铁道工程学报
鐵道工程學報
철도공정학보
JOURNAL OF THE RAILWAY ENGINEERING SOCIETY
2013年
11期
13-17
,共5页
围护结构%内力%位移%内支撑%架立时机
圍護結構%內力%位移%內支撐%架立時機
위호결구%내력%위이%내지탱%가립시궤
enclosure structure%internal force%displacement%internal bracings%erection time
研究目的：本文针对弹性地基梁全量法计算基坑围护结构内力和位移时，内支撑是预加的、计算条件与施工实际不符的不足，提出一种考虑支撑架设时机的围护结构位移和内力计算方法，以提高计算的准确性。<br> 研究结论：（1）采用弹性地基梁杆系有限元全量法计算围护结构内力和位移时，将内支撑定义为具有初始间隙的仅受压的杆单元，并将支撑架设时围护桩（或围护墙）在该道支撑处已发生的水平位移设置为初始间隙宽度，就可较好地模拟支撑架立时机，使围护结构内力和位移的计算结果更加符合工程实际；（2）弹性地基梁全量法计算基坑围护结构内力和位移时，不考虑支撑架设时机会使围护桩（或围护墙）的侧向位移和弯矩计算值偏小，这是不安全的；（3）本文的研究成果对基坑围护结构的设计和施工有指导意义。
研究目的：本文針對彈性地基樑全量法計算基坑圍護結構內力和位移時，內支撐是預加的、計算條件與施工實際不符的不足，提齣一種攷慮支撐架設時機的圍護結構位移和內力計算方法，以提高計算的準確性。<br> 研究結論：（1）採用彈性地基樑桿繫有限元全量法計算圍護結構內力和位移時，將內支撐定義為具有初始間隙的僅受壓的桿單元，併將支撐架設時圍護樁（或圍護牆）在該道支撐處已髮生的水平位移設置為初始間隙寬度，就可較好地模擬支撐架立時機，使圍護結構內力和位移的計算結果更加符閤工程實際；（2）彈性地基樑全量法計算基坑圍護結構內力和位移時，不攷慮支撐架設時機會使圍護樁（或圍護牆）的側嚮位移和彎矩計算值偏小，這是不安全的；（3）本文的研究成果對基坑圍護結構的設計和施工有指導意義。
연구목적：본문침대탄성지기량전량법계산기갱위호결구내력화위이시，내지탱시예가적、계산조건여시공실제불부적불족，제출일충고필지탱가설시궤적위호결구위이화내력계산방법，이제고계산적준학성。<br> 연구결론：（1）채용탄성지기량간계유한원전량법계산위호결구내력화위이시，장내지탱정의위구유초시간극적부수압적간단원，병장지탱가설시위호장（혹위호장）재해도지탱처이발생적수평위이설치위초시간극관도，취가교호지모의지탱가립시궤，사위호결구내력화위이적계산결과경가부합공정실제；（2）탄성지기량전량법계산기갱위호결구내력화위이시，불고필지탱가설시궤회사위호장（혹위호장）적측향위이화만구계산치편소，저시불안전적；（3）본문적연구성과대기갱위호결구적설계화시공유지도의의。
Research purposes:As using the complete analysis method for beam on elastic foundation calculate the internal force as well as the displacement of the deep foundation ditch enclosure structure,the internal bracings was applied in advanced and the calculation condition was inconsistent with the actual of the construction,a method that considered the erection time of the inner bracings was proposed in this paper in order to improve the calculation accuracy. <br> Research conclusions:(1 )As the bar -system FEM complete analysis method for beam on elastic foundation was adopted to calculate the internal force and the displacement of the foundation ditch enclosure structure,the inner bracing was defined as compression -only bar unit with initial gap,and the width of the initial gap was equal to the lateral displacement of fender piles (or enclosure wall)on the point which the inner bracings were applied at the erection time.With that the erection time of the bracings were considered in the model,which makes the internal force and displacement calculations of the enclosure structure accord the actual better.(2)Without considering the erection time of the bracings while using the complete analysis method for beam on elastic foundation,the calculated values of the lateral displacements and moments of the fender piles (or enclosure wall)were smaller,that was not safety in practice.(3)Research findings of this paper can provide reference for the design and construction of foundation ditch enclosure structure.
