沿江冲积平原区某铁路特大桥勘察  

Geological Investigation of A Railway Bridges over the Yangtze River Alluvial Plain

作　　者：甘森林 喻洪亮 甘建军[2] 张雷 GAN Sen-lin;YU Hong-liang;GAN Jian-jun;ZHANG Lei(Survey and Design Institute of Jiangxi Province,Nanchang330099;Nanchang Institute of Engineering,Nanchang330099;Five-Department Fifth China Railway Survey and Design Institute Co.,Ltd,Beijing102600)

机构地区：[1]江西省勘察设计研究院,南昌330099 [2]南昌工程学院,南昌330099 [3]中铁五院第五勘察设计院有限公司,北京102600

出　　处：《四川地质学报》2017年第4期655-658,共4页Acta Geologica Sichuan

基　　金：江西省教育厅科学技术研究项目(GJJ151124);国家自然科学基金(41272297)资助

摘　　要：沿江冲积平原区工程地质条件较为特殊,地层具有河流相沉积的典型特征:由上至下为洪冲积的粘土、粉土、砂土及圆砾石土,下伏沉积相的全风化、中风化的砂岩,岩土力学性质具软硬交错特点。通过勘察和综合分析,提出下卧软弱地层、液化效应是冲积平原区特大桥勘察的重点和难点,并以京九高速铁路孔垄上行特大桥勘察为例,对沿江冲积平原区铁路特大桥勘察开展工程地质分析,总结了该类型大桥勘察工程地质问题,提出了端承桩+T字梁结构+抗液化措施的建议,为设计和施工提供了科学依据。Sediments on the Yangtze River alluvial plain is fluvial deposits consisting of diluvium-alluviumsuch as clay,silt soil,sandy soil and round gravel soil and underlying weathered sandstone whose rock and soil mechanics is characterized by soft hard alternation.The investigation indicates that the underlying weak rock bed and liquefied effect are the key of the railway bridge construction.Accordingly,in combination with experiences of the Konglong bridge,a suggestion on the end bearing pile,T beam structure and liquefaction resistance measures is put forward which provides scientific basis for design and construction.

关 键 词：铁路桥 冲积平原 工程地质 勘察 

分 类 号：P642.3[天文地球—工程地质学]