{"id":150305,"date":"2025-04-11T13:04:39","date_gmt":"2025-04-11T12:04:39","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=150305"},"modified":"2025-04-11T13:04:39","modified_gmt":"2025-04-11T12:04:39","slug":"first-hs2-anti-sonic-boom-tunnel-completed","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/projects\/first-hs2-anti-sonic-boom-tunnel-completed\/150305\/","title":{"rendered":"First HS2 anti-sonic boom tunnel completed"},"content":{"rendered":"<h2>Two extensions have been added to the southern portal of HS2\u2019s longest tunnel to prevent sonic booms being created by the high-speed trains<\/h2>\n<p>The HS2 anti-sonic boom tunnel is <a href=\"https:\/\/www.hs2.org.uk\/about-us\/\" target=\"_blank\" rel=\"noopener\">HS2\u2019s longest tunnel, the Chiltern Tunnel.<\/a><\/p>\n<p>Two extensions have been added to the entrance to prevent the possibility of a boom.<\/p>\n<h3>All high-speed trains can create a sonic boom<\/h3>\n<p>When trains enter a tunnel, they force air forward. The air will have nowhere to escape, and so all the air will be forced to the other end of the tunnel. This air is released all at once, resulting in what are called micro pressure waves.<\/p>\n<p>While this is not usually an issue for railways as they are inaudible, high-speed railways often have trains entering tunnels at over 140mph, resulting in sonic booms.<\/p>\n<p>The Chiltern Tunnel will see trains entering at 200mph, increasing the risk of sonic booms substantially. Therefore, despite eight tunnels on <a href=\"https:\/\/www.pbctoday.co.uk\/news\/projects\/hs2-progress-update-shows-significant-progress-for-project\/147155\/\" target=\"_blank\" rel=\"noopener\">HS2 having trains entering at 140mph+,<\/a> the design of the extensions of the Chiltern Tunnel are unique due to their length and aesthetic, and are the first to be completed.<\/p>\n<p>The extensions protrude up to 220 metres, with ventilation portholes along one side. This allows some air to escape before entering the tunnel, and lowering the pressure and the resulting micro pressure wave being inaudible at the other end.<\/p>\n<h3>\u201cDesigned ground up as an entirely new and complete rail system\u201d<\/h3>\n<p>HS2 Ltd chief engineer, Mark Howard, said: \u201cThe maximum speed of HS2 varies along the route. But where the train is entering a tunnel travelling above 140mph we are building portal extensions to prevent \u2018sonic boom\u2019 occurring. \u00a0Although there are several tunnels on the line where train speed will be higher than in the Chiltern Tunnel, no other combines speeds of 200mph with length of 10 miles. \u00a0Its these unique physical characteristics that demand unique structures at each end.<\/p>\n<p>\u201cHS2 was designed from the ground up as an entirely new and complete rail system. This enabled us to develop all its constituent parts e.g. trains, tunnels, stations, power systems to complement each other and operate as intended.<\/p>\n<p>\u201cIn the case of avoiding sonic boom at tunnel portals, we used already-established key criteria including train speed, tunnel diameter and length to develop tunnel portal extensions that would prevent sonic boom occurring.\u201d<\/p>\n<p>Arup fellow, Richard Sturt, said: \u201cArup is proud to have helped create a new international benchmark for the suppression of sonic booms with the HS2 tunnel portals. They are longer than any existing portals anywhere else in the world as we have prioritized seating capacity on the train, avoiding the need for a long nose section on the train like the Japanese shinkansen.\u00a0 The portals\u2019 unique tapered design combined with the precision-sized holes provide an incredibly smooth build-up of pressure as the train enters the tunnel. As a result, there won\u2019t be any audible noises from micro pressure waves, despite the extremely high train speeds.\u201d<\/p>\n<div class=\"mk-custom-module-container\">\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Extensions have been added to the Chiltern Tunnel to prevent sonic booms as the train travels over 200mph from the entrance.<\/p>\n","protected":false},"author":32,"featured_media":150306,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[172731],"tags":[473,579],"stakeholder_rel_tag":[],"contributor_rel_tag":[],"class_list":{"0":"post-150305","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-projects","8":"tag-hs2","9":"tag-infrastructure"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>First HS2 anti-sonic boom tunnel completed<\/title>\n<meta name=\"description\" content=\"Extensions have been added to the Chiltern Tunnel to prevent sonic booms as the train travels over 200mph from the entrance\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pbctoday.co.uk\/news\/projects\/first-hs2-anti-sonic-boom-tunnel-completed\/150305\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"First HS2 anti-sonic boom tunnel completed\" \/>\n<meta property=\"og:description\" content=\"Extensions have been added to the Chiltern Tunnel to prevent sonic booms as the train travels over 200mph from the entrance\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pbctoday.co.uk\/news\/projects\/first-hs2-anti-sonic-boom-tunnel-completed\/150305\/\" \/>\n<meta property=\"og:site_name\" content=\"Planning, Building &amp; 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