Feasibility of Coupling PS System with Building Protection in an Ultrasoft Strata Colliery

To guarantee the stability of a building complex above planned mining district with ultrasoft strata, strip technology (SMT) was applied to control displacement and deformation caused by underground exploitation. This study attempts design reasonable pillar width establish stable pillar-support (PS) system composed ground buildings coal pillars underneath. Based on stratigraphic structure strata in situ measurement data subsidence monitoring, this takes an colliery western Henan province, central China, as example examine technical economical feasibility proposed PSsyst under two scenarios. The major results indicated that initial would be 120 m scenario 1, expected damage only 450 mm maximum predicted probability integration method (PIM); while 2, cost compensation for buildings’ mining-induced increase CNY 61.31 million output 7.629 tons raw coal. Moreover, protection rate residential area postmining 1 can reach much 6.91% comparing fully mechanized winning 2. Overall, will bring good benefits both economically environmentally should worth promoting reference similar geological conditions future.