弃渣对秦巴山区某既有铁路桥的安全影响

Safety effect of waste dump on the existing railway bridge located in Qinling-Daba mountains

为分析河道漫滩区弃渣堆放对秦巴山区某城市跨河既有铁路桥安全性的影响,根据原水文资料、竣工图、勘测说明等材料,计算确定河道宽度被压缩、主槽流向发生变化、桥边界条件发生较大变化的既有桥现在的水文参数,校核该桥原设计水文参数,从水文、基础承载力两方面对修建护堤后的铁路桥进行安全分析,结果表明:桥梁高程满足规范要求,2处桥墩埋深不符合规范要求,存在安全隐患;桥墩基底承载力满足规范要求。

In order to analyze the safety of an existing railway bridge which spans a river in Qinling-Daba mountains and how to affecte by the waste dump in the river shoal,the current hydrologic parameters of the existing bridge affected by the narrow river,the change of flow direction and the boundary conditions are calculated and checked.The safety analysis of railway bridge after embankment construction is made from hydrology and foundation bearing capacity.The results show that,the height of the bridge meets the requirements of the code,and the buried depth of two piers does not meet the requirements of the code,which leads to potential safety hazards.The bearing capacity of pier base meets the requirements of code.