Present situation and control countermeasures of roof disaster of weakly cemented roadway in Xinjiang Mining Area

Abstract

Weakly cemented coal measure strata are widely distributed in Xinjiang Mining Area, roof stability control is an important problem restricting coal mine safety production. By summarizing the types, causes and development trends of mining accidents in Xinjiang in recent 11 years, taking the roof accident of 1802 transportation lane of a coal mine in Dananhu Mining Area of Hami as an example, by the method of field investigation, laboratory test and field test, the characteristics and main influencing factors of typical roof disasters of weakly consolidated roadway in Xinjiang Mining Area are analyzed, and it is determined that the double damage of tunneling disturbance and roof water is the main cause of roof disasters of weakly consolidated roadway. Based on this, the anchoring force tests of roof bolts(cables) in different seepage areas were carried out, and the attenuation law of the anchoring force of roof bolts(cables) in areas with insignificant, moderate and large seepage was obtained with the exposed time of roof. The “active + passive” combined support technology system of weakly cemented surrounding rock roadway in different influence periods of “early-middle-late” and different spatial positions of weakly cemented surrounding rock roadway in “deep-middle-shallow” was constructed, and the control countermeasures of weakly cemented surrounding rock roadway roof in different periods and regions were proposed.

Keywords

• xinjiang mining area
• weakly cemented roadway
• roof disaster
• anchoring force
• surrounding rock control