Research on Application of Grouting Filling Technology in Goaf Surface Cracks
In order to reduce the series of geological disasters caused by surface cracks in goaf,the grouting filling method is proposed as a treatment technology.Through comparing the parameters of 9 different filling materials,the optimal grouting ratio scheme is obtained.The scheme is as follows:The mass ratio of calcium carbide mud and desulfurization gypsum is 1:1,the dosage of fly ash and cement is 80%and 4%respectively,the water cement ratio is 1,and natural curing is carried out.After verification,the compressive strength and freeze-thaw strength loss rate of the on-site test block meet the requirements after adopting this grouting scheme,and the sealing effect is good.
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