... 任意梯段 rytd 梯段爆破 blasting benches; heading blast 梯段标杆 going rod ...
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heading blast charge 工作面爆破装药
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During the anchoring and shotcreting construction at the rock heading blast advancement face, problems such as support strength can not be guaranteed or engineering quality uneasy to control exist.
岩巷炮掘工作面的锚喷施工存在支护强度得不到保证、工程质量不易控制等问题。
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