Floor heave mechanism and control technology of flexural and folded deep mine roadway.

In order to analyze fracture mechanism of floor heave in entry and to enhance the stability of strata under floor, thus further guarantee the normal transportation of coal mine, this paper made a research on the evolution law of stress slip-line field, ultimate load and speed, there also investigated the floor heave mechanism and countermeasures of fold-like entry in bedding stratum, which exists in Datun mining area. The results show that two main factors influence floor stress greatly, namely, width of the entry and frictional angle of strata, it also demonstrates that supporting strength and anchoring parameters can be designed scientifically with the help of deductive anti-heave mechanical model, whose controlling effects is impressively. Especially as to deep buried entry under the circumstance of bedding stratum, longtime stability can be obtained with the supporting strength more than 0.4 MPa, which is demonstrated effectively based on the two years monitoring period of Kongzhuang Mine, and floor heave less than 10 mm, either. [ABSTRACT FROM AUTHOR]