Study on evolution law of overburden fracture in fully-mechanized top-coal caving face with large mining height in thick coal seam

被引：0

作者：

Liu H. ^{[1
]}

Luo Z. ^{[1
]}

Han Z. ^{[1
]}

Chen X. ^{[1
]}

Peng J. ^{[1
]}

机构：

[1] School of Energy and Mining, China University of Mining and Technology-Beijing, Beijing

来源：

Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2024年 / 52卷 / 03期

关键词：

fully-mechanized top-coal caving with large mining height; overburden fracture morphology; overburden migration; overburden sports ground; similar simulation;

D O I：

10.13199/j.cnki.cst.2022-1926

中图分类号：

学科分类号：

摘要：

Fully mechanized top-coal caving mining with large mining height is easy to form strong strata behavior, and the fracture evolution law of overlying strata is very important for safe production of working face. Taking the 160206 working face of Yangchangwan Coal Mine as the engineering background, the comprehensive research methods of similar simulation test, numerical simulation and theoretical analysis are used to systematically study the overburden fracture process and overburden migration law of the fully mechanized top coal caving working face with large mining height. The research shows that the strata in the water flowing fracture zone show “bench sinking” with the advance of the working face, and the subsidence trend of the same strata along the strike shows “sharp decline - stability (maximum) - rapid rise - stability (minimum)”. The overburden movement field of the working face has evolved from two areas (accelerated subsidence area and slow subsidence area) to three areas (accelerated subsidence area, slow subsidence area and stable area). The evolution of abscission layer and the law of surface subsidence are quantitatively described, and the dynamic subsidence mechanism of the surface and its related factors are deeply analyzed by using theoretical calculation expressions. Combined with the experimental results of similar simulation and numerical simulation, the morphological change characteristics of overburden fracture evolution are proposed: the overburden fracture morphology evolves from “single isosceles trapezoid” to “double isosceles trapezoid”, and the influence area of topsoil layer evolves from “rectangle” to “inverted trapezoid”. The dynamic evolution process of collapse area, separation area, compaction area and fracture enrichment area in overburden is analyzed: The caving zone gradually increases to a certain extent, the height decreases slightly and tends to be stable, the separation zone gradually develops from bottom to top and moves forward with the working face, the separation zone gradually closes to form a compaction zone, and the compaction zone gradually increases and finally remains stable, and the fracture enrichment zone is located at the front and back ends of goaf and moves forward with the working face. © 2024 China Coal Society. All rights reserved.

引用

页码：1 / 12

页数：11

共 25 条

[1] WANG Z L, ZHI Y B, ZHANG D H, Et al., China’s coal resources endowments with the pattern of international reserves[J], China Population,Resources and Environment, 20, S1, (2010)
[2] LI X, CUI T., Supportability analysis of sustainable development for coal resources in China[J], China Coal, 45, 1, (2019)
[3] WANG Z Q, WU C, LUO J Q, Et al., Instability mechanism and control of section coal pillar in fully mechanized mining face with super thick roof and extra thick seam[J], Journal of China Coal Society, 46, 12, pp. 3756-3770, (2021)
[4] YU Bin, KUANG Tiejun, YANG Jingxuan, Et al., Analysis of overburden structure and evolution characteristics of hard roof mining in extremely thick coal seam[J], Coal Science and Technology, 51, 1, (2023)
[5] WANG G F, PANG Y H., Full-mechanized coal mining and caving mining method evaluation and key technology for thick coal seam[J], Journal of China Coal Society, 43, 1, (2018)
[6] YU B., Study on strong pressure behavior mechanism and roof control of fully mechanized top coal caving in extra thickness seam in Datong Coal Mine [D], pp. 60-82, (2014)
[7] XUE J S, ZHAO T L, PAN L M., Research on characteristics of underground pressure behavior of extra-thick coal seams in “high-low” thick and hard rock layers in fully mechanized caving working face[J], Coal Technology, 4, 7, (2021)
[8] LIU Y X, GAO M S, HE Y L, Et al., Study of control technology about gob-side entry driving with top-coal caving in inclined extra-thick coal seam[J], Journal of China University of Mining and Technology, 50, 6, (2021)
[9] KONG L H., Overlying strata movement law and its strata pressure mechanism in fully mechanized top-coal caving workface with large space[J], Journal of Mining and Safety Engineering, 37, 5, (2020)
[10] DOU G D, LIN J C, DU X, Et al., Study on mining pressure behavior of fully mechanized top-coal caving face in extra-thick coal seam[J], Coal Engineering, 51, 8, (2019)

← 1 2 3 →