Abstract
To meet the project demands of controlling the floor heaves in broken soft rocks, a new high-performance grouting material was studied. The main performance parameters of the grouting materials with different ratios, such as the setting time, the density and bleeding ratio, the viscosity, and fluidity, were investigated in the laboratory tests. The results indicated that the optimal additive ratio is 6‰. The unconfined compression strength tests and conventional triaxial compression tests were carried out on the common and reinforced mudstones, which indicate that the strengthened effect of the new grouting materials is significant. The new high-performance grouting material was applied to controlling the floor heaves of the broken soft rocks in the coal mine. The numerical simulation and filed monitoring results indicate that the new grouting material can effectively improve the strength of soft rock and control the floor heaves.
Highlights
More and more deep soft rock roadways are under construction with the increase in mining depth
Floor heave is a kind of large deformation failure, which occurs in the deep soft rock roadways, results in great money loss, and greatly affects the safety production [7, 8]
The new grouting materials used in Scheme II have better reinforcement performance, which can effectively improve the strength of soft rock and control the floor heaves
Summary
More and more deep soft rock roadways are under construction with the increase in mining depth. Roof fall, and floor heaves due to soft rock swelling occur frequently, which extremely impair the safety in coal mine production. To explore an effective approach and technique to improve the surrounding rock structure is the key problem to be solved in soft rock roadway support [4–6]. Floor heave is a kind of large deformation failure, which occurs in the deep soft rock roadways, results in great money loss, and greatly affects the safety production [7, 8]. To solve the problem of stability control in soft rock roadways, Chang et al [17] revealed the mechanism of floor heaves and designed reasonable support parameters of hydraulic expansion bolts. The results showed that the hydraulic expansion bolts can reduce the plastic zone in the floor
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