Detection system and method for monitoring fracture development of coal pillar-free gob-side entry retaining floor
A detection system and a technology without coal pillars, applied in the field of mine support, can solve the problems of normal construction safety hazards, increased monitoring costs, shallow floor drilling collapse, etc., to avoid collapse hole accidents and overcome water softening Shrinkage cavity, the effect of reasonable overall structure design
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[0088] First, prepare a certain proportion of high fluidity non-shrinkage grouting material on the ground for underground use. Large fluidity non-shrinkage grouting material components include inorganic gum base, reinforcement, aggregate, high-efficiency water reducer, expansion agent, water loss reducer, anti-shrinkage agent, defoamer and retarder, and its weight ratio is 45.6% , 6.3%, 42.5%, 0.85%, 3.54%, 0.056%, 0.012%, 0.48%, 0.76%, among which:
[0089] ① The inorganic base is early-strength high-strength Portland cement, the model is 42.5R Portland cement;
[0090] ②The reinforcing agent is high-calcium fly ash with a specification of 200-300 mesh;
[0091] ③ The aggregate is quartz sand, with a particle size distribution of 0-1.25mm, of which 0-0.16mm accounts for 15%, 0.16-0.325mm accounts for 35%, 0.325-0.85mm accounts for 32%, and 0.85-1.25mm accounts for 18%;
[0092] ④The high-efficiency water reducer is a polycarboxylic acid polymer high-efficiency water reducer...
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