Research on open-off cut supporting technology of shallow buried coal seam large section in Shaanbei mining area
Gao Jie
Liu Junsheng
Wang Li
Yin Hualong
Abstract：In response to the problem of large section open—off cut supporting for shallow buried coal seams in the northern Shaanxi min-ing area,the No.20202 high mining height fully-mechanized mining face of Sunjiacha Longhua Coal Mine was taken as the engineering background,the open-pit support technology was studied by combining the actual geological conditions,theoretical analysis,and engi-neering practice methods on-site.The results show that the main reasons for the instability and deformation of surrounding rock in the open—off cut include the concentration of stress in surrounding rock,the destruction of roof and floor due to spontaneous combustion of coal seams,and the weakening of rock mass strength by surface water.The combined support mode of bolt,anchor cable,W-shaped steel belt,and steel woven mesh is used for supporting.At the same time,the displacement of surrounding rock in roadway is monitored and measured by combining the cross layout method and roof separation meter observation method.The monitoring results show that the displacement of roof and floor is less than 50 mm,and the displacement of two sides is less than 30 mm.The combined supporting has achieved good supporting effect,providing reference for similar complex conditions of open-off cut supporting technology.
Keywords：shallow buried coal seamlarge sectionopen-off cutcombined supporting
Publication Date：2025-10-30
Online Publishing Date：2025-11-27(First online date of this platform, not the publication date of the document)
Pages：5( 162-166 )