Next Article in Journal
Smart Management Energy Systems in Industry 4.0
Previous Article in Journal
High Performance Single-Phase Single-Stage Grid-Tied PV Current Source Inverter Using Cascaded Harmonic Compensators
Previous Article in Special Issue
Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal
Open AccessArticle

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

1
School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2
Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an 710054, China
3
State Grid Energy Hami Coal and Electricity Co., Ltd., Hami 839000, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 381; https://doi.org/10.3390/en13020381
Received: 2 December 2019 / Revised: 4 January 2020 / Accepted: 10 January 2020 / Published: 13 January 2020
(This article belongs to the Special Issue Advanced Technologies for Energy Exploitation of Coals)
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. View Full-Text
Keywords: soft roof-coal-floor coal seam; floor heave mechanism; depth of floor failure; numerical calculation; support optimization soft roof-coal-floor coal seam; floor heave mechanism; depth of floor failure; numerical calculation; support optimization
Show Figures

Figure 1

MDPI and ACS Style

Lai, X.; Xu, H.; Shan, P.; Kang, Y.; Wang, Z.; Wu, X. Research on Mechanism and Control of Floor Heave of Mining-Influenced Roadway in Top Coal Caving Working Face. Energies 2020, 13, 381.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop