Influence of lateral structure and combined support system of split-level entries in the thick seam
- PDF / 5,217,658 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 91 Downloads / 167 Views
ORIGINAL PAPER
Influence of lateral structure and combined support system of split-level entries in the thick seam Zhi Qiang Wang 1,2 & Lei Shi 1 & Peng Wang 1 & Chao Wu 1 Received: 4 July 2019 / Accepted: 23 September 2020 / Published online: 30 September 2020 # Saudi Society for Geosciences 2020
Abstract In this paper, an innovative mining method of the split-level of external staggered gob-side entry (SEGE) is proposed to solve the serious deformation of traditional entry in the continuous panel and coal wastage in Xiegou Coal Mine. Entries on either end of a longwall panel using the layout are located at different vertical levels within a thick coal seam. In the same panel, an entry (haulage entry) is along the floor and the other entry (air-return entry) is along the roof. Theoretical formula is used to calculate the fracture position of the main roof. The system uses “trapezoidal bottom coal body below the air-return entry (TBCBHE) + fallen rock” to control the rotation angle of key block B in the main roof, and reduces the transmission of stress to gob-side entry in the continuous panel. The influence of lateral structure of the TBCBHE is used to ensure the stability of chain pillar of the gobside entry in the continuous panel. At the same time, the anchor bolt (cables)–combined support is adopted in different spatial positions of adjacent entries in the adjacent panels to reduce the surrounding rock deformation of the gob-side entry in the continuous panel. Through the on-site application monitoring, the rib-to-rib and roof-to-floor convergences of the gob-side entry were significantly reduced than the previous wide pillar entry. Keywords Influence of lateral structure . Trapezoidal bottom coal body . Combined support zone . Gob-side entry
Introduction Thick coal seam mining accounts for 45% of underground production in China (Wang 2018). The thick coal seams are widely distributed in Shanxi, Shaanxi, Xinjiang, Inner Mongolia, and other regions. A few of new technologies for coal mining are emerging in China: robotic intelligent mining, in situ fluidized mining, and zero-emission gangue filling mining (Ge et al. 2020). These technologies can not only free miners from the hard and dangerous environment and superstrength manual labor but also reduce the pollution pressure from the fossil energy development on the environment. Considering the uneven occurrence of coal seam and highResponsible Editor: Murat Karakus * Lei Shi [email protected] 1
School of Energy and Mining Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
2
Research Center of Top-Coal Caving Mining in Coal Mining Industry, Beijing 100083, China
efficiency mining, full-mechanized caving technology has been widely used in recent years. During the mining period of a panel, it is necessary to set a certain width of chain pillar to bear the load of the overlying strata and prevent the disaster caused by the roof convergence. Scholars have conducted extensive research on reasonable width of chain pillar unde
Data Loading...
