Additional stress in soil embankments subjected to a new prestressed reinforcement device
Additional stress in soil embankments subjected to a new prestressed reinforcement device
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新型预应力加固装置对土堤附加应力的影响
DOI：
10.3846/jcem.2019.10532
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发表时间：
2019
影响因子：
4.3
通讯作者：
Ai Xi
中科院分区：
文献类型：
--
作者：
Zhang Qishu;Leng Wuming;Xu Fang;Yang Qi;Ai Xi
推导了一种新型预应力路堤（PE）中附加应力/预应力的理论解，并利用该理论解和三维有限元分析，阐明了预应力在具有宽度为0.9 m的侧压板（LPP）的PE中的扩散特性。研究结果表明：（1）理论解的应用要求桩顶与路肩净间距大于桩顶宽度;（2）最大预应力出现在LPP加载区的上部，最大和最小预应力在浅部存在一个数量级的差异，但随着深度的增加，这种差异逐渐衰减，预应力逐渐趋于均匀;（3）预应力以一定的峰值应力扩散角传播到主要承受列车荷载的核心区，在LPP的外侧区域，沿着斜坡和纵向的角度分别为50°和58°;和（4）连续的，当LPP间距小于0.5时，可在核心区上方形成有效且相对均匀的预应力保护层，预应力系数大于0.1设计得很好
Theoretical solutions were derived to calculate the additional stress/prestress in a newly-developed prestressed embankment (PE), and the diffusion characteristics of the prestress in a PE with a lateral pressure plate (LPP) having width of 0.9 m were clarified using the theoretical solutions and a 3D finite element analysis. The results show that (1) the application of the theoretical solutions requires the net spacing between the LPP and the embankment shoulder is greater than the LPP width; (2) the maximum prestress appears in the upper part of the loading area of a LPP, and the maximum and minimum prestresses present an order of magnitude difference at the shallow depth, but the difference attenuates and the prestress gradually tends to be uniform with increasing depth; (3) the prestress propagates to the core zones that mainly bear the train loads with certain peak stress diffusion angles, and the values for the analyzed case are 50° and 58° in the external regions of the LPP along the slope and longitudinal directions, respectively; and (4) a continuous, effective and relatively uniform prestressing protective layer with a prestress coefficient greater than 0.1 can be formed above the core zones when the LPP spacing is properly designed.