跨海铁路桥梁深水基础冲刷数值模拟  

Numerical Simulation of Deep Water Foundation Scour for Cross Sea Railway Bridge

作　　者：陈经伟[1] CHEN Jingwei(China Railway Shanghai Design Institute Group Corporation Limited,Shanghai 200070,China)

机构地区：[1]中铁上海设计院集团有限公司,上海200070

出　　处：《铁道建筑》2024年第2期129-132,共4页Railway Engineering

基　　金：中铁上海设计院集团有限公司科研计划课题(集23-07)。

摘　　要：拟建头门港铁路支线(头门港站—头门港东站)二期工程位于浙江省东部海域,跨海铁路头门港大桥所在海域潮汐现象显著,波高较大,基础冲刷明显。首先选择7个典型桥墩,分别采用经验公式(孙志林公式和韩海骞公式)、JTG C30—2015《公路工程水文勘测设计规范》公式、美国HEC-18公式及数值模拟方法计算桥墩冲刷深度,基于百年一遇水位采用Das公式计算冲刷坑范围。然后采用半经验半理论的冲淤计算公式,计算冲淤平衡后水深变化量。通过与理论公式计算的局部冲刷深度对比,验证了数值模拟方法用于桥墩局部冲刷分析的可行性。结果表明:不管桥墩承台顺桥向尺寸如何变化,孙志林公式和HEC-18公式计算的冲刷深度偏大,韩海骞公式计算值最小,因此桥梁设计时宜采用规范公式计算冲刷深度;总体上桥墩承台顺桥向尺寸越大,冲刷坑面积越大;桥梁建成后水深下降了0.3~0.7 m,一般冲刷深度在3~5 cm,故分析该桥址处局部冲刷时可不考虑一般冲刷的影响;承台顺桥向尺寸在8~11 m时,与孙志林公式计算的局部冲刷深度相比,数值模拟值和规范公式计算值更接近,可采用数值模拟方法进行桥墩局部冲刷分析。The second phase of the proposed Toumen Railway Branch Line(Toumen Port Station-Toumen Port East Station)is located in the eastern sea area of Zhejiang Province.The tidal phenomenon is significant in the sea area where the Toumen Port Bridge of the cross sea railway is located,with high wave heights and significant foundation scour.Firstly,7 typical bridge piers were selected and empirical formulas(Sun Zhilin and Han Haiqian formulas),JTG C30—2015 Hydrological Specifications for Survey and Design of Highway Engineering formulas,American HEC-18 formula,and numerical simulation methods were used to calculate the scour depth of piers.The range of the scour pit was calculated using the Das formula based on the once-in-a-century water level.Then,the change in water depth after balancing scour and sedimentation was calculated by using a semi empirical and semi theoretical formula of scour and sedimentation calculation.The feasibility of using numerical simulation methods for local scour analysis of piers was verified by comparing the depth of local scour calculated with theoretical formulas.The results show that,No matter how the size of the pier abutment along the bridge change,the scour depth calculated by Sun Zhilin’s formula and HEC-18 formula is relatively large,while the calculation value by Han Haiqian’s formula is the smallest.Therefore,it is advisable to use standardized formulas to calculate the scour depth in bridge design.Overall,the larger the size of the piers abutment along the bridge,the larger the area of the scour pit.After the completion of the bridge,the water depth decreased by 0.3~0.7 m,while the general scour depth is 3~5 cm.Therefore,when analyzing the local scour at the bridge site,the influence of general scour may not be considered.When the size of the pier abutment along the bridge is between 8~11 m,compared with the local scour depth calculated by Sun Zhilin’s formula,the numerical simulation values are closer to the values calculated by the standard formula,and numerical simulation

关 键 词：铁路桥梁 冲刷深度 理论分析 数值模拟 桥墩 承台 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]