Study of grouting in abandoned mine goafs

Abstract：The paper analyzes subsidence quantity of the abandoned mine goaf, which comprises four parts:embedded soleplate quantity between grouting pillar and fracture rock of goaf W_c1, compression quantity between grouting pillar and fracture rock of goaf W_c2, close quantity of the upper terrane bed_seperation W_c3and increment of bearing terrane camber W_c4, and deals with its mechanics mechanism; At the same time, grouting_and_bashing is widely adopted to process abandoned mine goafs, and according to valid district theories, formula of space between grouting drills is deduced.

Keyword：abandoned mine goaf; groutingandbashing; space between drills; valid district theory;