无桥台斜腿刚架桥台后土沉陷及防治对策  

Investigation on Subsidence and Control Countermeasures of Backfill of Non-abutment Slant-legged Rigid Frame Bridge

作　　者：尚刚 SHANG Gang(Anyang Northwest Belt Highway Co Ltd,Anyang 455000,Chin)

机构地区：[1]安阳西北绕城高速公路有限公司,河南安阳455000

出　　处：《土木工程与管理学报》2018年第4期72-76,共5页Journal of Civil Engineering and Management

基　　金：安阳市科技计划项目(2016012A)

摘　　要：无桥台斜腿刚架桥具有显著的结构力学性能,在跨线桥中得到较为广泛的应用。调查发现,该桥型存在桥头与路基相连接处脱空、路基沉陷和台后土沉降明显等共性病害。为此,计入静水压力对土体粘聚力与内摩擦角的影响,结合土体的多相松散颗粒塑性变形特点,基于Drucker-Prager模型对土体开展蠕变分析,深入研究台后土体的变形行为,并计入土与结构的相互作用,探讨台后土沉陷对结构的影响。最后,结合工程实践,提出应对台后土沉陷的有效措施。研究成果可为该类型桥梁及相近结构如何有效控制台后填土的沉陷提供参考。Due to the remarkable advantages of the structural-mechanical properties of non-abutment slant-legged rigid frame bridge, it has been widely applied in overpass bridges. According to the survey of engineering practices, there are such common diseases as the emptying of the bridgehead and the roadbed,the subsidence of the roadbed and the obvious settlement of the earth behind abutment. For this purpose,the effect of hydrostatic pressure on the cohesion and internal friction angle of the soil is taken into account,and combined with the plastic deformation characteristics of the loose multi-phase particles of the soil, the creep analysis of the soil is performed based on the Drucker-Prager model and the deformation behavior of the backfill is further studied. The interaction between the soil and the structure are taken into account and the influence of the subsidence of the soil on the structure is discussed. Finally,combined with engineering practice, it proposes effective measures to deal with the subsidence of earth behind abutment. The research results can provide reference for how to effectively control the subsidence of the backfill of this type of bridge and similar structures.

关 键 词：无桥台斜腿刚架桥 台后填土 沉陷 相互作用 防治对策 

分 类 号：U448.232[建筑科学—桥梁与隧道工程]