铁道建筑
鐵道建築
철도건축
RAILWAY ENGINEERING
2015年
1期
39-42
,共4页
董亮%牛斌%谷牧%李东昇
董亮%牛斌%穀牧%李東昇
동량%우빈%곡목%리동승
高速铁路桥梁%大面积堆载%墩顶变形%侧向变形
高速鐵路橋樑%大麵積堆載%墩頂變形%側嚮變形
고속철로교량%대면적퇴재%돈정변형%측향변형
High speed railway bridge%Large-area surcharge load%Pier top deformation%Lateral deformation
基于某高速铁路桥梁实际地质条件和现场堆载情况,运用 ABAQUS 有限元软件建立高速铁路桥梁墩台、基础及地基土相互作用有限元模型,分别假设地基土为弹性(大变形)和理想弹塑性,分析了桥梁墩台在大面积单侧堆载作用下的受力变形特性,包括墩顶中心变形、地基与桩基侧向变形沿深度变化、地基与桩基侧向应力沿深度变化等。研究结果表明:单侧大面积堆载是桥梁桩基产生水平位移的主要原因;地基黏土层取为理想弹塑性时计算的墩顶变形与地基土侧向应力明显大于取为弹性时计算值,且与现场实测值较为接近,说明地基土体发生了一定的塑性变形造成了桩基倾斜。计算结果为桥梁墩台倾斜的成因及处置措施提供了理论依据。
基于某高速鐵路橋樑實際地質條件和現場堆載情況,運用 ABAQUS 有限元軟件建立高速鐵路橋樑墩檯、基礎及地基土相互作用有限元模型,分彆假設地基土為彈性(大變形)和理想彈塑性,分析瞭橋樑墩檯在大麵積單側堆載作用下的受力變形特性,包括墩頂中心變形、地基與樁基側嚮變形沿深度變化、地基與樁基側嚮應力沿深度變化等。研究結果錶明:單側大麵積堆載是橋樑樁基產生水平位移的主要原因;地基黏土層取為理想彈塑性時計算的墩頂變形與地基土側嚮應力明顯大于取為彈性時計算值,且與現場實測值較為接近,說明地基土體髮生瞭一定的塑性變形造成瞭樁基傾斜。計算結果為橋樑墩檯傾斜的成因及處置措施提供瞭理論依據。
기우모고속철로교량실제지질조건화현장퇴재정황,운용 ABAQUS 유한원연건건립고속철로교량돈태、기출급지기토상호작용유한원모형,분별가설지기토위탄성(대변형)화이상탄소성,분석료교량돈태재대면적단측퇴재작용하적수력변형특성,포괄돈정중심변형、지기여장기측향변형연심도변화、지기여장기측향응력연심도변화등。연구결과표명:단측대면적퇴재시교량장기산생수평위이적주요원인;지기점토층취위이상탄소성시계산적돈정변형여지기토측향응력명현대우취위탄성시계산치,차여현장실측치교위접근,설명지기토체발생료일정적소성변형조성료장기경사。계산결과위교량돈태경사적성인급처치조시제공료이론의거。
Based on the actual geological conditions and the case of a high adjacent surcharge loads,a three-dimensional high speed railway bridge pier-foundation-soil interaction finite element model was established with ABAQUS. Soils were assumed elastic ( large deformation) and simulated with a ideal elastic-plastic model. The deformation and stress characteristics of bridge pier subjected to adjacent surcharge loads were analyzed respectively, including the deformation of pier top,the variations of the lateral deformation and the lateral stress along the depth of pile foundation and soils,etc. Results indicated that the single adjacent surcharge loads was the main factor to cause lateral deformation of bridge pile foundation. T wo cases were studied: the clay layer of soil foundation was assumed ideal elastic-plastic or elastic. T he lateral stress at bridge pier top was significantly greater in the former case than that in the latter,and it was closer to the measured results. T his suggested that plastic deformation occurred in the soil and the pile foundation became declining. Finally,the numerical results were provided to propose the theoretical basis for the behavior and treatment measures.