{"id":17947,"date":"2022-07-20T17:26:37","date_gmt":"2022-07-21T00:26:37","guid":{"rendered":"https:\/\/www.robbinstbm.com\/?p=17947"},"modified":"2022-07-20T17:26:37","modified_gmt":"2022-07-21T00:26:37","slug":"jefferson-barracks-tunnel","status":"publish","type":"post","link":"https:\/\/www.robbinstbm.com\/zh-hans\/jefferson-barracks-tunnel\/","title":{"rendered":"Hard Rock Tunnel Boring at the Jefferson Barracks Tunnel"},"content":{"rendered":"<p>The Metropolitan St. Louis Water District\u2019s Project Clear is a 28-year program targeting wastewater capacity throughout St. Louis, MO. The extensive program includes the Jefferson Barracks Tunnel, running parallel to the Mississippi River at 2 m ID and 5,400 m long.\u00a0 A rebuilt Robbins Main Beam TBM began boring but hit challenging conditions about 2,400 m in, including water inflows. A larger 4.1 m Robbins Main Beam machine, launched in 2022, is now completing the remaining 3,050 m in limestone, dolomite, and shale. The TBM is utilizing a high-powered, high breakout torque cutterhead along with enhanced 360-degree probing &amp; grouting capabilities to detect any karst formations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Jefferson Barracks Tunnel runs parallel to the Mississippi River for 5.4 km in limestone, dolomite and shale with potential for karst formations. Read the paper to find out about the challenging conditions encountered by a Robbins TBM, and the new Main Beam machine, launched in 2022 to complete the tunnel. <\/p>\n","protected":false},"author":2,"featured_media":17915,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[7],"tags":[],"class_list":["post-17947","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-white-papers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hard Rock Tunnel Boring at the Jefferson Barracks Tunnel - Robbins<\/title>\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.robbinstbm.com\/jefferson-barracks-tunnel\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hard Rock Tunnel Boring at the Jefferson Barracks Tunnel - Robbins\" \/>\n<meta property=\"og:description\" content=\"The Jefferson Barracks Tunnel runs parallel to the Mississippi River for 5.4 km in limestone, dolomite and shale with potential for karst formations. 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