{"id":11187,"date":"2019-07-15T12:53:28","date_gmt":"2019-07-15T19:53:28","guid":{"rendered":"https:\/\/robbinstbm.com\/?p=11187"},"modified":"2019-07-15T12:53:28","modified_gmt":"2019-07-15T19:53:28","slug":"tunneling-in-mixed-face-conditions","status":"publish","type":"post","link":"https:\/\/www.robbinstbm.com\/zh-hans\/tunneling-in-mixed-face-conditions\/","title":{"rendered":"Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation"},"content":{"rendered":"<p>EPB TBM tunneling in mixed face conditions\u2014partially in both rock and soil\u2014is inherently problematic for even the most experienced crews. Over-excavation, excessive damage to cutter tools and regular cutterhead interventions are major challenges when negotiating mixed face geology. This paper draws from real field experiences, including successful bores in abrasive rock and soil at India\u2019s Chennai and Bangalore metro projects, to determine the optimal operational parameters for TBMs in such conditions. It also addresses reduction of air losses to facilitate cutterhead interventions under hyperbaric conditions when installation of safe-haven grout blocks is not an option due to surface structures.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>EPB TBM tunneling in mixed face conditions\u2014partially in both rock and soil\u2014is inherently problematic for even the most experienced crews. Over-excavation, excessive damage to cutter tools and regular cutterhead interventions are major challenges when negotiating mixed face geology. This paper draws from real field experiences, including successful bores in abrasive rock and soil at India\u2019s Chennai and Bangalore metro projects, to determine the optimal operational parameters for TBMs in such conditions.<\/p>\n","protected":false},"author":2,"featured_media":11189,"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-11187","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 v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation - 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\/tunneling-in-mixed-face-conditions\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation - Robbins\" \/>\n<meta property=\"og:description\" content=\"EPB TBM tunneling in mixed face conditions\u2014partially in both rock and soil\u2014is inherently problematic for even the most experienced crews. Over-excavation, excessive damage to cutter tools and regular cutterhead interventions are major challenges when negotiating mixed face geology. This paper draws from real field experiences, including successful bores in abrasive rock and soil at India\u2019s Chennai and Bangalore metro projects, to determine the optimal operational parameters for TBMs in such conditions.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.robbinstbm.com\/tunneling-in-mixed-face-conditions\/\" \/>\n<meta property=\"og:site_name\" content=\"Robbins\" \/>\n<meta property=\"article:published_time\" content=\"2019-07-15T19:53:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2019\/07\/Image-4-RGB.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"3510\" \/>\n\t<meta property=\"og:image:height\" content=\"2340\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Robbins\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Robbins_Co\" \/>\n<meta name=\"twitter:site\" content=\"@Robbins_Co\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Robbins\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/tunneling-in-mixed-face-conditions\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/tunneling-in-mixed-face-conditions\\\/\"},\"author\":{\"name\":\"Robbins\",\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/#\\\/schema\\\/person\\\/5fb6775f0b2b170edca2e3bdc16be280\"},\"headline\":\"Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation\",\"datePublished\":\"2019-07-15T19:53:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/tunneling-in-mixed-face-conditions\\\/\"},\"wordCount\":114,\"publisher\":{\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/tunneling-in-mixed-face-conditions\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.robbinstbm.com\\\/wp-content\\\/uploads\\\/2019\\\/07\\\/Image-4-RGB.jpg\",\"articleSection\":[\"White Papers\"],\"inLanguage\":\"zh-CN\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.robbinstbm.com\\\/tunneling-in-mixed-face-conditions\\\/\",\"url\":\"https:\\\/\\\/www.robbinstbm.com\\\/tunneling-in-mixed-face-conditions\\\/\",\"name\":\"Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation - 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