Research on Mechanism and Control of Floor Heave of Mining-Influenced Roadway in Top Coal Caving Working Face

Xingping Lai, Huicong Xu, Pengfei Shan, Yanlei Kang, Zeyang Wang and Xuan Wu
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Xingping Lai: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Huicong Xu: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Pengfei Shan: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Yanlei Kang: State Grid Energy Hami Coal and Electricity Co., Ltd., Hami 839000, China
Zeyang Wang: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Xuan Wu: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2020, vol. 13, issue 2, 1-14

Abstract: The stability of the surrounding rock is the key problem regarding the normal use of coal mine roadways, and the floor heave of roadways is one of the key factors that can restrict high-yield and high-efficiency mining. Based on the 1305 auxiliary transportation roadway geological conditions in the Dananhu No. 1 Coal Mine, Xinjiang, the mechanism of roadway floor heave was studied by field geological investigation, theoretical analysis, and numerical simulation. We think that the surrounding rock of the roadway presents asymmetrical shrinkage under the original support condition, and it is the extrusion flow type floor heave. The bottom without support and influence of mining are the important causes of floor heave. Therefore, the optimal support scheme is proposed and verified. The results show that the maximum damage depth of the roadway floor is 3.2 m, and the damage depth of the floor of roadway ribs is 3.05 m. The floor heave was decreased from 735 mm to 268 mm, and the force of the rib bolts was reduced from 309 kN to 90 kN after using the optimization supporting scheme. This scheme effectively alleviated the “squeeze” effect of the two ribs on the soft rock floor, and the surrounding rock system achieves long-term stability after optimized support. This provides scientific guidance for field safe mining.

Keywords: soft roof-coal-floor coal seam; floor heave mechanism; depth of floor failure; numerical calculation; support optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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