School of Civil Engineering,Hebei University of Science and Technology School of Mechanics and Engineering,Liaoning Technical University

针对国内综放开采后部刮板输送机采用端卸,导致工作面机头和机尾部放煤效果差的情况,根据东滩煤矿1306工作面的地质条件,介绍综放工作面交叉侧卸总体配套技术,提出综放工作面后部输送机采用交叉侧卸方式,实现前后部机头、机尾中心距与中间段中心距一致,介绍了研发的新型综放工作面端头、过渡支架和巷尾支架。试验表明,交叉侧卸方式可改变现有综放工作面端头区的配套模式,能完善综放工作面端头部的支护效果,提高回收率。

in order to study the expansion law of the saturated water coal racture under the infitaion of the liuid nirogen.,the cubic raw cal samples taken fromWangyingziMine,ater the vacuum saturation,the lquid ntirogen leaching experiment was conducted. The sound velocity of the coal sample was tested before and afitthe liquid nitrogen leaching and the representative crack area variation rate and coal sample surface micro structure variation were tested. Under th liquid niragen roe,the frost swelling pressure of the ice was derived from the water phase in the saturated water cracks and the mechanics crterion of the saurated warer crack expanded was established under th liquid ntrogen role.The results showed that 1 under infitration h licuid ntrogen.the crack water in the coal rnstomed toice,the woume was swelled,the cracks within the coal were expanded.,the representative crack area was inreased,th ultrasonit velocity was rediced and the crack dersty was ineased. The micro structure of the coal was highly varied. 2 The mechanics crterion estabished could accurat ely predict the crack expansion of the cal sample. withthe length ratio of long axis and minor axis decreased ,the frost swellig pressure would be inreased and with the waer fiov coerficsent inrea sed,thelnear of the frostswelling would be decreased.

国家高技术研究发展计划(863计划)资助项目(2012AA06A407)；