Presently most of research results on strata behaviors were concluded under the normal (moderate) advance rate conditions. Comparing with normal advance rate, fast advance rate and slow advance rate may cause some n...Presently most of research results on strata behaviors were concluded under the normal (moderate) advance rate conditions. Comparing with normal advance rate, fast advance rate and slow advance rate may cause some new changes of strata behaviors. The characteristics of ground pressure behaviors in working face with great mining height at different forward speeds were studied by similarity model experiment in laboratory. Its conclusion provides a theoretic basis for ground pressure controlling.展开更多
Taken taifeng coal mine in Mongolia for example, discussed the stability and controllability about advance pillars which locate at the front of working face and makes simulation on pillar with the software UDEC3.1. Th...Taken taifeng coal mine in Mongolia for example, discussed the stability and controllability about advance pillars which locate at the front of working face and makes simulation on pillar with the software UDEC3.1. The failure styles of advance pillars are shear failure and compression failure through analyzing the stability of advance pillars. The paper concludes that can protect advance pillars from shear failure by controlling coefficient of volumetric expansion of mining field rock and supports' working resistance and can also protect it from compression failure by advance supporting, increasing setting pressure and working resistance. Two advance pillars are influenced and the main failure form is compression failure through the numerical simulation.展开更多
文摘Presently most of research results on strata behaviors were concluded under the normal (moderate) advance rate conditions. Comparing with normal advance rate, fast advance rate and slow advance rate may cause some new changes of strata behaviors. The characteristics of ground pressure behaviors in working face with great mining height at different forward speeds were studied by similarity model experiment in laboratory. Its conclusion provides a theoretic basis for ground pressure controlling.
文摘Taken taifeng coal mine in Mongolia for example, discussed the stability and controllability about advance pillars which locate at the front of working face and makes simulation on pillar with the software UDEC3.1. The failure styles of advance pillars are shear failure and compression failure through analyzing the stability of advance pillars. The paper concludes that can protect advance pillars from shear failure by controlling coefficient of volumetric expansion of mining field rock and supports' working resistance and can also protect it from compression failure by advance supporting, increasing setting pressure and working resistance. Two advance pillars are influenced and the main failure form is compression failure through the numerical simulation.