With the aim of completing excavation of a lithium ore transport tunnel in Chijiaoshan in Hunan, a TBM has broken through on the final rock face.<\/p>\n
This 7.3km tunnel through complex geology in the Nanling Mountains was dug by TBM Longyuan.<\/p>\n
As the world\u2019s first TBM purpose-built for lithium mining, Longyuan has a diameter of 6.3m and a total length of 155m, and was designed to handle hard rock and challenging geological transitions, as China Railway Engineering Equipment Group (CREG) says.<\/p>\n
A a wear-resistant cutterhead, steel arch erector, rock bolt drill, s well as asystems for floor preparation, side cutting, shotcreting, and material transport \u2013 enabling continuous, fully mechanised operations, are the options of this machine. whereas the entire route was excavated uphill at an average gradient of 5.7%.<\/p>\n
Considering that the monthly advancement record of this project in September last year was 1,186m, which CREG says set a new global benchmark for hard rock mining tunnels, the TBM significantly improved excavation efficiency and shortened the construction timeline compared to traditional drill-and-blast methods.<\/p>\n
While the planned date for completion of this tunnel was the end of August 2025, it was successfully delivered three months ahead of schedule.<\/p>\n","protected":false},"excerpt":{"rendered":"
With the aim of completing excavation of a lithium ore transport tunnel in Chijiaoshan in Hunan, a TBM has broken through on the final rock face. This 7.3km tunnel through complex geology in the Nanling Mountains was dug by TBM Longyuan. As the world\u2019s first TBM purpose-built for lithium mining, Longyuan has a diameter of 6.3m and a total length of 155m, and was designed to handle hard rock and challenging geological transitions, as China Railway Engineering Equipment Group (CREG) says. A a wear-resistant cutterhead, steel arch erector, rock bolt drill, s well as asystems for floor preparation, side cutting, […]<\/p>\n","protected":false},"author":5,"featured_media":19041,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4001],"tags":[120,3051,4848,4849,47],"class_list":["post-19040","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contract-projects","tag-china","tag-china-railway-engineering-equipment-group","tag-chinese-lithium-mine-tunnel","tag-tbm-longyuan","tag-tunneling","post--single"],"yoast_head":"\n