Research into the deformation characteristics of coal roadway with weakly cemented rock strata and large section in Yangjiacun mine

In order to analyze deformation characteristics of coal roadway with weakly cemented rock strata and large section in Yangjiacun mine，instiuation investigation，laboratory experiments，and institution monitoring were adopted to research the physical-mechanical characteristics of surrounding rock and evolutionary traits of displacement curves.The results show that the softening coefficient is approximate to 0.23，and the rock is belong to softening rock；the physical-mechanical characteristics of surrounding rock include water absorption，dilation，low strength，inferior agglutination，and is apt to plastic deformation；the deformation in roof is the highest；the deformation of roof has differences at different parts；the displacement at deep base point is superior to shallow point；the velocity of displacement curve is faster at the beginning phase and the characteristic of curve shows step in the next period；the evolutionary process of curve keep the same pace in the time and space among the base point；shrinking width of roadway，changing the style of anchorage，enhancing support strength，draining away water and guniting and sealing surrounding rock in time which are helpful to keep surrounding rock stability.