洗矿沉渣区铁路桥梁设计  

Design of Railway Bridges in Ore Washing Sediment Areas

作　　者：康周科 KANG Zhouke(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2025年第2期97-99,117,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(2015-C54)。

摘　　要：洗矿沉渣区铁路桥梁边界条件复杂,桥梁除承受正常荷载外还需承受一些特殊荷载,这些特殊荷载需要细致甄别、合理取值。洗矿沉渣区地表层覆盖巨厚的人工沉渣,使桥墩受力不同于普通地区,为确定渣体对桥墩产生的附加力,需要判定下游拦渣坝是否有溃坝可能,进而确定溃坝后沉渣滑塌范围和渣体对桥墩的偏压荷载,其次考虑渣体后期沉降引起的桥墩附加力。桥梁边界条件确定后,需进行桥式方案比选,除考虑经济性和技术合理性因素外,还要重点考虑桥墩施工因素。考虑桥墩所处特殊环境,桥墩设计安全系数应在规范基础上留有余地,桥墩施工方案和辅助施工措施选择均应满足施工便捷、施工安全风险小的要求。The boundary conditions of railway bridges in ore washing sediment areas are complex.In addition to normal loads,the bridges also bear some special loads that require careful identification and reasonable values.The surface layer of ore washing sediment areas is covered with a thick layer of artificial sediment,which makes the load-bearing characteristics of the bridge piers different from those in conventional areas.In order to determine the additional force generated by the slag on the bridge pier,it is necessary to assess the likelihood of dam failure downstream of the sediment-retaining dam,and then determine the sliding range of the sediment after the dam failure and the compressive load of the slag on the bridge pier.Secondly,the additional force on the bridge pier caused by the later settlement of the slag should be taken into consideration.After determining the boundary conditions of the bridge,it is necessary to compare and select the bridge scheme.In addition to considering the economic and technical rationality factors,it is also important to focus on the factors of bridge pier construction.Considering the special environment in which the bridge pier is located,the safety factor of the bridge pier design should exceed the standard requirements.The selection of the bridge pier construction plan and auxiliary construction measures should meet the requirements of convenient construction and low construction safety risks.

关 键 词：洗矿沉渣区 铁路桥梁 桥墩 沉渣滑塌范围 施工安全风险 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]