TY - JOUR
TI - Numerical study of the influence of coal seam mining under reservoir on deep oversize fault deformation
AU - Zhai Xinxian
AU - Zhai Yanwei
AU - Tu Xingzi
AU - Li Rubo
AU - Huang Guangshuai
JN - Thermal Science
PY - 2019
VL - 23
IS - 4
SP - 2315
EP - 2322
PT - Article
AB - Ground surface in Yonglong coal mine is hilly terrain. There is a Yinshigou  reservoir on minefield. Deep coal seam mining under the reservoir has an  influence on the deformation of oversize normal fault, and can cause severe  mine water-inrush. Using numerical simulation software UDEC, the paper  studied the characteristics of plastic zone and stress field in front of  coal face in the hanging wall of the fault, while the coal face advance  distances from setting-up room to coal face line were different. The results  showed that while the distance from coal face to the fault i. e. the width  of fault-protected pillar, was 80 m, the front abutment pressure had less  influence on two sides rock mass of the fault, the fault reduced the  vertical stress of its surrounding rocks; The surrounding rocks in the  vicinity of fault were in a same vertical displacement contour, whose  displacement was very smaller. Reasonable fault-protected pillar width of  the numerical study was much closer to the average water-proof coal pillar  width based on coal mines water prevention regulations of China.  Consequently, while the width of fault-protected pillar is more than 80 m,  coal seam mining in hanging wall of fault has no influence on the fault, and  coal seam safely mining under the reservoir could be carried out.