Research on the Strength Performance of Underground Grouting Material Reinforced by Glass Fiber in Xiyu Coal Mine
For improving the mechanical properties of waterproof grouting material,waste glass fiber was proposed to modify the material.Through uniaxial compression test,the law of the strength of the grouting body affected by fiber length,fiber content and curing time was investigated.The strengthening mechanism of waste glass fiber was discussed by combining damage analysis and microscopic images.The results show that the addition of glass fiber significantly improves the compressive strength and ductility of the grouting body.The growth rate of strength decreases with the increase of curing time,the growth rate is fast within 3 days,and tends to be stable after 3 days.The glass fiber length has a significant effect on the strength,and the short fiber has the highest contribution to the strength growth.With the increase of fiber content,the strength index increases first and then decreases,and reaches the maximum when the fiber content is 0.3％-0.4％.The bridge effect of fiber in cement mortar can inhibit the expansion of compression cracks and buffer the failure of specimens.When the length of glass fiber is too large or the content is too high,the porosity of local area will be increased,and the deformation and strength of mine water plugging and grouting will be weakened.
Glass fiberPrevention and control of mine waterGrouting materialStrength of grouting bodyMicroscopic mechanism
万方数据
维普
