{"id":46112,"date":"2025-05-02T17:31:59","date_gmt":"2025-05-02T12:01:59","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=46112"},"modified":"2025-05-16T17:33:14","modified_gmt":"2025-05-16T12:03:14","slug":"rishikesh-karnaprayag-tunnel-t-8","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/rishikesh-karnaprayag-tunnel-t-8\/","title":{"rendered":"Rishikesh-Karnaprayag Tunnel T-8"},"content":{"rendered":"<h2>Rishikesh-Karnaprayag Tunnel T-8 Latest News<\/h2>\n<p>Tunnel No. 8 (T-8) is set to become India\u2019s longest rail transportation tunnel at 14.57 km, surpassing the current longest T-50 (12.77 km) on the Udhampur-Srinagar-Baramulla Railway Link.<\/p>\n<h2>About Rishikesh-Karnaprayag Tunnel T-8<\/h2>\n<ul>\n<li><strong>T-8<\/strong>\u00a0is a\u00a0<strong>twin tunnel<\/strong>\u00a0situated on the\u00a0<strong>Devprayag\u2013Janasu stretch<\/strong>\u00a0of the\u00a0<strong>125-km Rishikesh\u2013Karnaprayag Broad Gauge Rail Link Project<\/strong>, in the\u00a0<strong>state of Uttarakhand<\/strong>.<\/li>\n<li>The project is being implemented by\u00a0<strong>Rail Vikas Nigam Limited (RVNL)<\/strong>, a\u00a0<strong>Navratna PSU<\/strong>\u00a0under the\u00a0<strong>Ministry of Railways<\/strong>, and\u00a0<strong>executed by Larsen &amp; Toubro (L&amp;T)<\/strong>.<\/li>\n<li><strong>Over 83% of the 125-km alignment<\/strong>\u2014about\u00a0<strong>104 km<\/strong>\u2014comprises tunnels, making it one of the most\u00a0<strong>underground-intensive rail projects in India<\/strong>.<\/li>\n<li>The rail line will connect\u00a0<strong>Rishikesh to Karnaprayag<\/strong>, cutting travel time from\u00a0<strong>7 hours to just 2 hours<\/strong>, enhancing connectivity across\u00a0<strong>five districts<\/strong>:\u00a0<strong>Dehradun, Tehri Garhwal, Pauri Garhwal, Rudraprayag, and Chamoli<\/strong>.<\/li>\n<\/ul>\n<h3>Engineering and Technological Highlights<\/h3>\n<ul>\n<li><strong>Tunnel Boring Machines (TBMs)<\/strong>\u00a0were used for the\u00a0<strong>first time in Himalayan rail projects<\/strong>\u00a0to excavate\u00a0<strong>10.4 km of T-8<\/strong>. These\u00a0<strong>2200-tonne machines<\/strong>\u00a0were imported from\u00a0<strong>Germany<\/strong>, transported via\u00a0<strong>17 shipments<\/strong>\u00a0and assembled on site.<\/li>\n<li>The\u00a0<strong>diameter of the TBM used<\/strong>\u00a0for T-8 was\u00a0<strong>9.1 metres<\/strong>, larger than the\u00a0<strong>6-metre TBMs<\/strong>\u00a0used in the\u00a0<strong>Delhi Metro<\/strong>.<\/li>\n<li><strong>The New Austrian Tunnelling Method (NATM)<\/strong>\u00a0was used to excavate the\u00a0<strong>remaining 4.11 km<\/strong>\u00a0of the tunnel, especially in non-uniform geological zones.<\/li>\n<li><strong>Three advanced technologies<\/strong>\u00a0were deployed for safety and precision:\n<ul>\n<li><strong>Tunnel Seismic Prediction (TSP)<\/strong>\u00a0to detect geological faults.<\/li>\n<li><strong>Torque Box<\/strong>\u00a0for multidirectional boring capability.<\/li>\n<li><strong>Void Measurement<\/strong>\u00a0to detect and fill gaps behind tunnel linings.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Source:\u00a0<\/strong><a href=\"https:\/\/indianexpress.com\/article\/long-reads\/himalayan-uttarakhand-india-longest-rail-tunnel-9977990\/\" target=\"_blank\" rel=\"nofollow noopener\">IE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T-8 is a twin tunnel situated on the Devprayag\u2013Janasu stretch of the 125-km Rishikesh\u2013Karnaprayag Broad Gauge Rail Link Project, in the state of Uttarakhand.<\/p>\n","protected":false},"author":11,"featured_media":46113,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[21,262,23],"class_list":{"0":"post-46112","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"tag-prelims-pointers","9":"tag-rishikesh-karnaprayag-tunnel-t8","10":"tag-upsc-prelims-current-affairs","11":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/46112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=46112"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/46112\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/46113"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=46112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=46112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=46112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}