对承受循环荷载的 GRS 桥墩土壤动态应力分布进行评估

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yafei Jia , Chuan-Bao Xu , Jun Zhang , Jun-jie Zheng , Yewei Zheng
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引用次数: 0

摘要

由交通引起的周期性荷载会对高铁基台产生重复应力和累积变形,从而影响高铁基台的适用性。为了评估在周期性交通荷载作用下古迹遗址系统基台的应力分布,本文介绍了用砂土回填和土工格栅加固建造的缩小比例古迹遗址系统基台模型。对古迹遗址系统桥台模型施加了不同循环荷载振幅的分阶段循环荷载,以研究循环荷载振幅、桥梁上部结构荷载和钢筋垂直间距对土壤动应力分布的影响。结果表明,循环加载引起的应力重新分布导致的残余应力增加在桥墩顶部最为明显,而向下到地基层面的应力重新分布很少。增加桥梁上部结构的静荷载或循环荷载的振幅会导致土壤垂直动态应力的增加。加固垂直间距对循环荷载下的垂直动应力增量影响不大,而循环荷载的影响最大。较近的加固垂直间距可提供更强的侧向约束,从而导致墙面后的土壤动态侧向应力增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of dynamic soil stress distribution in GRS bridge abutments subjected to cyclic loading

Traffic-induced cyclic loading generates repetitive stresses and cumulative deformations on the GRS abutments, which affect the serviceability of GRS abutments. To evaluate the stress distribution of GRS abutments under cyclic traffic loading, this paper presents reduced-scale GRS abutment models constructed with sand backfill and geogrid reinforcements. The GRS abutment models were subjected to staged cyclic loading with different cyclic loading amplitudes to investigate the influences of cyclic loading amplitude, bridge superstructure load, and reinforcement vertical spacing on the dynamic soil stress distributions. The results indicate that the increase in residual stresses due to stress redistribution induced by cyclic loading is most pronounced at the top of the abutment, while there is little stress redistribution down to the foundation level. Increasing the static load of bridge superstructure or the amplitude of cyclic loading results in an increase in the incremental dynamic vertical soil stresses. Reinforcement vertical spacing does not significantly impact the incremental dynamic vertical soil stresses under cyclic loading, while the cyclic load has the most significant influence. Closer reinforcement vertical spacing could provide stronger lateral confinement, resulting in larger dynamic lateral soil stresses behind wall facing.

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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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