| 既有线条件下路基桩板墙帮宽结构数值研究 |
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| 引用本文： | 石志龙.既有线条件下路基桩板墙帮宽结构数值研究[J].路基工程,2019,0(2):82-86. |
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| 作者姓名： | 石志龙 |
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| 作者单位： | 中铁二院重庆勘察设计研究院有限责任公司,重庆,400023 |
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| 摘 要： | 以某既有线条件下路基桩板墙帮宽结构为研究对象，运用Midas GTS有限元分析软件，研究了新建及既有桩板墙的受力特性。结果表明:锚索施加预应力对边坡土体沉降的影响很小，路基填土及列车荷载是边坡土体沉降的主要影响因素；新建桩和既有桩均呈现出受压状态，新建桩受到的压力要大于既有桩；桩身剪力变化较为复杂，呈现出正负交替变化；桩身最大弯矩出现在距离桩顶6~13m范围内，既有桩在桩身7m处达到最大负弯矩；锚索整体表现出受拉状态，#11、#12锚索在自由端与固定端交接的地方
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| 关 键 词： | 既有线铁路路基 桩板墙 锚索 受力特性 数值计算 |
| 收稿时间： | 2019-11-10 |
Numerical Study on Widening Structure of Subgrade Sheet-pile Wall on Condition of Existing Line |
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| Abstract: | Taking the widening structure of subgrade sheet-pile wall on condition of a existing line as the object, the mechanical characteristics of newly-built and existing sheet-pile wall were studied with the finite element analysis software Midas GTS. The result shows that, prestressed anchor cable has minor effect on settlement of slope body, and subgrade filling and train load are the main factors causing the settlement; both the newly-built and the existing piles are in the state of compression, and the pressure on the newly-built piles is larger than that on the existing piles; the shear stress of piles is subject to complicated variation, presenting alternatively positive and negative change; the maximum bending moment of pile body arises within the area 6~13 m away from the pile top, and the existing pile has the maximum negative moment at the position 7 m on the pile body; the anchor cable is in tension, and the cable #11 and #12 is subject to sudden change at the junction of free and fixed ends, and the tensile force at the fixed end increases with the prestress applied, the axial force at the end is subject to rebound which is more obvious as the prestress increases. |
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