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收稿日期: 2016-05-18
修回日期: 2016-08-15
网络出版日期: 2016-09-20
Numerical Simulation of Risk Nodes in Segment Floating Transportation of Honggu Tunnel in Nanchang
Received date: 2016-05-18
Revised date: 2016-08-15
Online published: 2016-09-20
红谷隧道是目前国内第一座在流速大、水位落差大的江河中部用沉管法修建的隧道，浮运施工难度大。为确保管段及邻近建筑物在浮运过程中的安全，需要对管段浮运过程中的风险节点进行分析。采用数值模拟的方法对管段浮运过程中各风险节点的管段所受水流力进行分析，计算软件采用Fluent，计算模型基于RNG κ-ε紊流模型，管段上的水流阻力可通过计算软件直接提取。根据数值模拟结果，结合浮运施工方案中设备拖航能力，对浮运施工方案提出建议，其中管段浮运出坞流速要求低于0.6 m/s，管段浮运出坞后转体流速要求低于0.8 m/s，管段浮运过南昌大桥流速要求低于1.0 m/s；而原施工方案中回旋区转体存在风险，经优化方案后，新回旋区流速能满足管段转体与系泊要求。
邓小新 , 刘惠康 , 张玉成 , 管蕾 , 黄珂 . 南昌红谷隧道管段浮运过程风险节点数值模拟及分析[J]. 隧道建设, 2016 , 36(9) : 1052 -1059 . DOI: 10.3973/j.issn.1672-741X.2016.09.005
Honggu Tunnel is the first immersed tunnel in river with large flow velocity and large water level drop.The tunnel segment floating transportation is difficult. The risk nodes in segment floating transportation of the tunnel are analyzed so as to guarantee the safety of the segment and surrounding buildings. The water resistances on segment at every risk node are numerically simulated; the calculation software Fluent is adopted; and the calculation model is based on RNG κ-ε model.Some suggestions are proposed as follows: 1) The segment undocking should be carried out under the flow velocity of less than 0.6 m/s. 2) The segment turning should be carried out under the flow velocity of less than 08 m/s. 3) The segment passing through Nanchang Bridge should be carried out under the flow velocity of less than 1.0 m/s. 4) The optimized segment turning scheme of river course widening can meet the requirements of segment turning and anchoring.
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