System and method for monitoring reserved coal pillaralong-goaf remained gateway floor crack development
A technology for reserving coal pillars and floors, which is applied in surveying, earthwork drilling, boreholes/well components, etc., can solve problems such as hidden dangers in normal construction, hole collapse in shallow floor drilling, and increased monitoring costs, so as to avoid Borehole collapse accidents occur, the overall structure design is reasonable, and the effect of improving the utilization rate of boreholes
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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, reinforcing agent, aggregate, high-efficiency water reducing agent, expansion agent, water loss reducing agent, anti-shrinkage agent, defoaming agent and retarder, and its weight ratio is 50% , 8.2%, 35.2%, 1.16%, 4.2%, 0.02%, 0.013%, 0.42%, 0.7%, the water-cement ratio is 0.143. in:
[0089] ① The inorganic base is early-strength high-strength Portland cement, the model is 42.5R Portland cement;
[0090] ②The reinforcing agent is superfine fly ash, the specification is 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 ac...
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