DOI: 10.11799/ce201606003
Study on safety coal and rock pillar design for 11020 mining face in Zhaogu No 2 coal mine
FENG Li-min
TANG Shi-jie
CAO Xu-chu
Abstract：In order to transfer slicing mining mode to large mining height full-seam mining for 11020 working face in Zhaogu No?2 coal mine, based on the hydro geological exploration, geotechnical test, point load test and dry saturated water absorption test, the paper studies the water rich and water blocking characteristics of the overlying strata, and demonstrates the possibility of sand control safety coal ( rock) pillar in the working face. Field measurement, empirical formula, numerical simulation and other measures are taken to expect the development height of “two-zone”. The results show that the sand control safety coal ( rock) pillar and large mining height full-seam mining can be used in most area of 11020 working face. For the area with borehole water inflow over 15m3/h after dewatering, water control safety coal ( rock) pillar should be set, using the thickness of bedrock in this area to calculate the safe mining height.
Keywords：large mining heightcoal ( rock) pillar design“two-zone” heightwater blocking characteristics
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 8-11 )