layout of the internal support has a significant effect on the change of the basement uplift, but has little effect on the amount of the uplift; it is suggested to increase the stiffness of the weak point when using the corner brace type support and the double circular ring beam type inner support. The opposite brace and angle brace type internal support can not only ensure the safety of foundation pit, but also better control the deformation of adjacent existing buildings, which has certain reference value for the design, construction and deformation control of similar projects.
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