Mining-induced mechanical response of coal and rock at different depths: a case study in the Pingdingshan Mining Area
- PDF / 1,368,842 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 111 Downloads / 202 Views
ORIGINAL PAPER
Mining-induced mechanical response of coal and rock at different depths: a case study in the Pingdingshan Mining Area Ersheng Zha 1,2 & Shiyong Wu 3 & Zetian Zhang 1,2 & Ru Zhang 1,2 & Man Wang 4 & Jifang Zhou 3 & Zhaopeng Zhang 2 & Zheqiang Jia 1 Received: 7 November 2019 / Accepted: 2 September 2020 # Saudi Society for Geosciences 2020
Abstract To explore the mining-induced mechanical response of coal at different depths, laboratory testing results and field initial geostress data are combined with the geological conditions to study the differences in mining-induced stress and deformation characteristics of the coal and rock at five different depths (300, 600, 700, 850, and 1050 m) by using FLAC3D software. The results show that with increasing mining depth, the abutment pressure increases, and the abutment pressure along the excavation direction at 1050 m is 7 times that at 300 m. With increasing mining depth, the deformation of the roof abscission layer gradually increases, and the deformation along the excavation direction at 1050 m is 4.6 times that at 300 m. The numerical simulation results are consistent with the field monitoring results, meaning that the results are reliable. By further forecasting the mining-induced stress and deformation characteristics of coal and rock deeper than 1000 m (namely, at 1200, 1500, and 1800 m), it is concluded that the abutment pressures at 1200, 1500, and 1800 m are 9, 11, and 14 times that at 300 m, and the roof abscission layer displacements at 1200, 1500, and 1800 m are 6, 8, and 10 times that at 300 m, which coincides with the large deformation trend observed in deep roadways. These results have a certain guiding significance for deep energy exploration and deep coal exploitation. Keywords Coal and rock . Different depths . Mining-induced mechanical response . In situ stress
Introduction Worldwide, coal is still in common use, especially in China. In 2018, China’s Ministry of Land and Resources released the latest China Mineral Resources Report, showing that coal accounted for 60.4% of the energy consumption structure in 2017, and coal still dominates China’s energy consumption Responsible Editor: Murat Karakus * Zetian Zhang [email protected] 1
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
2
MOE Key Laboratory of Deep Underground Science and Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
3
Yalong River Hydropower Development Company, LTD, Chengdu 610051, China
4
State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Group, Pingdingshan 467000, China
structure (Ministry of Natural Resources, PRC 2018). However, because shallow coal resources are gradually being depleted, exploitation of deep coal resources will become inevitable. An underground coal seam in a rock mass is in an initial stress state before mining. During the mining process, the surrounding rock is deformed on a large scale,
Data Loading...
