Author:
Gao Yubing,Gai Qiukai,Zhang Xingxing,Xi Xun,He Manchao
Abstract
AbstractAutomatic roadway formation by roof cutting is a sustainable nonpillar mining method that has the potential to increase coal recovery, reduce roadway excavation and improve mining safety. In this method, roof cutting is the key process for stress relief, which significantly affects the stability of the formed roadway. This paper presents a directionally single cracking (DSC) technique for roof cutting with considerations of rock properties. The mechanism of the DSC technique was investigated by explicit finite element analyses. The DSC technique and roof cutting parameters were evaluated by discrete element simulation and field experiment. On this basis, the optimized DSC technique was tested in the field. The results indicate that the DSC technique could effectively control the blast-induced stress distribution and crack propagation in the roof rock, thus, achieve directionally single cracking on the roadway roof. The DSC technique for roof cutting with optimized parameters could effectively reduce the deformation and improve the stability of the formed roadway. Field engineering application verified the feasibility and effectiveness of the evaluated DSC technique for roof cutting.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Young Elite Scientists Sponsorship Program by CAST
Publisher
Springer Science and Business Media LLC
Subject
Energy Engineering and Power Technology,Geotechnical Engineering and Engineering Geology
Reference48 articles.
1. Chen M, Ye Z, Wei D, Lu W, Yan P (2021) The movement process and length optimization of deep-hole blasting stemming structure. Int J Rock Mech Min Sci 146:104836
2. Elmarakbi AM, Hu N, Fukunaga H (2009) Finite element simulation of delamination growth in composite materials using LS-DYNA. Compos Sci Technol 69:2383–2391. https://doi.org/10.1016/j.compscitech.2009.01.036
3. Gao Y et al (2017) Steady analysis of gob-side roadway retaining formed by roof fracturing and control techniques by optimizing mine pressure. J China Coal Soc 42:1672–1681. https://doi.org/10.13225/j.cnki.jccs.2016.1350
4. Gao Y, He M, Yang J, Ma X (2018) Experimental study of caving and distribution laws of gangues influenced by roof fracturing in pillarless mining with gob-side roadway retaining. J China Univ Min Technol 47:21–31
5. Gao Y, Wang Y, Yang J, Zhang X, He M (2019) Meso- and macroeffects of roof split blasting on the stability of gateroad surroundings in an innovative nonpillar mining method. Tunn Undergr Space Technol 90:99–118
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献