眼前山铁矿主采区为节理裂隙比较发育的急倾斜厚大矿体，矿岩具有良好的可冒性。
The ore body in main mining area of Yanqianshan iron mine has a structural character of easy-caving due to a dense joint distribution and a high Angle and thick ore-body.
倾斜锚杆加固的节理抗剪强度比垂直锚杆大，提高锚固面积比能显著提高节理抗剪强度。
The shear resistance of bolted joint can be obviously improved by higher ratio of bolt section to bolted joint area and inclined bolt.
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