Research on Key Parameters of Gob-Side Entry Retaining Formed by Roof Cutting of Working Face under Goaf in Close Distance Coal Seams
1
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing)
2
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing)
3
School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing)
Corresponding author
Fuxin Shen
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing)
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing)
Mining Science 2022;29:19-39
KEYWORDS
Close-distance coal seamsUnder goafRoof cutting and pressure reliefRoadway formed automaticallyKey parameters
TOPICS
Application of fundamental science to miningMine engineering and construction, underground constructionMining geomechanics and geotechnics
ABSTRACT
In order to solve the application problem of gob-side entry retaining formed by roof cutting (GERRC) technology of working face under goaf in close-distance coal seams, the 9101 working face and its return air roadway of Xiashanmao Coal Mine were taken as engineering background. The key parameters of GERRC were studied by means of theoretical analysis, numerical simulation and field test. The results show that: The roof cutting height (RCH) should be not less than the height of stope caving, meanwhile, when the rock strata collapsed, broke and expanded within RCH, it should meet the support effect on basic roof. And the RCH should be less than the distance between coal seams. The roof cutting angle (RCA) should meet the mechanical conditions of rock mass failure along the structural plane, and it should meet the geometric condition of not squeezing the roadway roof during the rotation and subsidence of the stope basic roof. When the RCH was 7.5m, the RCA was 15 degrees and the blasting charge structure was 4+3+3+2, the stress distribution and roof subsidence were most optimal. Three rows of constant resistance with large deformation (CRLD) anchor cables were used to strengthen roadway roof. The unit support, hydraulic prop and π-shaped beam were carried out as temporary support in roadway. The surrounding rock of roadway tended to be stable when lagged behind 100m, and the effect of GERRC was good after the temporary support measures were withdrawn.
REFERENCES (25)
1.
Chen SY, Zhao F, Wang HJ, Yuan GX, Guo ZB, Yang J (2019) Determination of key parameters of gob-side entry retaining by cutting roof and its application to a deep mine. Rock and Soil Mechan-ics. 40(1): 332-350. 10.16285/j.rsm.2017.2194.
2.
Cheng Zhiheng, Qi Qingxin, Kong Weiyi, Zhang lang, Ji Wenbo, Liu Xiaogang (2015) Study on the reasonable layout of gob-side remained gateway of lower coal seam close to coal seam group. Journal of Mining & Safety Engineering. 32(03):453-458.
3.
Gao X., Zhang S., Zi Y., Pathan Sakib-khan (2020) Study on optimum layout of roadway in close coal seam. Arab J Geosci 13, 746. https://doi.org/10.1007/s12517....
4.
Hao DY, Wu YZ, Chen HJ, Chu XW, Li Y. (2019) Instability mechanism and prevention technology of roadway in close distance and extra thick coal seam under goaf. Journal of China Coal Society 44(9) : 2682－2690. 10.13225/j.cnki.jccs.2019.0217.
5.
He MC, Cao WF, Shan RL, Wang SL (2003) New blasting technology——bilateral cumulative tensile explosion. Chinese Journal of Rock Mechanics and Engineering 22(12): 2047-2051. CNKI:SUN:YSLX.0.2003-12-019.
6.
He MC, Ma ZM, Guo ZB, Chen SY (2018) Key parameters of the gob-side entry retaining formed by roof cutting and pressure release in deep medium-thickness coal seams. Journal of China univer-sity of mining and technology 47(3): 468-477. 10.13247/j.cnki.jcumt.000852.
7.
He MC, Zhu GL, Guo ZB (2015) Longwall mining “cutting cantilever beam theory” and 110 mining method in China——The third mining science innovation. Journal of Rock Mechanics and Ge-otechnical Engineering,7(05):483-492. https://doi.org/10.1016/j.jrmg....
8.
Hu JZ, He MC, Wang J, Ma ZM, Wang YJ, Zhang XY (2019) Key parameters of roof cutting of gob-side entry retaining in a deep inclined thick coal seam with hard roof. Energies 12: 934. https://doi.org/10.3390/en1205... .
9.
Ji HG, Xiang P, Zhang L, Han F, Yang ZJ (2011) Experimental study and detection analysis of me-chanical properties variability of rock mass in excavation disturbance. Chinese Journal of Rock Mechanics and Engineering 30(11): 2352-2359. SUN:YSLX.0.2011-11-023.
10.
Li YF, Hua XZ, Cai RC (2012) Mechanics analysis on the stability of key block in the gob-side entry retaining and engineering application. Journal of Mining & Safety Engineering 29(3): 357-364. CNKI:SUN:KSYL.0.2012-03-012.
11.
