sphene
... sphen-楔 sphene楔矿；榍石 sphenitite钛辉榍石岩 ...
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矿物楔裂作用 mineral wedging
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简述了板石矿业公司上青矿640主运输平巷在硐口段施工过程中，克服地质条件复杂、多变的现状，采用撞楔超前支架法施工，硐口掘凿获得成功。
The geological condition is complicated and varies often. Using the method of pre-support through hammering wedge, the cave mouth digging work of No. 640 main transportation channel was successful.
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