Superhigh seam gob-side entry driving tension succession quantitative solution method

Abstract

The invention relates to a superhigh seam gob-side entry driving tension succession quantitative solution method. The method comprises the steps of (1) determining the gob-side entry driving excavation time T1 with the basic roof sinking amount as the index; (2) determining the reasonable excavation time T2 with the roadway surrounding rock stress variation as the time index; and (3) determining the reasonable gob-side entry driving excavation time T. Through the superhigh seam gob-side entry driving tension succession quantitative solution method, the basic roof sinking amount and the overlying strata movement stabilization time are obtained on the basis of taking full consideration of the difference of coal and rocks and are more in line with the on-site actuality, and the result is moreaccurate; the roadway surrounding rock stress variation is introduced as the additional index, and a double-index system of the gob-side entry driving excavation time is formed; 70% of the maximum basic roof sinking value and 80% of maximum stress serve as the evaluation indexes of the roadway excavation time; the weight ratios occupied by the maximum basic roof sinking value and the maximum stress are determined according to specific geological conditions, and the gob-side entry driving excavation time is obtained; and the safety and stability of gob-side entry driving surrounding rocks canbe ensured, the superhigh seam gob-side entry driving time can be effectively reduced, and normal excavation succession is guaranteed.

Description

technical field [0001] The invention relates to the field of tunneling and support in coal mine roadways, in particular to a quantitative solution to tension replacement of gob-side tunneling in extra-thick coal seams. Background technique [0002] Narrow coal pillar roading along the goaf refers to the preservation of coal pillars by leaving 3-5m narrow coal pillars at the edge of the goaf under the condition that the movement of the overlying strata in the adjacent goaf terminates and the stress redistribution caused by it tends to be stable. down the laneway. At present, gob-side entry with narrow coal pillars is mainly used in thin coal seams and medium-thick coal seams. Thin coal seams refer to coal seams with a single layer thickness less than 1.3m, and medium-thick coal seams refer to those with a single layer thickness greater than 1.3m and less than 3.5m. coal seam. In the process of mining thick and extra-thick coal seams, narrow coal pillars are rarely used alon...

AI Technical Summary

Problems solved by technology

[0004] Through a large number of literature searches, it is found that there are no theoretical research and practical reports on the excavation time of gob-side roadways in extra-thick coal seams

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