Roof Cutting Parameters Design for Gob-Side Entry in Deep Coal Mine: A Case Study

被引:42
作者
Fan, Deyuan [1 ]
Liu, Xuesheng [1 ,2 ]
Tan, Yunliang [1 ]
Song, Shilin [1 ]
Gu, Qingheng [1 ]
Yan, Lei [3 ]
Xu, Qiang [1 ]
机构
[1] Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control, Qingdao 266590, Shandong, Peoples R China
[2] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China
[3] Xinwen Min Grp Co Ltd, Suncun Coal Mine, Tai An 271233, Shandong, Peoples R China
来源
ENERGIES | 2019年 / 12卷 / 10期
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
roof cutting; mechanical model; numerical simulation; gob-side entry; parameters determination; CEMENTED PASTE BACKFILL; DAMAGE CONSTITUTIVE MODEL; ABUTMENT PRESSURE; SUPPORT-SYSTEM; INTACT ROCK; STRATA; DISSIPATION; STABILITY; EVOLUTION; STRENGTH;
D O I
10.3390/en12102032
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Roof cutting is an effective technique for controlling the deformation and failure of the surrounding rock in deep gob-side entry. The determination of the roof cutting parameters has become a popular research subject. Initially, two mechanical models are established for the non-roof-cutting and roof-cutting of gob-side entry in deep mining conditions. On this basis, the necessity and significance of roof cutting is revealed by analysing the stress and displacement of roadside prop. The Universal Distinct Element Code numerical simulation model is established to determine the key roof-cutting parameters (cutting angle and cutting height) according to the on-site situation of No. 2415 headentry of the Suncun coal mine, China. The numerical simulation results show that with the cutting angle and height increase, the vertical stress and horizontal displacement of the coal wall first increase and then decrease, as in the case of the vertical stress and displacement of roadside prop. Therefore, the optimum roof cutting parameters are determined as a cutting angle of 70 degrees and cutting height of 8 m. Finally, a field application was performed at the No. 2415 headentry of the Suncun coal mine. In situ investigations show that after 10 m lagged the working face, the stress and displacement of roadside prop are obviously reduced with the hanging roof smoothly cut down, and they are stable at 19 MPa and 145 mm at 32 m behind the working face, respectively. This indicates that the stability of the surrounding rock was effectively controlled. This research demonstrates that the key parameters determined through a numerical simulation satisfactorily meet the production requirements and provide a reference for ensuring safe production in deep mining conditions.
引用
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页数:25
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