In order to study the grouting reinforcement technology of high permeability inorganic materials in soft surrounding rock road-ways,the performance of grouting materials was analyzed through ground and on-site experiments in the return air roadway of the No.15124 working face of Xinjing Coal Mine.The results showed that,high permeability inorganic materials are composed of ultrafine ce-ment,micro silica powder,fly ash,and water reducing agent,and were used in a ratio of0.73∶0.14∶0.12∶0.01.The initial setting time of the material was about 3 hours,and the final setting time was about 24 hours.The network consolidation formed during grouting can a-chieve a final compressive strength of 35 MPa.The material particles were mainly block and sheet shaped,with fewer internal pores and cracks,high density,and were not easy to react with water on a large area.After using this material for grouting reinforcement in the roadway,the macroscopic cracks in the deep part of the roadway were sealed and the separation layer was filled.The cumulative deform-ation of the roof and floor of the roadway surface decreased by 71.95％,and the cumulative deformation of the two sides decreased by 74.6％.After using high permeability inorganic materials for reinforcement,the deformation effect of the surrounding rock of the road-way has been significantly controlled.
维普
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