云桂铁路南盘江特大桥综合勘察及分析评价  

Comprehensive Survey and Analysis Evaluation of Nanpanjiang Super Major Bridge of Kunming-Nanning Railway

作　　者：宋章[1] 唐伟华[1] 王光能[1] 王振友[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2016年第4期83-88,共6页High Speed Railway Technology

基　　金：国家铁路局科技研究计划(KF2014-019);中国铁路总公司科技研究开发计划项目(2013G014-B);中铁二院工程集团有限责任公司科研项目(院计划14126005(14-17))

摘　　要：云桂铁路南盘江特大桥为主跨416 m的上承式钢管混凝土拱桥,是云桂铁路控制性重点工程之一。桥址处于高山峡谷区,边坡岩体具有风化层和卸荷带同时共存的双层地质结构,断层发育,新构造运动强烈,危岩落石、顺层等不良地质发育。根据云桂南盘江特大桥的地质环境,结合桥梁基础的受力特点,采取了地质调绘、钻探、工程物探、平硐勘探及现场平板载荷试验和室内试验等相结合的综合勘察方法,开展了边坡稳定性专题研究、重点工程场地地震安全性评价工作,查明了桥址区地层岩性、地质构造、不良地质等工程地质条件及边坡岩体结构特征、风化层及卸荷带深度、地基承载力及场地稳定性等。勘察方法适宜,成果资料准确,为特大桥的选址、桥式桥跨的确定、拱座基础设置及设计计算分析提供了详实可靠的地质资料。Nanpanjiang super major bridge, a deck-type concrete-filled steel tube arch bridge with main span of 416 m, is one of the dominant key projects in Kunming-Naning railway. The bridge is located in alpine valley, slope rock mass was provided with the coexistent characteristics of double geological formation of weathering rock mass zone and unloading fracture zone, with the characteristics of developed faults and intense neotectonic activities, and the developed harmful geological bodies, such as rock debris and bedding. Based on the geological environment and mechanical behavior of Nanpanjiang bridge of Kunmin-Nanning railway, the comprehensive survey methods, such as geological survey, drilling, engineering geophysics, excavated tunnel investigation, plate-loading test and laboratory tests were adopted, and the slope stability and the key engineering site seismic safety were researched. The engineering geological conditions such as stratigraphic-lithologic, tectonic formation and unfavorable geology, discontinuity surfaces properties of slope rock mass, depth of weathering rock mass zone and unloading fracture zone, bearing capacity of foundation and site stability were identified. Since the comprehensive survey methods were suitable for the bridge, and the survey results were accurate, the detailed and reliable geological data were provided for the super major bridge site selection, determination of bridge type and span, foundation setting of arch abutment and computation and analysis of design.

关 键 词：云桂铁路 南盘江 大跨拱桥 综合勘察方法 地基承载力 岸坡稳定性 

分 类 号：U212.22[交通运输工程—道路与铁道工程]