Techniques of mining under buildings in deep-lying seams
(1.China University of Mining and Technology, Beijing 100083, China2.China Institute of Mining Technology Beijing Campus, Beijing 100083, China)
Abstract: The features of the surface subsidence basin caused by mining in the deep-lying seams are associated with the width of the coal pillar between two working faces. If the pillar is wide, a waved subsidence basin will occur on the surface. If the pillar is narrow, the maximum surface subsidence value will be very great. The influence of the interval pillar to the stress distribution caused by mining in the deep-lying seam was specially studied by using a three-dimensional finite-difference FLAC3D program. The techniques mining in the deep-lying seams under buildings were presented.
Key words: mining subsidence； numerical simulation； extraction under buildings