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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