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昆钢矿山公司王家滩铁矿新竖井净径5.8米,荒径6.4米,用整体浇灌混凝土支护。井筒穿过的岩层为黑色板岩,节理发育不稳固。其硬度系数f,上部约6～8,下部增到8～10。井口部分50米高的一段是用吊罐天井反掘法掘进的。第二段原亦拟用反掘法掘进,但当用吊罐掘天井时。由于垮帮严重,无法继续上掘,被迫改为由上向下的正掘法施工。 由于岩石比较破碎,特别是有一组东西方向的节理很发育,其倾角约70～90度,下部挖空时极易脱落,给安全施工带来极大困难。在井筒上部的施工中曾用过长达3米的金属楔缝式锚杆,但由于楔缝式锚杆只孔底有一个锚固点,不能阻止岩层的逐层剥落,
Kunming Iron and Steel Company Wangjiantan new shaft mine shaft net diameter of 5.8 meters, 6.4 meters waste diameter, with the overall watering concrete support. Rock formation through the rock for the black slate, joint development is not stable. The hardness coefficient f, the upper about 6 to 8, the lower increased to 8 to 10. Part of the wellhead part of 50 meters is the use of anti-digging tank patio tunneling method. The second paragraph of the original intends to use anti-digging tunneling, but when using a hanging pot to dig the patio. Due to serious collapse, unable to continue on the dig, was forced to go down from the digging construction. As the rock is relatively broken, especially in the direction of a group of east-west joints are developed, the dip angle of about 70 to 90 degrees, the lower part of the hollow easily fall off, bringing great difficulties to the safety construction. In the upper part of the wellbore construction has used up to 3 meters of metal wedge-type anchor, but because the wedge-type anchor has only an anchor bottom hole, can not stop the rock layer by layer peeling,