Proc 4th Conf on Ground Control in Mining Morgantown West Virginia, 1985 :50-57
A theoretical evaluation of the impact of horizontal load on shield support capacity is made from a static rigid body analysis of the shield structure. Parameters affecting horizontal support resistance are investigated for a typical two-leg shield design. Horizontal forces acting on a roof support element are found to be both roof-generated and shield-generated. The impact of shield- generated horizontal forces on roof strata is also discussed from a theoretical viewpoint in relation to desired ground control. A technique is described whereby horizontal loading of shield supports can be measured underground. Horizontal load measurements from two different longwall faces were found to be significant, ranging from 20 to 35 pct of measured vertical load.
Proc. 4th Conf. on Ground Control in Mining, Morgantown, West Virginia, 1985, PP. 50-57
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