Experimental study of non-Darcy flow seepage properties of cemented broken rocks with mass loss
Abstract：After the karstic collapse pillar disturbed by mining activities and connecting with groundwater,mass loss occurs in the seepage process of sparry deposit,which can be regarded as a kind of evolutive porous media.Using the self-designed experiment system for broken rocks,a series of seepage tests for cemented broken rocks with different amounts of salt were done.The effect from salt mass,cement mass and grain size distribution on the seepage properties of cemented broken rocks were analyzed systematically.The results show that:Both the dissolution of salt particles and migration of rock particles affect the seepage properties of cemented broken rocks.The water flow rate,changing over time,increases first and then decreases and finally tends to be stable.With an increase of salt mass,the time attaining to a seepage steady state increases.The permeability of cemented broken rocks with mass loss has a magnitude of 10-15～ 10-13 m2.The permeability decreases with an increase of cement mass;with same cement mass,the permeability increases with an increase of Talbot power exponent;with an increase of salt mass,the permeability increases rapidly after a slow increase,and 40 g is the inflection point.
Keywords：karstic collapse pillarevolutive porous mediacemented broken rockmass losspermeability
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 321-327 )