The earth pressure behind full-height frame integral abutments supporting granular fill
The earth pressure behind full-height frame integral abutments supporting granular fill
复制标题
全高框架整体桥台支撑颗粒填料后的土压力
DOI：
10.1139/t06-122
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
A. Bloodworth
中科院分区：
文献类型：
--
作者：
Ming Xu;C. Clayton;A. Bloodworth
与传统桥梁相比，整体式桥梁在桥面和桥台之间没有支座或接缝，因此可以显著降低桥梁寿命期间的维护要求和成本。但是，此类桥台后面的侧向土压力的最终大小存在不确定性，因为桥台被迫随着桥面长度的变化而移动，例如，有效桥梁温度的每日和每年变化。本研究主要探讨全高框架式整体式桥台在回填粒状材料后所产生的土压力。对粗砂试件和玻璃球试件进行了径向应变控制循环应力路径试验。结果表明，对于保留均匀粗砂的整体式桥台，侧向土压力在几乎所有循环应变水平下都会经历系统性增加，最终达到接近主动和被动的应力状态。侧应力的建立机制进行了探讨，它似乎是与非球形颗粒形状。讨论了框架式整体桥台设计的意义
Compared with conventional bridges, integral bridges have no bearings or joints between the deck and abutments, and thus can significantly reduce maintenance requirements and costs over the bridge life-time. However, there is uncertainty about the ultimate magnitude of the lateral earth pressure behind such abutments, as they are forced to move with the deck length change caused, for example, by daily and annual variations in the effective bridge temperature. This research investigated the earth pressure that would be expected to occur behind full-height frame integral abutments backfilled by granular materials. Radial strain-controlled cyclic stress path testing has been conducted on coarse sand specimens, and a glass ballotini specimen. The results suggest that for integral abutments retaining uniform coarse sand, the lateral earth pressure will experience systematic increases for almost all cyclic strain levels, eventually reaching states of stress close to both active and passive. The mechanism of the build-up of lateral stress is explored, and it appears to be associated with non-spherical granular particle shape. The implications for frame integral abutment design are discussed