Research and application of key technologies for shaft lining design in ultra-deep coal mine vertical shafts
FENG Guanxue
ZHOU Xiaomin
CHEN Jinming
FU Tengfei
Abstract：With the gradual depletion of shallow high-quality coal resources in central and eastern Chi-na,the shift toward deep coal mining has become a strategic imperative for ensuring national energy security.Ultra-deep vertical shafts(exceeding 1 000 m in depth),serving as critical access routes to deep coal reserves,face severe challenges including high in-situ stress,elevated water pressure,rising ground temperatures,and complex geological conditions(e.g.,swell-shrink soils,unstable rock stra-ta,grout-resistant formations,and difficult-to-freeze layers).Traditional shaft lining design theories,such as those based on the Lamé formula and codified in the code for design of coal mine shafts and chambers(GB50384-2016),exhibit significant limitations under ultra-deep conditions.These include disconnection between the shaft lining and surrounding rock,difficulties in load determination,overly broad ranges for water pressure reduction coefficients,and lack of reference for deep freezing pressure,and often resulting in excessively thick shaft linings(frequently over 2.0 m)or even uncon-structible designs.To address these critical technical bottlenecks,this paper systematically investigates and proposes a new theory of"shaft wall-surrounding rock synergistic bearing"establis-hing corresponding mechanical models and expressions for calculating shaft lining thickness.Applying this theory to the auxiliary shaft of the Cixi Mine No.1 shaft(Asia's deepest shaft at 1 341.6 m),the lining thickness beyond 1 000 m depth was optimized from 2.2 m(based on conventional calculations)to 0.8～0.9 m.At the Hulusu Mine in Western China(main shaft ϕ9.6m,auxiliary shaft ϕ10.0 m),the shaft lining thickness was reduced to 0.9 m,saving a total of 110 million CNY in investment for main shaft and auxiliary shaft.Engineering practices have validated the correctness and advancement of the new theory,providing a innovative technical pathway for deep shaft construction in coal mines and driving industry-wide technological progress.
Keywords：deep coal resource exploitationultra-deep vertical shaftshaft lining design theorysyner-gistic bearing theoryshaft lining thickness optimization
Publication Date：2026-02-28
Online Publishing Date：2026-01-31(First online date of this platform, not the publication date of the document)
Pages：7( 1-6,31 )