水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2015年
3期
29-34
,共6页
填土%桩基%加筋%监测%有限元
填土%樁基%加觔%鑑測%有限元
전토%장기%가근%감측%유한원
embankment%pile foundation%reinforcement%monitoring%FEM
哈尔滨市松花江北岸滨江大道工程穿越松花江跨江大桥。为减轻路堤填筑对桥桩的影响，基于垂向二维有限元模型及现场监测，研究了土工格栅加筋、钻孔灌注桩隔离及注浆处理等综合措施的可行性，并分析了路堤填筑过程中地基土及桥桩的变形。结果表明：土体加筋、钻孔灌注桩隔离及注浆处理等综合措施可有效减轻路堤填筑对桥桩的影响；路堤填筑对桥桩的影响主要集中在桥墩桩身的上部，桩身下部影响较小；桩基础附加沉降主要由承台上部填土所致，主动区加固措施对减小桥桩的水平位移效果比较明显。研究同时表明，垂向二维有限元模型因桩基简化为板桩墙，使得地层附加应力全部由桩基承担，被动区土层变形的计算结果偏小，桩基变形计算结果偏大。
哈爾濱市鬆花江北岸濱江大道工程穿越鬆花江跨江大橋。為減輕路隄填築對橋樁的影響，基于垂嚮二維有限元模型及現場鑑測，研究瞭土工格柵加觔、鑽孔灌註樁隔離及註漿處理等綜閤措施的可行性，併分析瞭路隄填築過程中地基土及橋樁的變形。結果錶明：土體加觔、鑽孔灌註樁隔離及註漿處理等綜閤措施可有效減輕路隄填築對橋樁的影響；路隄填築對橋樁的影響主要集中在橋墩樁身的上部，樁身下部影響較小；樁基礎附加沉降主要由承檯上部填土所緻，主動區加固措施對減小橋樁的水平位移效果比較明顯。研究同時錶明，垂嚮二維有限元模型因樁基簡化為闆樁牆，使得地層附加應力全部由樁基承擔，被動區土層變形的計算結果偏小，樁基變形計算結果偏大。
합이빈시송화강북안빈강대도공정천월송화강과강대교。위감경로제전축대교장적영향，기우수향이유유한원모형급현장감측，연구료토공격책가근、찬공관주장격리급주장처리등종합조시적가행성，병분석료로제전축과정중지기토급교장적변형。결과표명：토체가근、찬공관주장격리급주장처리등종합조시가유효감경로제전축대교장적영향；로제전축대교장적영향주요집중재교돈장신적상부，장신하부영향교소；장기출부가침강주요유승태상부전토소치，주동구가고조시대감소교장적수평위이효과비교명현。연구동시표명，수향이유유한원모형인장기간화위판장장，사득지층부가응력전부유장기승담，피동구토층변형적계산결과편소，장기변형계산결과편대。
Bingjiang Avenue is built along the north bank of Songhua River and runs through the Songpu Bridge in Haerbin city ,the provincial capital of Heilongjiang .The high embankment causes additional stresses in the ground layers affecting on the adjacent piles for the bridge abutment .In this paper ,a 2D FEM model was used to analyze the deforma-tions of soil layers and the performances of bridge piles during the construction .The field monitored data of settlements and lateral displacements were reported and discussed .The synthetic implements including geogrid ,bore piles for stress isolation and compaction grouting were studied for their feasibility on controlling the influences of high embankment on the bridge piles ,as well as the deformation of the foundation and the bridge piles .The results of computations and measure-ments in situ can be summarized as follows :the synthetic implements mentioned above can alleviate the influence of em-bankment construction on the adjacent bridge piles ;high embankment mainly affects on the performance of upper part of the piles ,while the lower parts are scarcely disturbed ;the additional settlements of the bridge piles were mostly induced by the part of embankment over the pile cap ,while the stress isolation piles in active zone can be more effective to control the lateral displacements of the piles .In addition ,because the row of piles are presented as a sheet wall in the 2D FEM model ,the additional stresses fall on the foundation of the piles ,which leads to larger deformations of bridge piles and smaller deformations of soil layers in passive zone .