Liu HQ, Wang L, Han CL, Liu P, Zou P (2021) Study on the instability mechanism and control measures of a roadway in a mine with retained coal pillars and close coal seams. Shock and Vi-bration. 2021,1-14. https://doi.org/10.1155/2021/8....
12.
Shi LQ, Xu DJ, Qiu M, Jing X, Sun HH (2013) Improved on the formula about the depth of damaged floor in working area. Journal of China Coal Society 38 (S2):299-303. 10.13225/j.cnki.jccs.2013.s2.029.
13.
Sun XM, Liu X, Liang GF, Wang D, Jiang YL (2014) Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams. Chinese Journal of Rock Mechanics and Engineering 33(7): 1449-1456. 10.13722/j.cnki.jrme.2014.07.017.
14.
Sun XM, Wang D, Yu SB, Wang C, Zheng YL, Ren XD (2014) Research on the evolutional course of surrounding rock structure along gob side with excavation of multiple working faces in close dis-tance seam. Journal of Mining & Safety Engineering. 31(04):607-611. 10.13545/j.issn1673-3363.2014.04.018.
15.
Teng JW, Qian YH, Song PH (2016) Analysis of exploration, potential reserves and high efficient utilization of coal in China. Chinese J. Geophys. 59(12): 4633-4653. 10.6038/cjg20161224.
16.
Wang H.W., Jiang YD, Zhao YX, Wang T., Yang T, Ning TH (2015) Determination of reasonable roadway position during extraction of closed coal seam based on energy theory. Chinese Journal of Rock Mechanics and Engineering 34(305) (S2):4023-4029. 10.13722/j.cnki.jrme.2015.0862.
17.
Wang LF, Chang ZC, Yang ZB, Wang XF, Qin DD (2018) Combined support technology of roadway under mined gob of ultra-distance seams in deep mine. Journal of Mining & Safety Engineering 35(4): 686-692. 10.13545/j.cnki.jmse.2018.04.004.
18.
Wang Q, He MC, Yang J, Gao HK, Jiang B, Yu HC, 2018. Study of a no-pillar mining technique with automatically formed gob-side entry retaining for longwall mining in coal mines. Int J Rock Mech Min Sci. 110: 1–8. https://doi.org/10.1016/j.ijrm....
19.
Xiaoming Sun, Chengwei Zhao, Gan Li, Bo Zhang, Junwei Wang, Feng Cai (2020) Physical model experiment and numerical analysis on innovative gob-side entry retaining with thick and hard roofs. Arabian Journal of Geosciences (2020) 13: 1245. https://doi.org/10.1007/s12517....
20.
Xingyu Zhang, Ronald Y.S. Pak, Yubing Gao, Chenkang Liu, Cheng Zhang, Jun Yang, Manchao He (2020) Field experiment on directional roof presplitting for pressure relief of retained roadways, International Journal of Rock Mechanics and Mining Sciences,134: 104436.
22.
Yan H., Weng MY, Feng RM, Li WK (2015) Layout and support design of a coal roadway in ultra-close multiple-seams. Journal of Central South University 22(11): 4385-4395. https://doi.org/10.1007/s11771....
23.
Zhang GF, He MC, Yu XP, Huang ZG (2011) Research on the technique of no-pillar mining with gob-side entry formed by advanced roof caving in the protective seam in Baijiao coal mine. Journal of Mining & Safety Engineering 28(4):511-516. CNKI:SUN:KSYL.0.2011-04-004.
24.
Zhang XY, He MC, Yang J, Wang EY, Zhang JB, Sun Y (2020) An Innovative Non-Pillar Coal-Mining Technology with Automatically Formed Entry: A Case Study. Engineering 6(11):1315-1329. https://doi.org/10.1016/j.eng.....
25.
Zhibiao Guo, Qiong Wang, Zhaohua Li, Manchao He, Zhibo Ma, Feixiang Zhong, Jie Hu (2019) Surrounding rock control of an innovative gob-side entry retaining with energy-absorbing support-ing in deep mining. International Journal of Low-Carbon Technologies, 14(1): 23–35. https://doi.org/10.1093/ijlct/....
| eISSN: | 2353-5423 |
| ISSN: | 2300-9586 |
We process personal data collected when visiting the website. The function of obtaining information about users and their behavior is carried out by voluntarily entered information in forms and saving cookies in end devices. Data, including cookies, are used to provide services, improve the user experience and to analyze the traffic in accordance with the Privacy policy. Data are also collected and processed by Google Analytics tool (more).
You can change cookies settings in your browser. Restricted use of cookies in the browser configuration may affect some functionalities of the website.
You can change cookies settings in your browser. Restricted use of cookies in the browser configuration may affect some functionalities of the website.
