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789
深茂高铁江门新会段高速铁路拱形全封闭声屏障,主要是为了减少高速列车在运行过程中产生的噪音,保护著名景区“小鸟天堂”。
中国一座长2公里、投资1亿8000万元(约1亿1000万令吉)的拱形全封闭声屏障在深茂高铁江门新会段顺利完工。据悉,这是全球首例高速铁路拱形全封闭声屏障,主要是为了减少高速列车在运行过程中产生的噪音,保护著名景区“小鸟天堂”。
由于地形所限,作为广东省首条直接连接珠三角核心城市与粤西地区的高铁线——江湛铁路需要从景区而过,列车噪声会不会惊扰小鸟,成为考验建设者的难题。

在广东省江门市天马村附近,有一棵长于明末清初的水榕树。随着时间的推移,大榕树独木成林,目前已经覆盖了近2万平方米的水面。由于榕树枝叶茂密,因此成为很多鸟类的安居之所。这里栖息着三万多只鹭鸟,是作家巴金笔下《鸟的天堂》的原型。
江湛铁路距离生态区规划边缘约300米,2014年8月开始,施工方联合广州局集团公司、铁四院、华中科技大学、武汉理工大学、西南交通大学等单位联合开展技术攻关,通过车桥耦合、风洞试验、噪音检测等模拟试验,最终确定施工方案,为经过景区的两公里路段穿上特殊的“防护衣”。

与以往铁路开放性的金属声屏障不同,此次采用的是全封闭拱形声屏障,因为拱形受力更均匀,能够抵抗14级台风。
这座全长2036米的声屏障主要由拱形钢构架和金属吸、隔声板及ECC混凝土吸声板组成,将通用的140毫米厚金属吸声板减小为80毫米厚,从而保证金属板力学及声学性能满足指标要求。此外,ECC混凝土吸声板采用高韧性纤维材料,降噪效果好。
为验证降噪效果,科研团队在大榕树处进行监测实验,经过反复测试,全封闭声屏障安装后降噪20分贝以上,令该点保持原有的分贝数。
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