京沪高铁论文：京沪高速铁路阳澄湖特大桥施工对流场影响研究

1、京沪高铁论文：京沪高速铁路阳澄湖特大桥施工对流场影响研究【中文摘要】阳澄湖是太湖平原上的第三大淡水湖,是江苏省重要的淡水湖泊之一,也是苏州市重要的饮用水源之一,担负着苏州市区、昆山市以及沿湖乡镇近百万人的饮用水的供给任务。京沪高速铁路是新中国成立以来一次建设里程最长、投资最大、标准最高的高速铁路。全线纵贯北京、天津、上海三大直辖市和河北、山东、安徽、江苏四省。它的建成将使北京和上海之间的往来时间缩短到5小时以内。其中在苏州段共有七处跨越阳澄湖,分段合计线路总长5900m,共有181个墩位位于阳澄湖水中。京沪高速铁路阳澄湖特大桥在DK1226DK1263区间通过了阳澄湖水源保护区。此次京沪高铁跨

2、越阳澄湖段施工主要考虑两种施工方案,即：双排筑坝围堰施工方案和钢栈桥施工方案。修建过程中对原有的湖区流场可能产生一定的影响。因此,有必要针对京沪高高速铁路阳澄湖大桥施工可能对流场产生的影响,展开相关研究,掌握围堰施工对阳澄湖流场的影响规律,从而指导施工。本文采用Delft-3D软件对京沪高速铁路阳澄湖特大桥施工过程中的流场进行模拟,模拟主要针对四个阶段,施工前原始二维流场模拟、围堰期间二维流场模拟、栈桥期间二维流场模拟和桥墩建成后二维流场模拟。对比分析了围堰施工前后流场变化、栈桥施工前后流场变化。对比了围堰施工与栈桥施工对流场影响大小。通过对结果的分析确定对流场影响较小的施工方式。从模拟结果可

3、以看出,围堰施工与栈桥施工对湖区原有整体流向并没有改变。围堰与栈桥施工对各出入口和西南片区的流速影响不大。围堰施工与栈桥施工降低了湖中狭窄咽喉处、施工附近和太平湾里饮用水源保护区的流速。主要是施工对水流产生阻隔作用,从而降低了流速。在局部地区,围堰施工降低原有流速的量较栈桥施工期降低原有流速的量大。主要是因为围堰施工是将施工附近的水域进行了整体阻隔,而栈桥施工只是位于水中的桥墩对水流产生小部分的阻隔,阻隔面积围堰施工相对较大,从而降低湖区流速的面积也相对较大。总体来说,围堰施工和栈桥施工都会对湖区流场产生一定的影响。栈桥施工对流场产生的影响相对较小。栈桥及围堰施工对流场的影响都是暂时的,会随着

4、施工的结束而结束。【英文摘要】Yang-cheng Lake is the the third largest freshwater lake on the Taihu Lake plains, which is one of the important fresh water lakes in Jiangsu province and one of the important reference sources in Suzhou. It charges with the lakes drinking water supply tasks of the Suzhou City, Kunsha

5、n City and nearly one million people in towns along the lake. The Beijing-Shanghai high-speed railway is the longest mileage-building, the largest investment and highest standards of high-speed railway since the founding of china. It pass through Beijing, Tianjin, Shanghai, and Hebei, Shandong, Anhu

6、i, Jiangsu province. It will reduce 5 hours from Beijing to Shanghai when operating. There are seven sections passing across the Yang-cheng Lake. The total length is 5900m.There are 181 pier-bits in the lake. The DK1226DK1263 section pass through Yang-cheng Lake water source protection zones. Two co

7、nstruction plans, which are double cofferdam dam construction plan and steel bridge construction plan, are considered. The construction will have influence on the original lake flow. It is necessary to investigate the flow in order to obtain the law of influence, for direct construction.The flow is

8、simulated during construction by Delft-3D software. The simulation is focused on four stages, which are the original two-dimensional flow simulation before construction, the two-dimensional flow simulation during cofferdam construction, the two-dimensional flow simulation during steel trestle and th

9、e two-dimensional flow simulation during bridge pier. The comparison of the two-dimensional flow of the original flow and the flow during cofferdam construction, the two-dimensional flow of the original flow and the flow during bridge pier, the two-dimensional flow of the flow during cofferdam const

10、ruction and flow during bridge pier construction are made. Then, the construction method is decided based on the analysis results.From the simulation we can see that the direction of flow of the whole lake is not changed by cofferdam construction and bridge construction. cofferdam construction and b

11、ridge construction have little influence on the velocity of flow of the entrance and southwest area. cofferdam construction and bridge construction reduce the the velocity of flow of the narrow throat of lake,the vicinity fo the construction and Pacific Wanli drinking water source protection area. I

12、t is mainly because the construction produce water barrier,reducing velocity.In some areas,The reduced amount of velocity during cofferdam construction is more than which during bridge construction.It is mainly because the cofferdam construction produce the overall barrier near by the construction.A

13、s to bridge construction,it is just piers in water producding a little barrier.The barrier area of cofferdam construction is bigger,so the area of flow reduction of the lake is bigger. Overall, cofferdam construction and bridge construction will have certain influence on flow.The influence produced

14、by bridge construction is less.The influence during cofferdam construction and bridge construction is temporary,which will end after construction.【关键词】京沪高铁 阳澄湖 流场模拟 Delft-3D【英文关键词】Beijing-Shanghai high-speed rail Yang-cheng lake flow simulation Delft-3D【目录】京沪高速铁路阳澄湖特大桥施工对流场影响研究摘要6-7Abstract7第1章 前言10

15、-151.1 研究意义10-111.2 国内外研究现状11-131.2.1 湖泊水动力学数值模拟研究现状11-121.2.2 区域研究现状12-131.3 研究内容及技术路线13-151.3.1 研究内容131.3.2 技术路线13-15第2章 工程概况15-292.1 阳澄湖概况15-202.1.1 自然社会环境概况15-162.1.2 阳澄湖水环境保护概况16-182.1.3 阳澄湖湖水污染概况18-202.2 京沪高铁阳澄湖段工程概况20-292.2.1 京沪高铁概况20-212.2.2 京沪高铁阳澄湖段施工方案21-242.2.3 京沪高铁跨越阳澄湖水源保护区概况24-252.2.4 施工环水保方案25-29第3章 数值模拟软件29-403.1 DELFT-3D软件介绍29-343.1.1 Delft-3D软件功能293.1.2 Delft-3D软件结构29-333.1.3 Delft-3D应用情况33-343.2 DELFT-3D FLOW模块数学原理34-403.2.1 控制方程34-373.2.2 定解条件37-383.2.3 差分计算方法38-393.2.4 稳定性条件39-40第4章 流场模拟40-594.1 模型计算区域