Seepage Grouting Mechanism for Foundations in Goaf Sites considering Diffusion Paths

Grouting treatment is the main technology to reduce or eliminate residual deformation and activation of foundations in goaf sites. Under influences overburden mining, distribution grouting foundation quite different from that conventional mechanism porous media. In this paper, considering time-dependent viscosity diffusion path slurry, permeation Bingham fluid derived based on seepage motion equation The theoretical formula modified according fracture characteristics caving zone fault superposition effect grouting. Combined with laboratory test, formulas for four working conditions ((i) only viscosity, (ii) path, (iii) combining foundation, (iv) grouting) are verified, respectively. results used compare design scheme an engineering example. research have important significance revealing designing optimal spacing between holes.